@article{MTMT:2421702, title = {Partial melting and melt segregation in footwall units within the contact aureole of the Sudbury Igneous Complex (North and East Ranges, Sudbury structure), with implications for their relationship to footwall Cu–Ni–PGE mineralization}, url = {https://m2.mtmt.hu/api/publication/2421702}, author = {Attila, Péntek and Molnár, Ferenc and David, H Watkinson and Peter, C Jones and Aberra, Mogessie}, doi = {10.1080/00206810903101313}, journal-iso = {INT GEOL REV}, journal = {INTERNATIONAL GEOLOGY REVIEW}, volume = {53}, unique-id = {2421702}, issn = {0020-6814}, keywords = {TEMPERATURE; Canada; Geochemistry; petrogenesis; partial melting; Ontario; breccia; impact structure; GRANITE SYSTEM; BUSHVELD COMPLEX; STRATHCONA EMBAYMENT; HYDROTHERMAL PROCESSES; Sudbury; miarolite; footwall granophyre; contact aureole}, year = {2011}, eissn = {1938-2839}, pages = {291-325}, orcid-numbers = {Molnár, Ferenc/0000-0002-1873-1915} } @article{MTMT:21749655, title = {Blocky versus fluidal peperite textures developed in volcanic conduits, vents and crater lakes of phreatomagmatic volcanoes in Mio/Pliocene volcanic fields of Western Hungary}, url = {https://m2.mtmt.hu/api/publication/21749655}, author = {Martin, U and Németh, Károly}, doi = {10.1016/j.jvolgeores.2006.06.010}, journal-iso = {J VOLCANOL GEOTH RES}, journal = {JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH}, volume = {159}, unique-id = {21749655}, issn = {0377-0273}, abstract = {Volcanic fields in the Pannonian Basin, Western Hungary, comprise several Mio/Pliocene volcaniclastic successions that are penetrated by numerous mafic intrusions. Peperite formed where intrusive and extrusive basaltic magma mingled with tuff, lapilli-tuff, and non-volcanic siliciclastic sediments within vent zones. Peperite is more common in the Pannonian Basin than generally realised and may be also important in other settings where sediment sequences accumulate during active volcanism. Hajagos-hegy, an erosional remnant of a maar volcano, was subsequently occupied by a lava lake that interacted with unconsolidated sediments in the maar basin and formed both blocky and globular peperite. Similar peperite developed in Kissomlyo, a small tuff ring remnant, where dykes invaded lake sediments that formed within a tuff ring. Lava foot peperite from both Hajagos-hegy and Kissomlyo were formed when small lava flows travelled over wet sediments in craters of phreatomagmatic volcanoes. At Sag-hegy, a large phreatomagmatic volcanic complex, peperite formed along the margin of a coherent intrusion. All peperite in this study could be described as globular or blocky peperite. Globular and blocky types in the studied fields occur together regardless of the host sediment. (c) 2006 Elsevier B.V. All rights reserved.}, year = {2007}, eissn = {1872-6097}, pages = {164-178} } @article{MTMT:1248735, title = {Boron and chlorine concentration of volcanic rocks: an application of prompt gamma activation analysis}, url = {https://m2.mtmt.hu/api/publication/1248735}, author = {Gméling, Katalin and Harangi, Szabolcs and Kasztovszky, Zsolt}, doi = {10.1007/s10967-005-0810-x}, journal-iso = {J RADIOANAL NUCL CHEM}, journal = {JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY}, volume = {265}, unique-id = {1248735}, issn = {0236-5731}, abstract = {Boron and chlorine concentrations in geological standards and in representative volcanic rock samples were determined by prompt gamma activation analysis (PGAA). The results of the GSJ standard measurements proved the high precision of PGAA in measuring the boron, chlorine, other trace elements (Sc, Nd, Sm, and Gd) and the major element contents of the samples. The rock samples originate from the western part of the Northern-Pannonian Volcanic Field (NPVF), which includes the Central Slovakian Volcanic Field (CSVF), the Borzsony and the Visegrad Mts. (VMt.). The oldest 16-13.5 Ma samples as the first products of the Miocene calc-alkaline volcanism are the most enriched in B (11-29 mu g/g), whereas the primitive basaltic andesites (from CSVF), the latest products (9 Ma) of the volcanic activity have lower B content (8-9 mu g/g). The measured B concentrations correlate positively with fluid-mobile elements, and the trace element pattern of the samples show subduction related signatures. The chlorine content of the investigated samples shows wide variation between 42.62 and 1148.45 mu g/g. The 9 Ma samples from the CSVF show Cl contents between 150-160 mu g/g. In agreement with the latest geodynamic models of the Neogene calc-alkaline volcanism(1,2) in the NPVF during the shallow, prograding subduction, the fluid-mobile elements metasomatized the mantle wedge. Thus the oldest volcanic rocks have relatively higher B (>11 mu g/g) and high but variable Cl contents. As the subduction waned and extension proceeded, the magma generation region changed to a not thoroughly metasomatized mantle by the former subduction event, resulting in lower B, low and stable Cl content of the younger (9 Ma) volcanic rocks.}, year = {2005}, eissn = {1588-2780}, pages = {201-212}, orcid-numbers = {Gméling, Katalin/0000-0003-0253-0745; Harangi, Szabolcs/0000-0003-2372-4581} } @article{MTMT:1037022, title = {Soft-sediment deformation structures in Late Miocene-Pleistocene sediments on the pediment of the Matra Hills (Visonta, Atkar, Verseg): Cryoturbation, load structures or seismites?}, url = {https://m2.mtmt.hu/api/publication/1037022}, author = {Horváth, Zoltán and Csákiné Michéli, Erika and Mindszenty, Andrea and Berényi Üveges, Judit}, doi = {10.1016/j.tecto.2005.08.012}, journal-iso = {TECTONOPHYSICS}, journal = {TECTONOPHYSICS}, volume = {410}, unique-id = {1037022}, issn = {0040-1951}, abstract = {The studied area, built up by silty clayey and partly sandy sediments and paleosols, lies on the tectonically active Northern margins of the Pannonian Basin. Wavy, sagging load casts can be observed in the upper part of the Late Miocene alluvial complex and larger scale sagging load casts, flame structures, drops and pillows detected in its Quaternary cover were studied in detail, in order to understand the origins of soft sediment deformation which characterized this young sedimentary suite. Sedimentological, paleopedological and mineralogical observations suggest that:One of the reasons for the soft-sediment deformation might have been the relatively low cohesive strength of the predominantly smectitic sediment covering a gentle slope similar to the actual landscape.On such a surface, the down-slope gravitational component of the mud- blanket might easily have been sufficient to overcome its cohesive strength.Frost action traceable in the studied formations might also have contributed to the observed deformation, particularly along the eroded top of the Late Miocene sediments. Combined evidence from field observations and laboratory analyses support the idea that liquefaction fluidization was of prime importance in bringing about the observed structures. In conclusion two alternative Quaternary/Holocene scenarios are proposed, which might have resulted in the unusual behaviour of the sediments/paleosols. One is a seismic event, the other is the combined effect of freeze thaw cycles and of the sloping foothill position, which might have resulted in episodic downslope transport and the associated deformation of the eroded soil material when its water content surpassed a certain threshold. We accept that the anomalous abundance of soft-sediment deformation in this marginal position may be causally related to paleo-earthquakes, but the obvious complexity of the phenomenon requires caution. In case the proposed scenarios would not have been alternatives but acted simultaneously, the analysed phenomena were to be interpreted as the joint results of tectonics and climate change.}, year = {2005}, eissn = {1879-3266}, pages = {81-95}, orcid-numbers = {Csákiné Michéli, Erika/0000-0002-8111-8005; Mindszenty, Andrea/0000-0001-8927-3053} } @book{MTMT:1384567, title = {Mio/Pliocene phreatomagmatic volcanism in the western Pannonian Basin}, url = {https://m2.mtmt.hu/api/publication/1384567}, isbn = {9636712387}, author = {Martin, U and Németh, Károly}, publisher = {Geological Institute of Hungary}, unique-id = {1384567}, year = {2004} } @article{MTMT:25754044, title = {Peperitic lava lake-fed sills at Sag-hegy, western Hungary: A complex interaction of a wet tephra ring and lava}, url = {https://m2.mtmt.hu/api/publication/25754044}, author = {Martin, U and Németh, Károly}, doi = {10.1144/GSL.SP.2004.234.01.04}, journal-iso = {GEOL SOC SPEC PUBL}, journal = {GEOLOGICAL SOCIETY SPECIAL PUBLICATIONS}, volume = {234}, unique-id = {25754044}, issn = {0305-8719}, abstract = {Sag-hegy is the remnant of a complex volcano consisting of several phreatomagmatic pyroclastic sequences preserved in immediate contact with a thick (c. 50 m) coherent lava body. Due to the intensive quarrying, the inner part of the lava has been removed, leaving behind a castle-like architecture of pyroclastic rocks. The outcrop walls thus demonstrate the irregular morphology of the lava, which was emplaced in a NW-SE-trending ellipsoidal vent zone in a phreatomagmatic volcano. Pyroclastic beds in the quarry wall are cross-cut by dykes and sills, inferred to have been fed from a central magma zone. Thin (< 10 cm) strongly chilled, black, angularly jointed aphanitic basaltic lava mantles the pyroelastic sequence, and has a corrugated margin as a consequence of sudden chilling against the cold and wet phreatomagmatic tephra in the inner wall of the tuft ring crater. These corrugated zones are inferred to be a characteristic textural feature, indicating extensive mixing of lava and host tephra which led to peperite formation along the outer rim lava lake. A spectrum of peperite formed along the lake margin, and fluid oscillation, due to fluidization of the wet tephra, disrupted a steam envelope formed around the lava, causing basaltic magma to invade and mix with the phreatomagmatic tephra. The presence of unconformities in the tephra ring facilitated the formation of sills fed from the central lava body.}, year = {2004}, eissn = {2041-4927}, pages = {33-50} } @inbook{MTMT:1805949, title = {Principles of PGAA method}, url = {https://m2.mtmt.hu/api/publication/1805949}, author = {Révay, Zsolt and Belgya, Tamás}, booktitle = {Handbook of Prompt Gamma Activation Analysis with Neutron Beams}, doi = {10.1007/978-0-387-23359-8_1}, unique-id = {1805949}, year = {2004}, pages = {1-30} } @article{MTMT:148644, title = {Relationships between volcanism and hydrothermal activity in the Tokaj Mountains, Northeast Hungary, based on K-Ar ages}, url = {https://m2.mtmt.hu/api/publication/148644}, author = {Pécskay, Zoltán and Molnár, Ferenc}, journal-iso = {GEOL CARPATH}, journal = {GEOLOGICA CARPATHICA}, volume = {53}, unique-id = {148644}, issn = {1335-0552}, abstract = {Conventional K-Ar studies of volcanic rocks, rock-forming minerals and hydrothermal adularia and alunite from different volcanic centres of the Tokaj Mts indicate that volcanic activity took place between 15.2 and 9.4 Ma (Badenian-Sarmatian-Pannonian). In the northern part of the Tokaj Mts, ages for the relatively deeply eroded hydrothermal systems (Rudabanyacska and Telkibanya Au-Ag deposits and parts of the Regec caldera), formed mainly by the adularia-bearing low-sulphidation epithermal deposits, are between 13.0 and 12.2 Ma. These systems were developed within andesitic-dacitic volcanic centres with calderas and subvolcanic intrusions. In the southern parts of the Tokaj Mts (near Mad and in the Szerenes Hills region) exposures of hydrothermal systems mainly represent shallow acid-sulphate steam-heated zones of low-sulphidation-type systems, and the K-Ar ages are between 12.1 and 10.4 Ma. Radiometric ages also suggest that in some parts of this latter area, repeated hydrothermal activity occurred, suggesting that hydrothermal circulation developed in relation to different magmatic centres that were active at different times.}, keywords = {Hungary; VOLCANISM; carpathians; radiometric method; potassium-argon dating; Miocene; Hydrothermal activity; K-Ar ages; Miocene volcanism; epithermal deposit; Epithermal deposits}, year = {2002}, eissn = {1336-8052}, pages = {303-314}, orcid-numbers = {Molnár, Ferenc/0000-0002-1873-1915} } @article{MTMT:1070159, title = {Shallow level low-sulphidation type epithermal systems in the Regéc caldera, Central Tokaj Mts., NE-Hungary}, url = {https://m2.mtmt.hu/api/publication/1070159}, author = {Bajnóczi, Bernadett and Molnár, Ferenc and Maeda, K and Izawa, E}, journal-iso = {GEOL CARPATH}, journal = {GEOLOGICA CARPATHICA}, volume = {51}, unique-id = {1070159}, issn = {1335-0552}, year = {2000}, eissn = {1336-8052}, pages = {217-227}, orcid-numbers = {Bajnóczi, Bernadett/0000-0003-0006-7611; Molnár, Ferenc/0000-0002-1873-1915} } @article{MTMT:1233769, title = {Investigation of impurities in thermoluminescent Al2O3 materials by prompt-gamma activation analysis}, url = {https://m2.mtmt.hu/api/publication/1233769}, author = {Kasztovszky, Zsolt and Révay, Zsolt and Belgya, Tamás and Fazekas, B and Östör, J and Molnár, Gábor and Molnár, G and Borossay, J}, doi = {10.1039/a808857h}, journal-iso = {J ANAL ATOM SPECTROM}, journal = {JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY}, volume = {14}, unique-id = {1233769}, issn = {0267-9477}, abstract = {alpha-Al2O3 is one of the most important materials for thermoluminescence dosimetry. The thermoluminescent features are strongly affected by impurities, which were investigated with the non-destructive method of prompt-gamma activation analysis (PGAA). Impurities in four samples of thermoluminescent alumina materials were investigated. The precision and reproducibility of the PGAA method were also tested on standard samples spiked with B, Na, S, Cl, Fe, Cu and Ag.}, year = {1999}, eissn = {1364-5544}, pages = {593-596} } @{MTMT:1070190, title = {Epithermal mineralization of the Tokaj Mountains, Northeast Hungary: Shallow levels of low-sulfidation type systems}, url = {https://m2.mtmt.hu/api/publication/1070190}, author = {Molnár, Ferenc and Zelenka, T and Mátyás, E and Pécskay, Zoltán and Bajnóczi, Bernadett and Kiss, János and Horváth, I}, booktitle = {Epithermal mineralization of the Western Carpathians}, unique-id = {1070190}, year = {1999}, pages = {109-153}, orcid-numbers = {Molnár, Ferenc/0000-0002-1873-1915; Bajnóczi, Bernadett/0000-0003-0006-7611; Kiss, János/0000-0001-8589-1364} } @inproceedings{MTMT:1233763, title = {The new Budapest capture gamma-ray facility}, url = {https://m2.mtmt.hu/api/publication/1233763}, author = {Belgya, Tamás and Révay, Zsolt and Fazekas, B and Héjja, I and Dabolczi, L and Molnár, Gábor and Kis, Zoltán and Östör, J and Kaszás, GY}, booktitle = {Proc. 9th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics}, unique-id = {1233763}, year = {1997}, pages = {826-837}, orcid-numbers = {Kis, Zoltán/0000-0002-8365-8507} } @article{MTMT:1233764, title = {The New Prompt Gamma Activation Facility at Budapest}, url = {https://m2.mtmt.hu/api/publication/1233764}, author = {Molnár, Gábor and Belgya, Tamás and Dabolczi, L and Fazekas, B and Révay, Zsolt and Veres, Árpád and Bikit, I and Östör, J}, doi = {10.1007/BF02109886}, journal-iso = {J RADIOANAL NUCL CHEM}, journal = {JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY}, volume = {215}, unique-id = {1233764}, issn = {0236-5731}, abstract = {Prompt gamma-activation analysis (PGAA) is an important complementary technique to conventional instrumental activation analysis that can be successfully used in a number of cases when INAA is not applicable. Therefore, a PGAA facility has been constructed at the recently refurbished and upgraded Budapest Research Reactor. It occupies the end position of a new curved thermal guide of 30 m length and 2.5 x 10 cm(2) cross section which provides a clean beam of low energy neutrons. The sophisticated HPGe-BGO gamma-ray spectrometer system can be operated in Compton-suppression and pair-spectrometer modes simultaneously. The octal splining of the main EGO improves efficient pair mode operation when coincidences between pairs of opposite segments and the HPGe detector are required separately. Gamma-gamma coincidence measurements will also be possible when the new multiparameter data acquisition system is completed. One of the main tasks at the new facility will be the accumulation of new spectroscopic data for detector calibration and standardisation, as well as for the construction of a more accurate prompt gamma-ray library for the chemical elements. Various applications are planned, such as the determination of hydrogen in fullerenes and of toxic trace elements in environmental samples.}, year = {1997}, eissn = {1588-2780}, pages = {111-115} } @article{MTMT:1538712, title = {A Tokaji-hegység intermedier és bázisos vulkánosságának kora és időtartama a K/Ar vizsgálatok tükrében.}, url = {https://m2.mtmt.hu/api/publication/1538712}, author = {Székyné, Fux V and Balogh, Kadosa and Szakáll, Sándor}, journal-iso = {FÖLDTANI KÖZLÖNY}, journal = {FÖLDTANI KÖZLÖNY}, volume = {111}, unique-id = {1538712}, issn = {0015-542X}, year = {1981}, eissn = {2559-902X}, pages = {413-423} }