@article{MTMT:3362543, title = {A new conceptual model for the genesis of Plio-Pleistocene alkaline basalts in the Pannonian Basin}, url = {https://m2.mtmt.hu/api/publication/3362543}, author = {Kovács, István János and Kiss, János and Török, Kálmán and Király, Edit and Karátson, Dávid and Fancsik, Tamás and Biró, Tamás and Pálos, Zsófia and Aradi, László Előd and Patkó, Levente and Liptai, Nóra and Falus, György and Károly, Hidas and Wesztergom, Viktor and Szabó, Csaba}, journal-iso = {GEOPHYS RES ABSTR}, journal = {GEOPHYSICAL RESEARCH ABSTRACTS}, volume = {20}, unique-id = {3362543}, issn = {1029-7006}, keywords = {Pannonian Basin; geofizika}, year = {2018}, eissn = {1607-7962}, orcid-numbers = {Kovács, István János/0000-0002-3488-3716; Kiss, János/0000-0001-8589-1364; Karátson, Dávid/0000-0003-0386-1239; Biró, Tamás/0000-0001-5198-7210; Aradi, László Előd/0000-0003-0276-3119; Patkó, Levente/0000-0001-6007-3103; Liptai, Nóra/0000-0002-2464-2468; Szabó, Csaba/0000-0002-1580-6344} } @article{MTMT:3323242, title = {Fluid-Enhanced Annealing in the Subcontinental Lithospheric Mantle Beneath the Westernmost Margin of the Carpathian-Pannonian Extensional Basin System}, url = {https://m2.mtmt.hu/api/publication/3323242}, author = {Aradi, László Előd and Hidas, K and Kovács, István János and Tommasi, A and Klébesz, Rita and Garrido, CJ and Szabó, Csaba}, doi = {10.1002/2017TC004702}, journal-iso = {TECTONICS}, journal = {TECTONICS}, volume = {36}, unique-id = {3323242}, issn = {0278-7407}, abstract = {Mantle xenoliths from the Styrian Basin Volcanic Field (Western Pannonian Basin, Austria) are mostly coarse granular amphibole-bearing spinel lherzolites with microstructures attesting for extensive annealing. Olivine and pyroxene CPO (crystal-preferred orientation) preserve nevertheless the record of coeval deformation during a preannealing tectonic event. Olivine shows transitional CPO symmetry from [010]-fiber to orthogonal type. In most samples with [010]-fiber olivine CPO symmetry, the [001] axes of the pyroxenes are also dispersed in the foliation plane. This CPO patterns are consistent with lithospheric deformation accommodated by dislocation creep in a transpressional tectonic regime. The lithospheric mantle deformed most probably during the transpressional phase after the Penninic slab breakoff in the Eastern Alps. The calculated seismic properties of the xenoliths indicate that a significant portion of shear wave splitting delay times in the Styrian Basin (0.5 s out of approximately 1.3 s) may originate in a highly annealed subcontinental lithospheric mantle. Hydroxyl content in olivine is correlated to the degree of annealing, with higher concentrations in the more annealed textures. Based on the correlation between microstructures and hydroxyl content in olivine, we propose that annealing was triggered by percolation of hydrous fluids/melts in the shallow subcontinental lithospheric mantle. A possible source of these fluids/melts is the dehydration of the subducted Penninic slab beneath the Styrian Basin. The studied xenoliths did not record the latest large-scale geodynamic events in the region-the Miocene extension then tectonic inversion of the Pannonian Basin. ©2017. American Geophysical Union.}, keywords = {microstructure; DEFORMATION; annealing; Solvents; MANTLE XENOLITHS; Pannonian Basin; Tectonics; Seismology; Structural geology; Silicate minerals; olivine; geodynamics; Dislocations (crystals); Crystal orientation; shear flow; EBSD; Percolation (fluids); SEISMIC ANISOTROPY; Mantle xenolith; Shear waves; Sub-continental lithospheric mantles; subcontinental lithospheric mantle}, year = {2017}, eissn = {1944-9194}, pages = {2987-3011}, orcid-numbers = {Aradi, László Előd/0000-0003-0276-3119; Kovács, István János/0000-0002-3488-3716; Szabó, Csaba/0000-0002-1580-6344} } @article{MTMT:3288117, title = {Multiple Metasomatism beneath the Nograd-Gomor Volcanic Field (Northern Pannonian Basin) Revealed by Upper Mantle Peridotite Xenoliths}, url = {https://m2.mtmt.hu/api/publication/3288117}, author = {Liptai, Nóra and Patkó, Levente and Kovács, István János and Hidas, K and Pinter, Z and Jeffries, T and Zajacz, Z and O'Reilly, SY and Griffin, WL and Pearson, NJ and Szabó, Csaba}, doi = {10.1093/petrology/egx048}, journal-iso = {J PETROL}, journal = {JOURNAL OF PETROLOGY}, volume = {58}, unique-id = {3288117}, issn = {0022-3530}, year = {2017}, eissn = {1460-2415}, pages = {1107-1144}, orcid-numbers = {Liptai, Nóra/0000-0002-2464-2468; Patkó, Levente/0000-0001-6007-3103; Kovács, István János/0000-0002-3488-3716; Szabó, Csaba/0000-0002-1580-6344} } @article{MTMT:3193611, title = {Water in the upper mantle and deep crust of eastern China: Concentration, distribution and implications}, url = {https://m2.mtmt.hu/api/publication/3193611}, author = {Qun-Ke, Xia and Jia, Liu and Kovács, István János and Yan-Tao, Hao and Pei, Li and Xiao-Zhi, Yang and Huan, Chen and Yin-Min, Sheng}, doi = {10.1093/nsr/nwx016}, journal-iso = {NATL SCI REV}, journal = {NATIONAL SCIENCE REVIEW}, volume = {6}, unique-id = {3193611}, issn = {2095-5138}, year = {2017}, eissn = {2053-714X}, pages = {125-144}, orcid-numbers = {Kovács, István János/0000-0002-3488-3716} } @article{MTMT:3014151, title = {Concentration of hydroxyl defects in quartz from various rhyolitic ignimbrite horizons: Results from unpolarized micro-FTIR analyses on unoriented phenocryst fragments}, url = {https://m2.mtmt.hu/api/publication/3014151}, author = {Biró, Tamás and Kovács, István János and Király, Edit and Falus, György and Karátson, Dávid and Bendő, Zsolt and Fancsik, Tamás and Sándorné, JK}, doi = {10.1127/ejm/2016/0028-2515}, journal-iso = {EUR J MINERAL}, journal = {EUROPEAN JOURNAL OF MINERALOGY}, volume = {28}, unique-id = {3014151}, issn = {0935-1221}, abstract = {Hydroxyl defect concentrations of quartz phenocryst fragments from various rhyolitic pyroclastic density current deposits from the Bükk Foreland Volcanic Area, Hungary, were determined by using micro-FTIR spectrometry. In addition trace-element analysis and SEM cathodoluminescence imaging were performed on the same crystals. Hydroxyl defect-content (expressed in water equivalent) of volcanic quartz ranges from 0.9± 0.1 to 2.8 ± 0.4 wt. ppm, which is lower than those in quartz of plutonic (granitic), metamorphic and hydrothermal origin. The incorporation of hydroxyl defect is mainly due to H++ Al3+ substitutions into Si-tetrahedral vacancies of quartz. Furthermore, the presence of molecular water probably in (nano-)inclusions was proven. The post-eruptive diffusive loss of hydroxyl defects during cooling seems to be the main factor causing the very low concentration of hydroxyl defects. This may be also manifested in the almost homogeneous distribution of hydroxyl defects regardless of the considerable zonation in Al-content, although complete diffusive loss of hydroxyl defects was possibly hindered by the cooling effect of phreatomagmatism (interaction of excess water with magma during eruption) and deposition in a shallow submarine environment. Moreover, a reasonable linear correlation is observed between the integrated area of Si–O bands (between 2110 and 1440 cm1) and sample thickness up to ~300μm by studying unoriented quartz phenocryst fragments. This may enable the quantitative analysis of hydroxyl defects in separated quartz crystals without the need for preparing oriented thin sections.}, keywords = {földtan; kőzettan; geokémia}, year = {2016}, eissn = {1617-4011}, pages = {313-327}, orcid-numbers = {Biró, Tamás/0000-0001-5198-7210; Kovács, István János/0000-0002-3488-3716; Karátson, Dávid/0000-0003-0386-1239} } @article{MTMT:2794064, title = {Origin and geodynamic relationships of the Late Miocene to Quaternary alkaline basalt volcanism in the Pannonian basin, eastern–central Europe}, url = {https://m2.mtmt.hu/api/publication/2794064}, author = {Harangi, Szabolcs and Jankovics, M. Éva and Sági, Tamás and Kiss, Balázs and Haranginé Lukács, Réka and Soós, Ildikó}, doi = {10.1007/s00531-014-1105-7}, journal-iso = {INT J EARTH SCI}, journal = {INTERNATIONAL JOURNAL OF EARTH SCIENCES}, volume = {104}, unique-id = {2794064}, issn = {1437-3254}, keywords = {BASALT; Carpathian-Pannonian region; Spinel; monogenetic volcanic field; Asthenosphere flow; Magma genesis}, year = {2015}, eissn = {1437-3262}, pages = {2007-2032}, orcid-numbers = {Harangi, Szabolcs/0000-0003-2372-4581; Jankovics, M. Éva/0000-0001-7079-4422; Sági, Tamás/0000-0003-4664-5472; Kiss, Balázs/0000-0003-0040-0656; Haranginé Lukács, Réka/0000-0002-2338-4209; Soós, Ildikó/0000-0003-2345-8391} } @article{MTMT:2822202, title = {Constraints on the thickness and seismic properties of the lithosphere in an extensional setting (Nógrád-Gömör Volcanic Field, Northern Pannonian Basin)}, url = {https://m2.mtmt.hu/api/publication/2822202}, author = {Klébesz, Rita and Gráczer, Zoltán and Szanyi, Gyöngyvér and Liptai, Nóra and Kovács, István János and Patkó, Levente and Pintér, Zs and Falus, György and Wesztergom, Viktor and Szabó, Csaba}, doi = {10.1007/s40328-014-0094-0}, journal-iso = {ACTA GEOD GEOPHYS}, journal = {ACTA GEODAETICA ET GEOPHYSICA}, volume = {50}, unique-id = {2822202}, issn = {2213-5812}, keywords = {lithospheric mantle; Moho; SEISMIC ANISOTROPY; Mantle xenolith; LAB; S receiver functions; Northern Pannonian Basin}, year = {2015}, eissn = {2213-5820}, pages = {133-149}, orcid-numbers = {Liptai, Nóra/0000-0002-2464-2468; Kovács, István János/0000-0002-3488-3716; Patkó, Levente/0000-0001-6007-3103; Szabó, Csaba/0000-0002-1580-6344} } @article{MTMT:2932134, title = {Characterization of the sub-continental lithospheric mantle beneath the Cameroon volcanic line inferred from alkaline basalt hosted peridotite xenoliths from Barombi Mbo and Nyos Lakes}, url = {https://m2.mtmt.hu/api/publication/2932134}, author = {Pintér, Z and Patkó, Levente and Tene, Djoukam JF and Kovács, István János and Tchouankoue, JP and Falus, György and Konc, Z and Tommasi, A and Barou, F and Mihály, Judith and Németh, Csaba and Jeffries, T}, doi = {10.1016/j.jafrearsci.2015.07.006}, journal-iso = {J AFR EARTH SCI}, journal = {JOURNAL OF AFRICAN EARTH SCIENCES}, volume = {111}, unique-id = {2932134}, issn = {1464-343X}, abstract = {We carried out detailed petrographic, major and trace element geochemical, microstructural and FTIR analyses on eight characteristic ultramafic xenoliths from Nyos and Barombi Mbo Lakes in the continental sector of the Cameroon Volcanic Line (CVL). The studied xenoliths are spinel lherzolites showing lithologies similar to the other xenoliths reported previously along the CVL. They have protogranular and porphyroclastic textures. One of the Barombi xenolith contains amphibole, which had not been previously reported in this locality. Amphibole is common in the Nyos xenoliths suite. Peridotite xenoliths from both localities show some chemical heterogeneity, but Barombi xenoliths generally are less depleted in basaltic elements with respect to Nyos xenoliths. Trace element compositions of Nyos spinel lherzolites show a moderately depleted initial (premetasomatic) composition and variable enrichment in REE. Evidence for both modal and cryptic metasomatism is present in Nyos xenoliths. Rare earth element patterns of clinopyroxene suggest that interaction between mafic melts and the upper mantle occurred beneath the Nyos locality. Barombi Mbo xenoliths, on the other hand, record a small degree of partial melting. The Barombi Mbo xenoliths have weak, dominantly orthorhombic olivine crystal preferred orientations, whereas Nyos ones have strong axial-[010] patterns, which may have formed in response to transpression. Nominally anhydrous mantle minerals (NAMs) of the Barombi Mbo xenoliths show generally higher bulk concentrations of 'water' (70-127 ppm) than Nyos xenoliths (32-81 ppm). The Barombi Mbo xenoliths could originate from a juvenile segment of the lithospheric mantle, which had been originally part of the asthenosphere. It became a part of the lithosphere in response to thermal relaxation following the extension, forming a weakly deformed lower lithospheric mantle region along the CVL. The Nyos xenoliths, however, represent a shallow lithospheric mantle bearing imprints of several depletion and enrichment events probably prior or following the extension (at ~30 Ma). © 2015.}, keywords = {mantle metasomatism; Ultramafic xenolith; Crystal preferred orientation; Cameroon volcanic line; 'Water' content of nominally anhydrous minerals}, year = {2015}, eissn = {1879-1956}, pages = {170-193}, orcid-numbers = {Patkó, Levente/0000-0001-6007-3103; Kovács, István János/0000-0002-3488-3716} } @CONFERENCE{MTMT:2786083, title = {Combined geophysical (magnetotellurics) and geochemical results for determination of the Lithosphere-Asthenosphere Boundary (LAB) beneath the Nógrád-Gömör Volcanic Field}, url = {https://m2.mtmt.hu/api/publication/2786083}, author = {Novák, Attila and Klébesz, Rita and Szabó, Cs and Wesztergom, Viktor and Patkó, Levente and Liptai, Nóra and Ádám, Antal and Semenov, V Y and Lemperger, István and Kis, Árpád and Gribovszki, Katalin Eszter}, booktitle = {22 nd EM Induction Workshop}, unique-id = {2786083}, year = {2014}, orcid-numbers = {Patkó, Levente/0000-0001-6007-3103; Liptai, Nóra/0000-0002-2464-2468; Gribovszki, Katalin Eszter/0000-0003-2577-0127} } @article{MTMT:2154674, title = {Progradation of the paleo-Danube shelf margin across the Pannonian Basin during the Late Miocene and Early Pliocene}, url = {https://m2.mtmt.hu/api/publication/2154674}, author = {Magyar, Imre and Radivojević, D and Sztanó, Orsolya and Synak, R and Ujszászi, K and Pócsik, M}, doi = {10.1016/j.gloplacha.2012.06.007}, journal-iso = {GLOBAL PLANET CHANGE}, journal = {GLOBAL AND PLANETARY CHANGE}, volume = {103}, unique-id = {2154674}, issn = {0921-8181}, abstract = {The basin of giant Lake Pannon in Central Europe was filled by forward accretion of sediment packages during the Late Miocene and Early Pliocene. Successive positions of the shelf-margin are represented by a series of clinoforms in seismic profiles. The height of the clinoforms (and thus the inferred paleo water depth) is 200-600 m in the successions; the width of the slope, measured from the shelf-break down to the toe of slope, varies between 5 and 15 km. Geographical position of successive shelf-margin slopes indicates that about 2/3 of the basin area was filled by sediment transport systems supplying sediments from the NW, from the Alps and Western Carpathians. The first shelf-margin slope was built by the paleo-Danube in the Kisalföld/Danube sub-basin about 10 Ma ago, and during the subsequent 6 Ma it prograded ca. 400 km to the SE across the Pannonian Basin, with an average of 67 km/Ma slope advance. The most significant agent of this shelf growth was the sediment dispersal system of the paleo-Danube, hence we designate this northwestern shelf the paleo-Danube shelf. The northeastern part of Lake Pannon was filled by the paleo-Tisza system, supplying sediments from the Northeastern and Eastern Carpathians. Additional local systems carried sediments from E to W along the eastern margin and S to N along the southern margin of the Pannonian Basin, respectively. The deep-water environment disappeared from the Pannonian Basin and the endemic, brackish biota of Lake Pannon went extinct probably 4 Ma ago, when the paleo-Danube shelf margin and a (yet unidentified) shelf margin prograding in the opposite direction met in the southeastern corner of the Pannonian Basin. © 2012 Elsevier B.V. All rights reserved.}, keywords = {Pannonian Basin; Lake Pannon; Progradation; Shelf-margin; Paleo-Danube; Clinoform}, year = {2013}, eissn = {1872-6364}, pages = {168-173}, orcid-numbers = {Sztanó, Orsolya/0000-0003-0786-3653} } @CONFERENCE{MTMT:3119686, title = {Wehrlitization processes within the upper mantle beneath the Northern Pannonian basin (Hungary).}, url = {https://m2.mtmt.hu/api/publication/3119686}, author = {Patkó, Levente and Aradi, László Előd and Liptai, Nóra and Bodnar, R J and Fedele, L and Kovács, Zoltán and Cesare, B and Vaselli, O and Fioretti, A M and Jeffries, T and Szabó, Cs}, booktitle = {2013 Goldschmidt Conference}, unique-id = {3119686}, year = {2013}, pages = {1934-1934}, orcid-numbers = {Patkó, Levente/0000-0001-6007-3103; Aradi, László Előd/0000-0003-0276-3119; Liptai, Nóra/0000-0002-2464-2468} } @article{MTMT:2820653, title = {High water content in Mesozoic primitive basalts of the North China Craton and implications for the destruction of cratonic mantle lithosphere.}, url = {https://m2.mtmt.hu/api/publication/2820653}, author = {Xia, Q and Liu, J and Liu, S C and Kovács, István János and Feng, M and Dang, L}, doi = {10.1016/j.epsl.2012.11.024}, journal-iso = {EARTH PLANET SC LETT}, journal = {EARTH AND PLANETARY SCIENCE LETTERS}, volume = {361}, unique-id = {2820653}, issn = {0012-821X}, year = {2013}, eissn = {1385-013X}, pages = {85-97}, orcid-numbers = {Kovács, István János/0000-0002-3488-3716} } @article{MTMT:2202613, title = {An experimental study of water in nominally anhydrous minerals in the upper mantle near the water-saturated solidus}, url = {https://m2.mtmt.hu/api/publication/2202613}, author = {Kovács, István János and Green, H D and Rosenthal, A and Hermann, J and O’Neill, H St C and Hibberson, W O and Udvardi, Beatrix}, doi = {10.1093/petrology/egs044}, journal-iso = {J PETROL}, journal = {JOURNAL OF PETROLOGY}, volume = {53}, unique-id = {2202613}, issn = {0022-3530}, year = {2012}, eissn = {1460-2415}, pages = {2067-2093}, orcid-numbers = {Kovács, István János/0000-0002-3488-3716} } @article{MTMT:1887382, title = {Seismic anisotropy and deformation patterns in upper mantle xenoliths from the central Carpathian-Pannonian region: Asthenospheric flow as a driving force for Cenozoic extension and extrusion?}, url = {https://m2.mtmt.hu/api/publication/1887382}, author = {Kovács, István János and Falus, György and Stuart, G and Hidas, K and Szabó, Csaba and Flower, MFJ and Hegedűs, Endre and Posgay, Károly and Zilahi-Sebess, László József}, doi = {10.1016/j.tecto.2011.10.022}, journal-iso = {TECTONOPHYSICS}, journal = {TECTONOPHYSICS}, volume = {514-517}, unique-id = {1887382}, issn = {0040-1951}, abstract = {We review deformation fabrics in mantle xenoliths from the central part of the Carpathian-Pannonian Region (CPR) and, in combination with seismic shear wave splitting data, attempt to define patterns of upper mantle anisotropy. Our interpretations from both lines of evidence support a model for east-west oriented asthenospheric flow, decoupled (at least in part) from the overlying lithosphere. Mantle flow fields resulting from Tertiary indentation of Europe by the Adria micro-plate and the resulting Alpine orogen may thus have been an important factor in driving the eastward extrusion of lithospheric blocks in the CPR accompanied by lithospheric extension, rapid 'rollback' of the Carpathian subduction system, and its diachronous collision with the European craton. According to this model, eastward asthenospheric flow would add significantly to the effects of slab rollback and gravitational instability. Thus, opening of the Pannonian Basin, rather than being exclusively driven by 'slab pull' and gravitational instability, could have been resulted, at least in part, from mantle flow associated with the Adria-European collision and ensuing Alpine orogeny. Such models have also been proposed for analogous geodynamic scenarios such as the western and eastern Mediterranean, and western and southwestern Pacific regions, offering a potential generic model for backarc basin opening. (C) 2011 Elsevier B.V. All rights reserved.}, year = {2012}, eissn = {1879-3266}, pages = {168-179}, orcid-numbers = {Kovács, István János/0000-0002-3488-3716; Szabó, Csaba/0000-0002-1580-6344} } @article{MTMT:1887375, title = {Water and its influence on the lithosphere-asthenosphere boundary}, url = {https://m2.mtmt.hu/api/publication/1887375}, author = {Green, DH and Hibberson, WO and Kovács, István János and Rosenthal, A}, doi = {10.1038/nature09369}, journal-iso = {NATURE}, journal = {NATURE}, volume = {467}, unique-id = {1887375}, issn = {0028-0836}, abstract = {The Earth has distinctive convective behaviour, described by the plate tectonics model, in which lateral motion of the oceanic lithosphere of basaltic crust and peridotitic uppermost mantle is decoupled from the underlying mechanically weaker upper mantle (asthenosphere). The reason for differentiation at the lithosphere-asthenosphere boundary is currently being debated with relevant observations from geophysics (including seismology) and geo-chemistry (including experimental petrology). Water is thought to have an important effect on mantle rheology, either by weakening the crystal structure of olivine and pyroxenes by dilute solid solution(1), or by causing low-temperature partial melting(2). Here we present a novel experimental approach to clarify the role of water in the uppermost mantle at pressures up to 6 GPa, equivalent to a depth of 190 km. We found that for lherzolite in which a water-rich vapour is present, the temperature at which a silicate melt first appears (the vapour-saturated solidus) increases from a minimum of 970 degrees C at 1.5 GPa to 1,350 degrees C at 6 GPa. We have measured the water content in lherzolite to be approximately 180 parts per million, retained in nominally anhydrous minerals at 2.5 and 4 GPa at temperatures above and below the vapour-saturated solidus. The hydrous mineral pargasite is the main water-storage site in the uppermost mantle, and the instability of pargasite at pressures greater than 3 GPa (equivalent to more than about 90 km depth) causes a sharp drop in both the water-storage capacity and the solidus temperature of fertile upper-mantle lherzolite. The presence of interstitial melt in mantle with more than 180 parts per million of water at pressures greater than 3 GPa alters mantle rheology and defines the lithosphere-asthenosphere boundary. Modern asthenospheric mantle acting as the source for mid-oceanic ridge basalts has a water content of 50-200 parts per million (refs 3-5). We show that this matches the water content of residual nominally anhydrous minerals after incipient melting of lherzolite at the vapour-saturated solidus at high pressure.}, year = {2010}, eissn = {1476-4687}, pages = {448-451}, orcid-numbers = {Kovács, István János/0000-0002-3488-3716} } @article{MTMT:1615233, title = {Coexisting silicate melt inclusions and H2O-bearing, CO2-rich fluid inclusions in mantle peridotite xenoliths from the Carpathian-Pannonian region (central Hungary)}, url = {https://m2.mtmt.hu/api/publication/1615233}, author = {Hidas, Károly János and Guzmics, Tibor and Szabó, Csaba and Kovács, István János and Bodnar, RJ and Zajacz, Zoltán and Nédli, Zsuzsanna and Vaccari, L and Perucchi, A}, doi = {10.1016/j.chemgeo.2010.03.004}, journal-iso = {CHEM GEOL}, journal = {CHEMICAL GEOLOGY}, volume = {274}, unique-id = {1615233}, issn = {0009-2541}, keywords = {trace element; Hungary; carpathians; Silicate melt inclusions; silicate melt; melt inclusion; Carpathian-Pannonian region; xenolith; fluid inclusion; peridotite; Peridotite xenoliths; Isotopic composition; FTIR spectroscopy; C-O-H-S fluid inclusions; lherzolite; CLINOPYROXENE; P-T conditions; volatile element; immiscibility; Volatile (fluid)-silicate melt immiscibility}, year = {2010}, eissn = {1872-6836}, pages = {1-18}, orcid-numbers = {Guzmics, Tibor/0000-0002-9060-3774; Szabó, Csaba/0000-0002-1580-6344; Kovács, István János/0000-0002-3488-3716} } @article{MTMT:2820621, title = {Site-specific infrared O-H absorption coefficients for water substitution into olivine}, url = {https://m2.mtmt.hu/api/publication/2820621}, author = {Kovács, István János and O’Neill, H St C and Hermann, J and Hauri, E}, doi = {10.2138/am.2010.3313}, journal-iso = {AM MINERAL}, journal = {AMERICAN MINERALOGIST}, volume = {95}, unique-id = {2820621}, issn = {0003-004X}, abstract = {There are four ways by which OH− commonly substitutes into olivine, namely those associated with (1) Si vacancies, (2) Mg vacancies, (3) Ti, or (4) trivalent cations. The four mechanisms, which we label [Si], [Mg], [Ti], and [triv], respectively, may each be fingerprinted by their characteristic O-H stretching modes in the infrared spectrum. We show by comparing the integrated intensities of these characteristic infrared peaks against total water content analyzed by secondary ion mass spectrometry, obtained for a suite of synthetic olivines plus one natural olivine, that the different substitution mechanisms require different absorption coefficients (k). For [Ti], we find k = 0.18 ± 0.07, identical to the value previously obtained from natural olivines in which the water was mainly associated with [Ti] defects. Values of k for [Si] and [triv] are 0.57 ± 0.04 and 0.18 ± 0.05, respectively; that for [Mg] is too small to be accurately determined (0.03 ± 0.03). The values of k for [Ti] and [Si] defects differ by a factor of three even though their average wavenumbers are virtually the same. The [Ti] and [triv] defects, on the other hand, have very similar absorption coefficients at significantly different wavenumbers. This highlights the inadequacy of using wavenumber-dependent calibrations for olivine and presumably for NAMs in general. Different substitution mechanisms have their own crystallographic environments that determine their absorption coefficients. The large variation in absorption coefficients within a single mineral emphasizes the importance of distinguishing the substitution mechanism if meaningful quantitative results are to be obtained from infrared spectroscopy.}, year = {2010}, eissn = {1945-3027}, pages = {292-299}, orcid-numbers = {Kovács, István János/0000-0002-3488-3716} } @article{MTMT:1384579, title = {Neogene-quaternary volcanic forms in the Carpathian-Pannonian region: A review}, url = {https://m2.mtmt.hu/api/publication/1384579}, author = {Lexa, J and Seghedi, I and Németh, Károly and Szakács, A and Konečný, V and Pécskay, Zoltán and Fülöp, A and Kovacs, M}, doi = {10.2478/v10085-010-0024-5}, journal-iso = {CENT EUR J GEOSCI}, journal = {CENTRAL EUROPEAN JOURNAL OF GEOSCIENCES}, volume = {2}, unique-id = {1384579}, issn = {2081-9900}, abstract = {Neogene to Quaternary volcanic/magmatic activity in the Carpathian-Pannonian Region (CPR) occurred between 21 and 0.1 Ma with a distinct migration in time from west to east. It shows a diverse compositional variation in response to a complex interplay of subduction with roll-back, back-arc extension, collision, slab break-off, delamination, strike-slip tectonics and microplate rotations, as well as in response to further evolution of magmas in the crustal environment by processes of differentiation, crustal contamination, anatexis and magma mixing. Since most of the primary volcanic forms have been affected by erosion, especially in areas of post-volcanic uplift, based on the level of erosion we distinguish: (1) areas eroded to the basement level, where paleovolcanic reconstruction is not possible; (2) deeply eroded volcanic forms with secondary morphology and possible paleovolcanic reconstruction; (3) eroded volcanic forms with remnants of original morphology preserved; and (4) the least eroded volcanic forms with original morphology quite well preserved. The large variety of volcanic forms present in the area can be grouped in a) monogenetic volcanoes and b) polygenetic volcanoes and their subsurface/intrusive counterparts that belong to various rock series found in the CPR such as calc-alkaline magmatic rock-types (felsic, intermediate and mafic varieties) and alkalic types including K-alkalic, shoshonitic, ultrapotassic and Na-alkalic. The following volcanic/subvolcanic forms have been identified: (i) domes, shield volcanoes, effusive cones, pyroclastic cones, stratovolcanoes and calderas with associated intrusive bodies for intermediate and basic calc-alkaline volcanism; (ii) domes, calderas and ignimbrite/ash-flow fields for felsic calc-alkaline volcanism and (iii) dome flows, shield volcanoes, maars, tuffcone/tuff-rings, scoria-cones with or without related lava flow/field and their erosional or subsurface forms (necks/ plugs, dykes, shallow intrusions, diatreme, lava lake) for various types of K- and Na-alkalic and ultrapotassic magmatism. Finally, we provide a summary of the eruptive history and distribution of volcanic forms in the CPR using several sub-region schemes.}, keywords = {Pannonian Basin; carpathians; volcanoes; volcanic forms; rhyolite; Quaternary; Neogene; dacites; andesites; alkali basalts}, year = {2010}, eissn = {1896-1517}, pages = {207-270} } @article{MTMT:1372462, title = {Detection of small amounts of H2O in CO2-rich fluid inclusions using Raman spectroscopy}, url = {https://m2.mtmt.hu/api/publication/1372462}, author = {Berkesi, Márta and Hidas, Károly János and Guzmics, Tibor and Dubessy, J and Bodnar, R J and Szabó, Csaba and Vajna, B and Tsunogae, T}, doi = {10.1002/jrs.2440}, journal-iso = {J RAMAN SPECTROSC}, journal = {JOURNAL OF RAMAN SPECTROSCOPY}, volume = {40}, unique-id = {1372462}, issn = {0377-0486}, abstract = {Raman spectroscopic analysis at low (−100 ◦C) or high (100–200 ◦C) temperature is shown to be effective for detecting small amounts of H2O in CO2-rich fluid inclusions from the deep lithosphere, which have previously been thought to be water-free.}, year = {2009}, eissn = {1097-4555}, pages = {1461-1463}, orcid-numbers = {Berkesi, Márta/0000-0003-4380-057X; Guzmics, Tibor/0000-0002-9060-3774; Szabó, Csaba/0000-0002-1580-6344} } @article{MTMT:1887373, title = {Seismic properties of anita bay dunite: An exploratory study of the influence of water}, url = {https://m2.mtmt.hu/api/publication/1887373}, author = {Aizawa, Y and Barnhoorn, A and Faul, UH and Fitz, Gerald JD and Jackson, I and Kovács, István János}, doi = {10.1093/petrology/egn007}, journal-iso = {J PETROL}, journal = {JOURNAL OF PETROLOGY}, volume = {49}, unique-id = {1887373}, issn = {0022-3530}, abstract = {As a pilot study of the role of water in the attenuation of seismic waves in the Earth's upper mantle, we have performed a series of seismic-frequency torsional forced-oscillation experiments on a natural ( Anita Bay) dunite containing accessory hydrous phases, at high temperatures to 1300 degrees C and confining pressure ( P-c) of 200 MPa, within a gas-medium high-pressure apparatus. Both oven-dried and pre-fired specimens wrapped in Ni-Fe foil within the ( poorly) vented assembly were recovered essentially dry after 50-100 h of annealing at 1300 degrees C followed by slow staged cooling. The results for those specimens indicate broadly similar absorption-band viscoelastic behaviour, but with systematic differences in the frequency dependence of strain-energy dissipation Q(-1), attributed to differences in the small volume fraction of silicate melt and its spatial distribution. In contrast, it has been demonstrated that a new assembly involving a welded Pt capsule retains aqueous fluid during prolonged exposure to high temperatures allowing the first high-temperature torsional forced-oscillation measurements under high aqueous fluid pore pressure P-f. At temperatures>1000 degrees C, a marked reduction in shear modulus, without concomitant increase in Q(-1), is attributed to the widespread wetting of grain boundaries resulting from grain-scale hydrofracturing and the maintenance of conditions of low differential pressure P-d=P-c-P-f. Staged cooling from 1000 degrees C is accompanied by decreasing Pf and progressive restoration of significantly positive differential pressure resulting in a microstructural regime in which the fluid on grain boundaries is increasingly restricted to arrays of pores. The more pronounced viscoelastic behaviour observed within this regime for the Pt-encapsulated specimen compared with the essentially dry specimens may reflect both water-enhanced solid-state relaxation and the direct influence of the fluid phase. The scenario of overpressurized fluids and hydrofracturing in the Pt-encapsulated dunite specimen may have some relevance to the high Q(-1) and low-velocity zones observed in subduction-zone environments. The outcomes of this exploratory study indicate that the presence of water can have a significant effect on the seismic wave attenuation in the upper mantle and provide the foundation for more detailed studies on the role of water.}, year = {2008}, eissn = {1460-2415}, pages = {841-855}, orcid-numbers = {Kovács, István János/0000-0002-3488-3716} } @article{MTMT:2269135, title = {Deformation and seismic anisotropy of the lithospheric mantle in the southeastern Carpathians inferred from the study of mantle xenoliths}, url = {https://m2.mtmt.hu/api/publication/2269135}, author = {Falus, György and Tommasi, A and Ingrin, J and Szabó, Csaba}, doi = {10.1016/j.epsl.2008.04.035}, journal-iso = {EARTH PLANET SC LETT}, journal = {EARTH AND PLANETARY SCIENCE LETTERS}, volume = {272}, unique-id = {2269135}, issn = {0012-821X}, abstract = {Peridotite xenoliths with a broad range of textures provides evidence for consistent microstructural evolution in a vertical transect of the shallow lithospheric mantle (35-55 km depth) beneath the Persani Mountains, SE Carpathians, Romania, due to Ongoing plate convergence in the Carpathian Arc nearby. The recrystallized grain size, crystal preferred orientations Strength, and resulting seismic anisotropy vary Continuously and display a Strong correlation to equilibrium temperatures, suggesting a continuous change in deformation conditions with depth. The shallowmost xenoliths have microstructures typical of high stress deformation, marked by strong recrystallization to fine grain sizes, which results in weak crystal preferred orientations and anisotropy. The deepest xenoliths have coarse-grained porphyroclastic microstructures and strong crystal preferred orientations. Replacive orthopyroxene structures, consuming olivine, and high H(2)O concentrations in the pyroxenes are observed in some xenoliths indicating limited percolation of fluids or volatile-rich melts. Despite the high stress deformation and high H(2)O contents in some of the studied xenoliths, analysis of olivine crystallographic orientations indicates that 11001 slip systems rather than "wet", [001] accommodate most of the deformation in all samples. Seismic anisotropy estimated from the measured olivine and pyroxene crystal preferred orientations suggests that the strike-parallel fast SKS polarization directions and similar to 1 s delay times measured in the SE Carpathians are likely the consequence of convergence-driven belt-parallel flow in the lithospheric mantle. (C) 2008 Elsevier B.V. All Fights reserved.}, keywords = {WATER; DEFORMATION; Anisotropy; SUBDUCTION; MANTLE XENOLITHS; plate convergence; olivine; Peridotite xenoliths; collision; Microstructures; SUB-ARC MANTLE; ORTHO-PYROXENE; SR-ND ISOTOPE; STRUCTURE BENEATH; Recrystallisation; SLAB DETACHMENT; PANNONIAN REGION; ROMANIAN CARPATHIANS; crystal preferred orientations; SE Carpathians}, year = {2008}, eissn = {1385-013X}, pages = {50-64}, orcid-numbers = {Szabó, Csaba/0000-0002-1580-6344} } @article{MTMT:1452387, title = {Quantitative absorbance spectroscopy with unpolarized light, Part II. Experimental evaluation and development of a protocol for quantitative analysis of mineral IR spectra}, url = {https://m2.mtmt.hu/api/publication/1452387}, author = {Kovács, István János and Hermann, J and O'Neill, H S and Fitz, Gerald J and Sambridge, M and Horváth, Gábor}, doi = {10.2138/am.2008.2656}, journal-iso = {AM MINERAL}, journal = {AMERICAN MINERALOGIST}, volume = {93}, unique-id = {1452387}, issn = {0003-004X}, keywords = {POLARIZATION; infrared spectroscopy; mineralogy; olivine; Calcite; Absorbance; nominally anhydrous minerals; topaz; unpolarized light; absorbance spectroscopy}, year = {2008}, eissn = {1945-3027}, pages = {765-778}, orcid-numbers = {Kovács, István János/0000-0002-3488-3716} } @article{MTMT:1887374, title = {Middle Miocene volcanism in the vicinity of the Middle Hungarian zone: Evidence for an inherited enriched mantle source}, url = {https://m2.mtmt.hu/api/publication/1887374}, author = {Kovács, István János and Szabó, Csaba}, doi = {10.1016/j.jog.2007.06.002}, journal-iso = {J GEODYN}, journal = {JOURNAL OF GEODYNAMICS}, volume = {45}, unique-id = {1887374}, issn = {0264-3707}, abstract = {Middle Miocene igneous rocks in the vicinity of the Middle Hungarian zone (MHZ) show a number of subduction-related geochemical characteristics. Many of these characteristics appear to be time-integrated, showing a decreasing subduction signature with time. In contrast to previous models, which suggest southward-dipping subduction of European lithosphere beneath the Alcapa microplate (along the Western Carpathians) is responsible for the chemical characteristics seen in middle Miocene volcanics, we propose that source enrichment occurred via the subduction of either the Budva-Pindos or Vardar Oceans. Recent seismic studies have revealed that the proposed southward-dipping subduction was not developed beneath the entire Western Carpathians or, even if it had, was overprinted by the collision of the European plate and the Alcapa unit at 16 Ma. This subduction is thought to have started 30 Ma ago, therefore the time between the onset of subduction and collision cannot account for extensive source enrichment in the overlying mantle wedge. It is also pertinent to note that the middle Miocene igneous rocks of the MHZ in their reconstructed positions are not parallel to the supposed suture expected for subduction-related arc volcanoes. Our review suggests an alternative hypothesis, whereby source enrichment is related to the subduction of either the Budva-Pindos or Vardar Ocean during the Mesozoic-Paleogene. In this model the Alcapa microplate was transferred to its present tectonic position via extrusion and rotations. Geophysical modeling and mantle xenoliths provide evidence that this process occurred at the scale of the lithospheric mantle, indicating that the subduction-modified lithospheric mantle was coupled to the crust. Melting in the lithospheric mantle of the Alcapa unit was triggered by the extension during the formation of the Pannonian Basin. The preserved subduction-related geochemical character of volcanics in intra-plate settings that are otherwise directly unaffected by subduction, can be attributed to tectonic transport of metasomatised mantle from a previous subduction-affected setting. This model provides an alternative approach to understanding the geochemical complexity seen among intra-plate calc-alkaline volcanics, where chemical characteristics can be explained without the involvement of plumes. (C) 2007 Elsevier Ltd. All rights reserved.}, year = {2008}, pages = {1-17}, orcid-numbers = {Kovács, István János/0000-0002-3488-3716; Szabó, Csaba/0000-0002-1580-6344} } @article{MTMT:2030783, title = {Quantitative absorbance spectroscopy with unpolarized light: Part I. Physical and mathematical development}, url = {https://m2.mtmt.hu/api/publication/2030783}, author = {Sambridge, M and Gerald, JF and Kovács, István János and O'Neill, HStC and Hermann, J}, doi = {10.2138/am.2008.2657}, journal-iso = {AM MINERAL}, journal = {AMERICAN MINERALOGIST}, volume = {93}, unique-id = {2030783}, issn = {0003-004X}, abstract = {A new approach to the use of spectroscopic absorbance measurements for anisotropic crystals allows results to be extracted using unpolarized light incident on random crystal orientations. The theory of light propagation in anisotropic absorbing crystals is developed from Maxwell's equations to devise an expression for the transmittance of linearly polarized light traveling in an arbitrary direction in weakly absorbing media. This theory predicts the distribution of transmittance and absorbance as a function of direction and polarization angle of incident light. It is shown how a previously deduced empirical expression, commonly used in infrared spectroscopy, is a good approximation to the full theory under a wide range of conditions. The new theory shows that principal polarized absorbances correspond to the eigenvalues of an absorbance ellipsoid. An expression is derived for the unpolarized absorbance as a function of the angles describing incident light direction, A unpol(φ, ψ), and the principal polarized absorbances, A a, A b, A c in an anisotropic crystal. A unpol(φ,ψ) = 1/2[A a(cos 2φcos 2ψ + sin 2ψ) + A b(cos 2φsin 2ψ + cos 2ψ) + A csin 2φ]. Integration of this expression over all incident angles leads to a simple relationship between total measured unpolarized absorbance and the three principal polarized absorbances. Using this theory, a procedure is proposed for estimating both total (A a + A b + A c) and principal absorbances from spectroscopic measurements of absorbance using unpolarized light on a set of randomly oriented crystals.}, keywords = {SPECTROSCOPY; light; quantitative analysis; POLARIZATION; crystal structure; infrared spectroscopy; Atomic absorption spectroscopy; Absorbance; unpolarized light; transmittance; anisotropic medium; Anisotropic media; Absorption index theory}, year = {2008}, eissn = {1945-3027}, pages = {751-764}, orcid-numbers = {Kovács, István János/0000-0002-3488-3716} } @article{MTMT:1884823, title = {Evolution of mafic alkaline melts in the uppermost lithospheric mantle: a melt inclusion study of olivine clinopyroxenite xenoliths, northern Hungary}, url = {https://m2.mtmt.hu/api/publication/1884823}, author = {Zajacz, Z and Kovács, István János and Szabó, Csaba and Halter, W and Pettke, T}, doi = {10.1093/petrology/egm004}, journal-iso = {J PETROL}, journal = {JOURNAL OF PETROLOGY}, volume = {48}, unique-id = {1884823}, issn = {0022-3530}, keywords = {Europe; Hungary; Eurasia; Central Europe; CRYSTALLIZATION; Pannonian Basin; Alkali basalt; mafic rock; Silicate melt inclusions; alkaline rock; silicate melt; melt inclusion; Geochemistry; xenolith; olivine; petrogenesis; igneous geochemistry; lithospheric structure; Upper mantle; CLINOPYROXENE; Nógrád-Gömör Volcanic Field}, year = {2007}, eissn = {1460-2415}, pages = {853-883}, orcid-numbers = {Kovács, István János/0000-0002-3488-3716; Szabó, Csaba/0000-0002-1580-6344} } @article{MTMT:1155705, title = {Geochronology of Neogene magmatism in the Carpathian arc and intra-Carpathian area: a review.}, url = {https://m2.mtmt.hu/api/publication/1155705}, author = {Pécskay, Zoltán and Lexa, J and Szakács, A and Seghedi, I and Balogh, Kadosa and Konečný, V and Zelenka, T and Kovacs, M and Póka, Teréz and Fülöp, A and Márton Péterné Szalay, Emőke and Panaiotu, C and Cvetković, V}, journal-iso = {GEOL CARPATH}, journal = {GEOLOGICA CARPATHICA}, volume = {57}, unique-id = {1155705}, issn = {1335-0552}, abstract = {Neogene to Quaternary volcanism in the Carpathian-Pannonian Region was related to the youngest evolutionary stage of the Carpathian arc and the intra-Carpathian area, with subduction, extension and asthenospheric upwelling as the main driving mechanisms. Volcanism occurred between 21 and 0.1 Ma, and showed a distinct migration in time from West to East. Several groups of calc-alkaline magmatic rock-types (felsic, intermediate and mafic varieties) have been distinguished, and several minor alkalic types also occur, including shoshonitic, K-trachytic, ultrapotassic and alkali basaltic. On the basis of spatial distribution, relationship to tectonic processes and their chemical composition, the volcanic formations can be divided into: (1) areally distributed felsic talc-alkaline formations related to the initial stages of back-arc extension, (2) areally distributed intermediate calc-alkaline formations related to advanced stages of back-arc extension, (3) "arc-type" andesite volcanic formations with a complex relationship to subduction processes, and (4) alkali basaltic magmatism related to post-convergence extension. Petrological data and geotectonic reconstructions, which involve these magmatic groups, place significant constraints on geodynamic models of the Carpathian-Pannonian area. Subduction and back-arc extension were not contemporaneous across the whole Carpathian arc and intra-Carpathian area. Instead, three major geographical segments can be defined (Western, Central, Eastern segments) with a progressively younger timing of subduction roll-back and back-arc extension: 21-11 Ma, 16-9 Ma, 14-0 Ma, respectively. Short-lived subduction-related volcanic activity can be interpreted as either an indication of a limited width of subducted crust (not greater than 200 km) or an indication of detachment of the sinking slab. Interpretation of the areally distributed felsic and intermediate calc-alkaline volcanic formations are considered as being initiated by back-arc extension induced by diapiric uprise of "fertile" asthenospheric material.}, year = {2006}, eissn = {1336-8052}, pages = {511-530}, orcid-numbers = {Márton Péterné Szalay, Emőke/0000-0002-2135-8867} } @article{MTMT:1236932, title = {Mesozoic plate tectonic reconstruction of the carpathian region}, url = {https://m2.mtmt.hu/api/publication/1236932}, author = {Csontos, L and Vörös, Attila}, doi = {10.1016/j.palaeo.2004.02.033}, journal-iso = {PALAEOGEOGR PALAEOCL}, journal = {PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY}, volume = {210}, unique-id = {1236932}, issn = {0031-0182}, abstract = {Palaeomagnetic, palaeobiogeographic and structural comparisons of different parts of the Alpine-Carpathian region suggest that four terranes comprise this area: the Alcapa, Tisza, Dacia and Adria terranes. These terranes are composed of different Mesozoic continental and oceanic fragments that were each assembled during a complex Late Jurassic-Cretaceous Palaeogene history. Palaeomagnetic and tectonic data suggest that the Carpathians are built up by two major oroclinal bends. The Alcapa bend has the Meliata oceanic unit, correlated with the Dinaric Vardar ophiolite, in its core. It is composed of the Western Carpathians, Eastern Alps and Southern Alcapa units (Transdanubian Range, Bukk). This terrane finds its continuation in the High Karst margin of the Dinarides. Further elements of the Alcapa terrane are thought to be derived from collided microcontinents: Czorsztyn in the N and a carbonate unit (Tisza?) in the SE. The Tisza-Dacia bend has the Vardar oceanic unit in its core. It is composed of the Bihor and Getic microcontinents. This terrane finds its continuation in the Serbo-Macedonian Massif of the Balkans. The Bihor-Getic microcontinent originally laid east of the Western Carpathians and filled the present Carpathian embayment in the Late Palaeozoic-Early Mesozoic. The Vardar ocean occupied an intermediate position between the Western Carpathian-Austroalpine-Transdanubian-High Karst margin and the Bihor-Getic-Serbo-Macedonian microcontinent. The Vardar and Pindos oceans were opened in the heart of the Mediterranean-Adriatic microcontinent in the Late Permian-Middle Triassic. Vardar subducted by the end of Jurassic, causing the Bihor-Getic-Serbo-Macedonian microcontinent to collide with the internal Dinaric-Western Carpathian margin. An external Penninic-Vahic ocean tract began opening in the Early Jurassic, separating the Austroalpine-Western Carpathian microcontinent (and its fauna) from the European shelf. Further east, the Severin-Ceahlau-Magura also began opening in the Early Jurassic, but final separation of the Bihor-Getic ribbon (and its fauna) from the European shelf did not take place until the late Middle Jurassic. The Alcapa and the Tisza-Dacia were bending during the Albian-Maastrichtian. The two oroclinal bends were finally opposed and pushed into the gates of the Carpathian embayment during the Palaeogene and Neogene. At that time, the main NS shortening in distant Alpine and Hellenic sectors was linked by a broader right-lateral shear zone along the former Vardar suture. (C) 2004 Elsevier B.V. All rights reserved.}, year = {2004}, eissn = {1872-616X}, pages = {1-56} } @article{MTMT:1883941, title = {Type-II xenoliths and related metasomatism from the Nógrád-Gömör Volcanic Field, Carpathian-Pannonian region (northern Hungary-southern Slovakia)}, url = {https://m2.mtmt.hu/api/publication/1883941}, author = {Kovács, István János and Zajacz, Z and Szabó, Csaba}, doi = {10.1016/j.tecto.2004.07.032}, journal-iso = {TECTONOPHYSICS}, journal = {TECTONOPHYSICS}, volume = {393}, unique-id = {1883941}, issn = {0040-1951}, keywords = {Europe; World; Eastern Hemisphere; Eurasia; PLEISTOCENE; Pannonian Basin; Pliocene; subduction zone; Carpathian-Pannonian region; xenolith; metasomatism; mantle chemistry; Carpathian Basin; trace element geochemistry; underplating; Cumulate xenolith; Nógrád-Gömör Volcanic Field}, year = {2004}, eissn = {1879-3266}, pages = {139-161}, orcid-numbers = {Kovács, István János/0000-0002-3488-3716; Szabó, Csaba/0000-0002-1580-6344} } @article{MTMT:1507563, title = {Post-collisional Tertiary-Quaternary mafic alkalic magmatism in the Carpathian-Pannonian region: a review}, url = {https://m2.mtmt.hu/api/publication/1507563}, author = {Seghedi, I and Downes, H and Vaselli, O and Szakacs, A and Balogh, Kadosa and Pécskay, Zoltán}, doi = {10.1016/j.tecto.2004.07.051}, journal-iso = {TECTONOPHYSICS}, journal = {TECTONOPHYSICS}, volume = {393}, unique-id = {1507563}, issn = {0040-1951}, abstract = {Mafic alkalic volcanism was widespread in the Carpathian-Pannonian region (CPR) between 11 and 0.2 Ma. It followed the Miocene continental collision of the Alcapa and Tisia blocks with the European plate, as subduction-related calc-alkaline magmatism was waning. Several groups of mafic alkalic rocks from different regions within the CPR have been distinguished oil the basis of ages and/or trace-element compositions. Their trace element and Sr-Nd-Pb isotope systematics are consistent with derivation from complex mantle-source regions, which included both depleted asthenosphere and metasomatized lithosphere. The mixing of DMM-HIMU-EMII mantle components within asthenosphere-derived magmas indicates variable contamination of the shallow asthenosphere and/or thermal boundary layer of the lithosphere by a HIMU-Iike component prior to and following the introduction of subduction components. Various mantle sources have been identified: Lower lithospheric mantle modified by several ancient asthenospheric enrichments (source A); Young asthenospheric plumes with OIB-like trace element signatures that are either isotopically enriched (source B) or variably depleted (source Q; Old upper asthenosphere heterogeneously contaminated by DM-HIMU-EMII-EMI components and slightly influenced by Miocene subduction-related enrichment (source D); Old upper asthenosphere heterogeneously contaminated by DM-HIMU-EMII components and significantly influenced by Miocene subduction-related enrichment (source E). Melt generation was initiated either by: (i) finger-like young asthenospheric plumes rising to and heating up the base of the lithosphere (below the Alcapa block), or (ii) decompressional melting of old asthenosphere upwelling to replace any lower lithosphere or heating and melting former subducted slabs (the Tisia block). (C) 2004 Published by Elsevier B.V.}, year = {2004}, eissn = {1879-3266}, pages = {43-62} } @article{MTMT:1855098, title = {Almandine garnet in calc-alkaline volcanic rocks of the Northern Pannonian Basin (Eastern-Central Europe): geochemistry, petrogenesis and geodynamic implications.}, url = {https://m2.mtmt.hu/api/publication/1855098}, author = {Harangi, Szabolcs and Downes, H and Kósa, L and Szabó, Csaba and Thirlwall, M F and Mason, P R D and Mattey, D}, doi = {10.1093/petrology/42.10.1813}, journal-iso = {J PETROL}, journal = {JOURNAL OF PETROLOGY}, volume = {42}, unique-id = {1855098}, issn = {0022-3530}, year = {2001}, eissn = {1460-2415}, pages = {1813-1843}, orcid-numbers = {Harangi, Szabolcs/0000-0003-2372-4581; Szabó, Csaba/0000-0002-1580-6344} } @article{MTMT:1855089, title = {Neogene to Quaternary Volcanism of the Carpathian-Pannonian Region - a review.}, url = {https://m2.mtmt.hu/api/publication/1855089}, author = {Harangi, Szabolcs}, journal-iso = {ACTA GEOL HUNG}, journal = {ACTA GEOLOGICA HUNGARICA: A QUARTERLY OF THE HUNGARIAN ACADEMY OF SCIENCES}, volume = {44}, unique-id = {1855089}, issn = {0236-5278}, year = {2001}, pages = {223-258}, orcid-numbers = {Harangi, Szabolcs/0000-0003-2372-4581} } @article{MTMT:2899915, title = {The mid-Hungarian line: a zone of repeated tectonic inversions}, url = {https://m2.mtmt.hu/api/publication/2899915}, author = {Csontos, L and Nagymarosy, András}, doi = {10.1016/S0040-1951(98)00163-2}, journal-iso = {TECTONOPHYSICS}, journal = {TECTONOPHYSICS}, volume = {297}, unique-id = {2899915}, issn = {0040-1951}, abstract = {The Mid-Hungarian line is a major tectonic feature of the Intra-Carpathian area separating two terranes of different origin and tectonic structure. Although this tectonic line was known from borehole records, it has not been described in seismic sections. The study presents interpreted seismic lines crossing the supposed trace of the Mid-Hungarian line. These seismic sections show north-dipping normal faults and thrust faults as well as cross-cutting young strike-slip faults. A complex tectonic history is deduced, including intra-Oligocene-Early Miocene thrusting, Middle Miocene extension, local Late Miocene inversion and Late Miocene-Pliocene normal faulting and left-lateral wrenching. In the light of our seismic study we think that the best candidate for the Mid-Hungarian line is a north-dipping detachment fault beneath large masses of Neogene volcanics. The auxiliary structures to the north seen on seismic sections suggest that it moved as a south-vergent thrust fault during the Palaeogene-Early Miocene which later was reactivated as a set of normal faults. The northern Alcapa unit overrode the southern Tisza-Dacia unit along this fault zone. The same relative positions are observed in the northern termination of the line. Other structures along the supposed trace of the line are north-dipping normal-or strike-slip faults which frequently were reactivated as smaller thrust faults during the late Neogene. Palaeogene-Early Miocene thrusting along the line might be the result of the opposite Tertiary rotations of the two major units, as suggested by palaeomagnetic measurements and earlier models. (C) 1998 Elsevier Science B.V. All rights reserved.}, year = {1998}, eissn = {1879-3266}, pages = {51-71} } @article{MTMT:2269599, title = {Fluid-inclusion evidence for an upper-mantle origin for green clinopyroxenes in late Cenozoic basanites from the Nograd-Gomor Volcanic Field, northern Hungary/southern Slovakia}, url = {https://m2.mtmt.hu/api/publication/2269599}, author = {Szabó, Csaba and Bodnar, RJ}, journal-iso = {INT GEOL REV}, journal = {INTERNATIONAL GEOLOGY REVIEW}, volume = {40}, unique-id = {2269599}, issn = {0020-6814}, abstract = {Green clinopyroxenes with elevated Fe and Na contents coexist with "normal" clinopyroxene phenocrysts in alkali basalts from the Nograd-Gomor Volcanic Field (NGVF) of northern Hungary and southern Slovakia. The coexistence of these clinopyroxenes with incompatible compositions in the same sample is often used as evidence for mixing between a mafic and a more evolved melt. However, results of fluid-inclusion, textural, and geochemical studies of samples from Tertiary basanites from the NGVF suggest that the majority of the green clinopyroxenes could not have formed from magma mixing but, rather, are products of lithospheric processes such as metasomatism or dynamic melt flow. Two distinct types of green clinopyroxenes have been identified. Group 1 green clinopyroxenes are Al rich and contain CO2 inclusions; Group 2 green clinopyroxenes are Al poor and lack CO2 inclusions. On the basis of analysis of CO2 inclusions, the Group 1 clinopyroxenes, observed as xenocrysts and major constituents of clinopyroxenite xenoliths, were entrained into the host basanitic magmas in the uppermost mantle. These clinopyroxenes originally formed during a metasomatic event or as a result of dynamic melt flow in the mantle. Group 2 clinopyroxenes likely represent xenocrysts from disaggregated dioritic cumulates produced from melt(s) related to the host basanitic magmas.}, keywords = {Hungary; PHASES; Quartz; petrology; ROCKS; BENEATH; SOUTHERN SLOVAKIA; MEGACRYSTS; CORE CLINOPYROXENES; ALKALI-BASALTS}, year = {1998}, eissn = {1938-2839}, pages = {765-773}, orcid-numbers = {Szabó, Csaba/0000-0002-1580-6344} } @article{MTMT:1255458, title = {Gravity constraints on the crustal structure and slab evolution along a transcarpathian transect}, url = {https://m2.mtmt.hu/api/publication/1255458}, author = {Szafian, P and Horváth, Ferenc and Cloetingh, S}, doi = {10.1016/S0040-1951(96)00260-0}, journal-iso = {TECTONOPHYSICS}, journal = {TECTONOPHYSICS}, volume = {272}, unique-id = {1255458}, issn = {0040-1951}, abstract = {A new, unified Bouguer anomaly map of the Carpathian are and the Pannonian basin has been compiled from previously prepared and recently published gravity maps. In order to constrain the crustal structure and the tectonic evolution of the area, a two-dimensional gravity model is presented along a Western Carpathians-Pannonian basin-Southern Carpathians transect. The model is based on deep seismic lines, where available, and on detailed geological sections. The results confirm that the extensional crustal structure of the Pannonian basin revealed by deep seismic surveys agrees with the gravity data. Furthermore, they suggest that the Western and Southern Carpathians are at different stages of their evolution: the subducted oceanic slab under the Western Carpathians has already been assimilated to the asthenosphere, while a crustal slab is still present under the Southern Carpathians. These findings are compatible with the observation that the last major phase of crustal shortening terminated at the early Middle Miocene in the Western Carpathians, but continued throughout the Pliocene in the Southern Carpathians.}, year = {1997}, eissn = {1879-3266}, pages = {233-247} } @article{MTMT:2195543, title = {Changing magma ascent rates in the Nógrád-Gömör volcanic field northern Hungary southern Slovakia: Evidence from CO2-rich fluid inclusions in metasomatized upper mantle xenoliths}, url = {https://m2.mtmt.hu/api/publication/2195543}, author = {Szabó, Csaba and Bodnar, RJ}, journal-iso = {PETROLOGY+}, journal = {PETROLOGY}, volume = {4}, unique-id = {2195543}, issn = {0869-5911}, abstract = {Metasomatized upper mantle xenoliths from the Nograd-Gomor Volcanic Field of north Hungary and south Slovakia contain two distinctly different occurrences of CO2 inclusions. An earlier generation of inclusions shows re-equilibration textures produced by hi,oh internal pressures generated following trapping. These inclusions were trapped below the MOHO at a depth of 30-50 km in the amphibole-bearing spinel lherzolite stability field, and their xenolith hosts were transported to the MOHO in approximate to 36 hours at an ascent rate of 0.1 m/sec. At the MOHO, fluid lost from the earlier generation of CO2 inclusions during re-equilibration was trapped to form a younger generation of CO2 inclusions. The xenoliths containing the inclusions were subsequently erupted from this depth to the surface in approximate to 1.5 hours at an ascent rate of 5 m/sec.}, keywords = {PHASE; PRESSURE; petrology; peridotite; Australia; AMPHIBOLE; VICTORIA; PHLOGOPITE}, year = {1996}, eissn = {1556-2085}, pages = {221-230}, orcid-numbers = {Szabó, Csaba/0000-0002-1580-6344} } @article{MTMT:2195496, title = {Metasomatism associated with subduction-related, volatile-rich silicate melt in the upper mantle beneath the Nógrád-Gömör volcanic field, northern Hungary southern Slovakia: Evidence from silicate melt inclusions}, url = {https://m2.mtmt.hu/api/publication/2195496}, author = {Szabó, Csaba and Bodnar, RJ and Sobolev, AV}, journal-iso = {EUR J MINERAL}, journal = {EUROPEAN JOURNAL OF MINERALOGY}, volume = {8}, unique-id = {2195496}, issn = {0935-1221}, abstract = {Metasomatized upper mantle xenoliths from the Nograd-Gomor Volcanic Field (NGVF) of north Hungary and south Slovakia contain ''andesitic'' and ''basaltic'' silicate melt inclusions hosted mainly in olivines. Melt pockets occur interstitial to mantle phases. Other melt accumulations are spatially associated with ortho- and clinopyroxenes and amphiboles. Petrographic and geochemical data suggest a common source for these distinctly different occurrences. Of the possible origins for the melt in inclusions, melt pockets and other melt accumulations, the one that is most consistent with the available data is a subduction-related, volatile-rich silicate melt that infiltrated through and interacted with mantle phases, causing cryptic and modal metasomatism in the peridotitic wall-rock and a progressive evolution of the melt composition to produce residual melts. Formation of melt pockets and multiphase silicate melt inclusions with ''basaltic'' composition was associated with the less residual melts. Conversely, more evolved melts, enriched in silica, alumina, alkalies and CO2, percolated through the shallow lithospheric mantle with little or no interaction and were trapped as ''andesitic'' silicate melt inclusions.}, keywords = {ORIGIN; GLASS; CANARY-ISLANDS; Silicate melt inclusions; Geochemistry; mineralogy; Peridotite xenoliths; Fluid inclusions; SPINEL PERIDOTITE XENOLITHS; AMPHIBOLE; melt pockets; mantle metasomatism; LHERZOLITE XENOLITHS; CARBONATITE METASOMATISM; Nograd-Gomor Volcanic Field (N-Hungary/S-Slovakia)}, year = {1996}, eissn = {1617-4011}, pages = {881-899}, orcid-numbers = {Szabó, Csaba/0000-0002-1580-6344} } @article{MTMT:2156105, title = {Mantle petrology and geochemistry beneath the Nógrád-Gömör Volcanic Field, Carpathian-Pannonian Region,}, url = {https://m2.mtmt.hu/api/publication/2156105}, author = {Szabó, Csaba and Taylor, L A}, doi = {10.1080/00206819409465465}, journal-iso = {INT GEOL REV}, journal = {INTERNATIONAL GEOLOGY REVIEW}, volume = {36}, unique-id = {2156105}, issn = {0020-6814}, year = {1994}, eissn = {1938-2839}, pages = {328-358}, orcid-numbers = {Szabó, Csaba/0000-0002-1580-6344} } @article{MTMT:1124683, title = {The petrogenesis of pliocene alkaline volcanic rocks from the Pannonian Basin, Eastern Central Europe. The petrogenesis of Pliocene alkaline volcanic rocks from the Pannonian Basin, Eastern Central Europe}, url = {https://m2.mtmt.hu/api/publication/1124683}, author = {Embey-Isztin, Antal and Downes, H and James, DE and Upton, BGJ and Dobosi, Gábor and Ingram, GA and Harmon, RS and Scharbert, HG}, doi = {10.1093/petrology/34.2.317}, journal-iso = {J PETROL}, journal = {JOURNAL OF PETROLOGY}, volume = {34}, unique-id = {1124683}, issn = {0022-3530}, abstract = {Late Tertiary post-orogenic alkaline basalts erupted in the extensional Pannonian Basin following Eocene-Miocene subduction and its related calc-alkaline volcanism. The alkaline volcanic centres, dated between 11.7 and 1.4 Ma, are concentrated in several regions of the Pannonian Basin. Some are near the western (Graz Basin, Burgenland), northern (Nograd), and eastern (Transylvania) margins of the basin, but the majority are concentrated near the Central Range (Balaton area and Little Hungarian Plain). Fresh samples from 31 volcanic centres of the extension-related lavas range from slightly hy-normative transitional basalts through alkali basalts and basanites to olivine nephelinites. No highly evolved compositions have been encountered. The presence of peridotite xenoliths, mantle xenocrysts, and high-pressure megacrysts, even in the slightly more evolved rocks, indicates that differentiation took place within the upper mantle. Rare earth elements (REE) and Sr-87/Sr-86, Nd-143/Nd-144, deltaO-18, deltaD, and Pb isotopic ratios have been determined on a subset of samples, and also on clinopyroxene and amphibole megacrysts. Sr and Nd isotope ratios span the range of Neogene alkali basalts from western and central Europe, and suggest that the magmas of the Pannonian Basin were dominantly derived from asthenospheric partial melting, but Pb isotopes indicate that in most cases they were modified by melt components from the enriched lithospheric mantle through which they have ascended. DeltaO-18 values indicate that the magmas have not been significantly contaminated with crustal material during ascent, and isotopic and trace-element ratios therefore reflect mantle source characteristics. Incompatible-element patterns show that the basic lavas erupted in the Balaton area and Little Hungarian Plain are relatively homogeneous and are enriched in K, Rb, Ba, Sr, and Pb with respect to average ocean island basalt, and resemble alkali basalts of Gough Island. In addition, Pb-207/Pb-204 is enriched relative to Pb-206/Pb-204. In these respects, the lavas of the Balaton area and the Little Hungarian Plain differ from those of other regions of Neogene alkaline magmatism of Europe. This may be due to the introduction of marine sediments into the mantle during the earlier period of subduction and metasomatism of the lithosphere by slab-derived fluids rich in K, Rb, Ba, Pb, and Sr. Lavas erupted in the peripheral areas have incompatible-element patterns and isotopic characteristics different from those of the central areas of the basin, and more closely resemble Neogene alkaline lavas from areas of western Europe where recent subduction has not occurred.}, year = {1993}, eissn = {1460-2415}, pages = {317-343} } @article{MTMT:1255446, title = {TOWARDS A MECHANICAL MODEL FOR THE FORMATION OF THE PANNONIAN BASIN}, url = {https://m2.mtmt.hu/api/publication/1255446}, author = {Horváth, Ferenc}, doi = {10.1016/0040-1951(93)90126-5}, journal-iso = {TECTONOPHYSICS}, journal = {TECTONOPHYSICS}, volume = {226}, unique-id = {1255446}, issn = {0040-1951}, abstract = {New maps showing crustal and lithospheric thickness variations in the Pannonian basin and the surrounding East Alpine, Carpathian and Dinaric mountains have been prepared on the basis of recent seismic, seismologic and electromagnetic data. A map presenting Miocene faults of regional significance has been also constructed for the same region by using a wealth of recently available national and/or more local studies. It is suggested that observed crustal and lithospheric structural contrasts have been controlled primarily by Neogene kinematic history of the region. Kinematic history is characterized by the following main patterns: (1) indentation by Adria and large-scale backthrusting in the Southern Alps; (2) eastward escape and extension of the Eastern Alps; (3) extensional collapse in the Pannonian basin area; (4) formation of broad wrench fault systems along strike in the Dinarides and Southern Carpathians, and the Western Carpathians with dextral and sinistral shear, respectively; (5) compression and accretion of the external thrust and fold belt in the Eastern Carpathians. These kinematic patterns are thought to be interrelated and all are manifestations of the late-stage evolution of an overthickened orogenic wedge. In order to arrive at a better understanding of the mechanism of extension, which formed the Pannonian basin, deep crustal seismic profiles, hydrocarbon exploration reflection lines and borehole data have been analyzed in the Little Hungarian Plain. This plain represents the transition zone between the Alps and the Pannonian lowlands, and the results are illustrated by eight interpreted cross-sections. One result of regional importance is the clear recognition that the Transdanubian Central Range at the southeastern flank of the Little Hungarian Plain is composed of Alpine (pre-Senonian) thrust sheets. This finding marks the end of a century of debate: the allochthony of the substrata of the Pannonian basin can be now considered proven. Another result of more general interest is that these cross-sections document the mode of lithospheric extension. Preexisting compressional detachment planes reactivate as low-angle normal faults and lead to tectonic unroofing of deeply buried metamorphic terranes characterized by ductile flow along subhorizontal lineation.}, year = {1993}, eissn = {1879-3266}, pages = {333-357} } @article{MTMT:1255443, title = {TERTIARY EVOLUTION OF THE INTRA-CARPATHIAN AREA - A MODEL}, url = {https://m2.mtmt.hu/api/publication/1255443}, author = {CSONTOS, L and Nagymarosy, András and Horváth, Ferenc and KOVAC, M}, doi = {10.1016/0040-1951(92)90346-8}, journal-iso = {TECTONOPHYSICS}, journal = {TECTONOPHYSICS}, volume = {208}, unique-id = {1255443}, issn = {0040-1951}, abstract = {The Outer Carpathian flysch nappes encircle an Intra-Carpathian domain which can be divided into two megatectonic units (North Pannonian and Tisza) mostly on the basis of contrasting Mesozoic and Palaeogene facies development. We see two major kinematic problems to be solved: (1) The present distribution of the Mesozoic and Palaeogene facies is mosaic-like, and some belts form exotic bodies within realms of Austroalpine affinity. (2) Late Eocene palinspastic reconstruction of the Outer Carpathian flysch nappes suggest, that the entire Intra-Carpathian area must have been located several hundreds of kilometres to the south and to the west of its present position. Neogene extension can account for shortening in the external Carpathian nappes, but is unable to explain Mesozoic facies anomalies and offsets of Palaeogene formations. We suggest that evolution of the Intra-Carpathian area involved first Late Palaeogene-Early Miocene juxtaposition of the North-Pannonian and Tisza megatectonic units, accompanied by the closure of the external Carpathian flysch troughs; thereafter extension of this amalgamated unit occurred, which was compensated by thrusting of flysch nappes onto the European foreland and formation of molasse foredeeps. Eastward escape of the North-Pannonian unit from the Alpine collisional belt involved left lateral shear along the Pieniny Klippen belt and right lateral shear along the Mid-Hungarian zone. Parts of the Late Palaeogene basin and an Early Miocene volcanic edifice were dissected, offset and elongated by several 100 kms. The driving mechanism of the eastward escape of the Intra-Carpathian area can be related to the collision of Apulia and Europe and the subduction of the external Carpathian crust under the Pannonian units. The escape ceased gradually in the Early Miocene, when oblique collision between the North-Pannonian unit and European continent occurred. Neogene extension of the Pannonian region was an areal deformation. The extension at locally variable rate resulted in the break-up of the heterogenous floor of the Neogene basin. The driving mechanism of basin extension and contemporaneous compressional deformation of the external Carpathians is thought to be related to ongoing subduction, involving the marginal part of the attenuated European continental crust. Tectonic activity in the Carpathians and basin subsidence and volcanism shifted in time and in unison from the west toward the east-southeast.}, year = {1992}, eissn = {1879-3266}, pages = {221-241} } @article{MTMT:1855796, title = {REVIEW OF NEOGENE AND QUATERNARY VOLCANISM OF THE CARPATHIAN PANNONIAN REGION}, url = {https://m2.mtmt.hu/api/publication/1855796}, author = {Szabó, Csaba and Harangi, Szabolcs and Csontos, László}, doi = {10.1016/0040-1951(92)90347-9}, journal-iso = {TECTONOPHYSICS}, journal = {TECTONOPHYSICS}, volume = {208}, unique-id = {1855796}, issn = {0040-1951}, year = {1992}, eissn = {1879-3266}, pages = {243-256}, orcid-numbers = {Szabó, Csaba/0000-0002-1580-6344; Harangi, Szabolcs/0000-0003-2372-4581} } @article{MTMT:1255406, title = {TRANSFORM FAULTING, EXTENSION, AND SUBDUCTION IN THE CARPATHIAN PANNONIAN REGION}, url = {https://m2.mtmt.hu/api/publication/1255406}, author = {ROYDEN, LH and Horváth, Ferenc and BURCHFIEL, BC}, doi = {10.1130/0016-7606(1982)93<717:TFEASI>2.0.CO;2}, journal-iso = {GEOL SOC AM BULL}, journal = {GEOLOGICAL SOCIETY OF AMERICA BULLETIN}, volume = {93}, unique-id = {1255406}, issn = {0016-7606}, year = {1982}, eissn = {1943-2674}, pages = {717-725} } @article{MTMT:1088575, title = {Late Cenozoic Evolution of Pannonian Basin}, url = {https://m2.mtmt.hu/api/publication/1088575}, author = {Stegena, Lajos and Géczy, Barnabás and Horváth, Ferenc}, doi = {10.1016/0040-1951(75)90114-6}, journal-iso = {TECTONOPHYSICS}, journal = {TECTONOPHYSICS}, volume = {26}, unique-id = {1088575}, issn = {0040-1951}, year = {1975}, eissn = {1879-3266}, pages = {71-90} }