@article{MTMT:2756658, title = {Tracing the origin of loess in Hungary with the help of heavy mineral composition data}, url = {https://m2.mtmt.hu/api/publication/2756658}, author = {Thamóné Bozsó, Edit and Ó.Kovács, L and Magyari, Á and Marsi, István}, doi = {10.1016/j.quaint.2013.04.030}, journal-iso = {QUATERN INT}, journal = {QUATERNARY INTERNATIONAL}, volume = {319}, unique-id = {2756658}, issn = {1040-6182}, year = {2014}, eissn = {1873-4553}, pages = {11-21} } @article{MTMT:2759264, title = {Application of attenuated total reflectance Fourier transform infrared spectroscopy in the mineralogical study of a landslide area, Hungary}, url = {https://m2.mtmt.hu/api/publication/2759264}, author = {Udvardi, Beatrix and Kovács, István János and Kónya, Péter and Földvári, M and Füri, Judit Izabella and Budai, F and Falus, György and Fancsik, Tamás and Szabó, Csaba and Szalai, Zoltán and Mihály, Judith}, doi = {10.1016/j.sedgeo.2014.08.005}, journal-iso = {SEDIMENT GEOL}, journal = {SEDIMENTARY GEOLOGY}, volume = {313}, unique-id = {2759264}, issn = {0037-0738}, abstract = {This study demonstrates that the unpolarized attenuated total reflectance Fourier transform infrared spectroscopy (ATR FTIR) is a practical and quick tool to distinguish different types of sediments in landslide-affected areas, and potentially other types of physical environments too. Identification and quantification of minerals by ATR FTIR is implemented on a set of powdered natural sediments from a loess landslide (Kulcs, Hungary). A protocol including sample preparation, analytical conditions and evaluation of sediment ATR spectra is outlined in order to identify and estimate major minerals in sediments. The comparison of the defined FTIR parameters against qualitative and quantitative results of X-ray diffraction and thermal analysis was used to validate the use of ATR FTIR spectroscopy for the considered sediments. The infrared band areas and their ratios (water/carbonates; silicates/carbonates; kaolinite) appear to be the most sensitive parameters to identify strongly weathered sediments such as paleosols and red clays which most likely facilitate sliding and could form sliding zones. The effect of grain size and orientation of anisotropic minerals on the wave number and intensity of some major absorption bands is also discussed.}, keywords = {Hungary; SEDIMENTS; grain size; landslides; ATR FTIR; landslide; Attenuated total reflectance Fourier transform infrared spectroscopy; Landslide areas; Anisotropy of calcite}, year = {2014}, eissn = {1879-0968}, pages = {1-14}, orcid-numbers = {Kovács, István János/0000-0002-3488-3716; Szabó, Csaba/0000-0002-1580-6344; Szalai, Zoltán/0000-0001-5267-411X} } @article{MTMT:2524367, title = {The Paks loess-paleosol sequence: A record of chemical weathering and provenance for the last 800 ka in the mid-Carpathian Basin}, url = {https://m2.mtmt.hu/api/publication/2524367}, author = {Újvári, Gábor and Raucsikné Varga, Andrea Beáta and Raucsik, Béla and Kovács, János}, doi = {10.1016/j.quaint.2012.04.004}, journal-iso = {QUATERN INT}, journal = {QUATERNARY INTERNATIONAL}, volume = {319}, unique-id = {2524367}, issn = {1040-6182}, abstract = {The Paks loess-paleosol sequence is one of the most important terrestrial records of Middle and Late Pleistocene environmental changes in East Central Europe, spanning the last ca. 0.8. Ma. While geochemical proxies demonstrate a general decreasing chemical weathering trend over the last 0.8. Ma in the Carpathian Basin, mineralogy and derived indices reflect intensifying physical erosion. In theory, the observed chemical weathering trend can be accounted for both by enhanced input of relatively unweathered material and by climate deterioration during the Quaternary, as the proxies such as CIA are not capable of distinguishing between pre- and post-depositional weathering. Enhanced physical erosion of the source areas, driven by tectonism, and resulting increased sedimentation of fresh mineral dust at the depositional site are demonstrated by increasing dolomite, illite and chlorite contents and sme/ill, sme/(ill. +. chl) ratios from older to younger sediments in the profile, together with increasing thickness of loess layers towards the youngest part of the sequence. At the same time, constant smectite contents (30-40%) in paleosols appear to disprove progressive aridization of interglacials through time and suggest that the duration of pedogenesis played an important role in determining soil types. Further, the increasing proportion of inherited phyllosilicates (illite and chlorite) would, in theory, raise the possibility that the decreasing values of chemical weathering indices are just artifacts of enhanced physical erosion and resulting increased dust deposition by a dilution effect. The above findings highlight the fact that the general view on chemical weathering is oversimplistic, as its 'equation' includes two basic variables, tectonism and time beyond climate and the interplay of these equally important factors will eventually determine its final value. To get a better grasp of these processes needs further data (more age control in loess profiles, data on uplift in and around sedimentary basins) and more sophisticated proxies, as the mineralogical data presented here can be considered only semiquantitative.Regarding the provenance of sediments in the Paks profile, geochemical data demonstrate that felsic rocks dominated the source areas and there have been only very little variations in provenance over the last ca. 0.8. Ma. Significant contributions from mafic/ultramafic rocks to the sediments can be ruled out as revealed by lower abundances of ferromagnesian trace elements. The appearance of amphiboles and high dolomite contents suggest that loess material was at least partly sourced from local rocks and geochemical data reveal a genetic link between floodplain sediments and loess deposits. © 2012 Elsevier Ltd and INQUA.}, year = {2014}, eissn = {1873-4553}, pages = {22-37}, orcid-numbers = {Újvári, Gábor/0000-0002-2816-6155; Raucsikné Varga, Andrea Beáta/0000-0002-8673-1482; Raucsik, Béla/0000-0002-1951-5974; Kovács, János/0000-0001-7742-5515} } @article{MTMT:2331930, title = {Clay mineralogy of red clay deposits from the central Carpathian Basin (Hungary): Implications for Plio-Pleistocene chemical weathering and palaeoclimate}, url = {https://m2.mtmt.hu/api/publication/2331930}, author = {Kovács, János and Raucsik, Béla and Raucsikné Varga, Andrea Beáta and Újvári, Gábor and Varga, György and Ottner, F}, doi = {10.3906/yer-1201-4}, journal-iso = {TURK J EARTH SCI}, journal = {TURKISH JOURNAL OF EARTH SCIENCES}, volume = {22}, unique-id = {2331930}, issn = {1300-0985}, abstract = {Geochemical and mineralogical studies of palaeosols provide essential information for palaeoclimatic and palaeoenvironmental interpretation of continental deposits and can present a proxy for palaeoclimate. Red clays in the central Carpathian Basin (Hungary) (Tengelic Red Clay Formation; Kerecsend Red Clay Formation), overlain by loess-palaeosol sequences, were studied. Results from geochemical climofunctions applied to Upper Pliocene-Lower Pleistocene red clays and palaeosols located in the Carpathian Basin, and clay mineralogy, indicate that the palaeoclimate was considerably more humid and warmer during the Late Pliocene-Early Pleistocene in comparison to modern values. © Tübi̇tak.}, keywords = {PLEISTOCENE; Pliocene; East Central Europe; loess; palaeoclimate; Red clay; Palaeosol}, year = {2013}, eissn = {1303-619X}, pages = {414-426}, orcid-numbers = {Kovács, János/0000-0001-7742-5515; Raucsik, Béla/0000-0002-1951-5974; Raucsikné Varga, Andrea Beáta/0000-0002-8673-1482; Újvári, Gábor/0000-0002-2816-6155; Varga, György/0000-0003-4784-6372} } @article{MTMT:1618474, title = {Plio-Pleistocene red clay deposits in the Pannonian basin: A review}, url = {https://m2.mtmt.hu/api/publication/1618474}, author = {Kovács, János and Fábián, Szabolcs Ákos and Varga, Gábor and Újvári, Gábor and Varga, György and Dezső, József}, doi = {10.1016/j.quaint.2010.12.013}, journal-iso = {QUATERN INT}, journal = {QUATERNARY INTERNATIONAL}, volume = {240}, unique-id = {1618474}, issn = {1040-6182}, abstract = {Terrestrial red clays underlying Quaternary loess deposits, or filling fissures and recently existing caves in limestone are named Tengelic Red Clay Formation and Kerecsend Red Clay Formation (Middle Pliocene to Lower Pleistocene). They occur in three types in Hungary. (1) The oldest red clays are mainly in situ weathering crusts rich in kaolinite, formed in warm, humid, subtropical or monsoon climate; (2) the younger type is rich in smectite and goethite; and (3) illite and chlorite dominant in the youngest part, which formed under warm and dry climates in savannah, steppe or forest steppe environments, and is of wind-blown origin. Representative samples were selected for study from a large number of profiles. Mineralogical, some micromorphological, and geochemical investigations of typical samples of red clays in Hungary were performed. This review focuses on the origin, development and distribution in the Pannonian basin. (C) 2010 Elsevier Ltd and INQUA. All rights reserved.}, keywords = {Pannonian Basin; Quaternary; mineralogy; paleoclimate; micromorphology; paleoenvironment; clay mineral; steppe; CAVE; loess; Pliocene-Pleistocene boundary; chemical weathering}, year = {2011}, eissn = {1873-4553}, pages = {35-43}, orcid-numbers = {Kovács, János/0000-0001-7742-5515; Fábián, Szabolcs Ákos/0000-0001-9127-2113; Újvári, Gábor/0000-0002-2816-6155; Varga, György/0000-0003-4784-6372} } @article{MTMT:1394245, title = {Tectonic versus climatic control on the evolution of a loess–paleosol sequence at Beremend, Hungary: An integrated approach based on paleoecological, clay mineralogical, and geochemical data}, url = {https://m2.mtmt.hu/api/publication/1394245}, author = {Raucsikné Varga, Andrea Beáta and Újvári, Gábor and Raucsik, Béla}, doi = {10.1016/j.quaint.2010.10.032}, journal-iso = {QUATERN INT}, journal = {QUATERNARY INTERNATIONAL}, volume = {240}, unique-id = {1394245}, issn = {1040-6182}, abstract = {The role of two major factors, climate and tectonism, in controlling loess-paleosol evolution has been evaluated in the present study based on a multi-proxy dataset comprising mollusc, bulk and clay mineralogical, and geochemical data. A recent trend has been to use chemical indices such as the chemical index of alteration (CIA) for paleoclimate reconstructions in loess-paleosol sequences spanning several hundreds of thousands of years, but without any tectonic interpretation. Possible effects of geodynamic factors on physical erosion, chemical weathering and consequently weathering proxies are discussed. Clearly, the relative rates of physical erosion and chemical weathering in a sedimentary environment could be significantly influenced by geodynamic factors and governed not just by climate. Intensifying tectonic uplift gives rise to enhanced physical erosion, leading to increased supply of fresh mineral surfaces having less time to react with weathering agents. In theory, this process may point towards decreasing chemical weathering in a sequence without any real changes of climate. In the studied loess-paleosol sequence at Beremend (Hungary) a trend of decreasing chemical weathering has been observed, which can be explained by a global climate deterioration and accelerating uplift in and around the sedimentary basin. Increasing dust sedimentation could theoretically also contribute to this process as a result of increasing aridification and wind strength reflecting climate change in weathering records following a non-linear amplification. The findings refer to the fact that the impact of tectonism should also be taken into consideration in tracing past chemical weathering trends on timescales of hundreds of thousands (or millions) of years. This is because tectonic effects may impose on the CIA signal and distort it suggesting a potential bias in reconstructing paleoclimate change based only on this proxy from certain loess sequences associated with young orogenic belts. (C) 2010 Elsevier Ltd and INQUA. All rights reserved.}, year = {2011}, eissn = {1873-4553}, pages = {71-86}, orcid-numbers = {Raucsikné Varga, Andrea Beáta/0000-0002-8673-1482; Újvári, Gábor/0000-0002-2816-6155; Raucsik, Béla/0000-0002-1951-5974} } @article{MTMT:1177744, title = {Comparative study on the Late Cenozoic red clay deposits from China and Central Europe (Hungary)}, url = {https://m2.mtmt.hu/api/publication/1177744}, author = {Kovács, János and Varga, György and Dezső, József}, journal-iso = {GEOL Q}, journal = {GEOLOGICAL QUARTERLY}, volume = {52}, unique-id = {1177744}, issn = {1641-7291}, year = {2008}, eissn = {2082-5099}, pages = {369-381}, orcid-numbers = {Kovács, János/0000-0001-7742-5515; Varga, György/0000-0003-4784-6372} } @article{MTMT:1130631, title = {Origin, weathering, and geochemical composition of loess in southwestern Hungary}, url = {https://m2.mtmt.hu/api/publication/1130631}, author = {Újvári, Gábor and Raucsikné Varga, Andrea Beáta and Balogh-Brunstad, Zs}, doi = {10.1016/j.yqres.2008.02.001}, journal-iso = {QUATERNARY RES}, journal = {QUATERNARY RESEARCH}, volume = {69}, unique-id = {1130631}, issn = {0033-5894}, year = {2008}, eissn = {1096-0287}, pages = {421-437}, orcid-numbers = {Újvári, Gábor/0000-0002-2816-6155; Raucsikné Varga, Andrea Beáta/0000-0002-8673-1482} } @article{MTMT:1105156, title = {Chemical Weathering Intensity of The Late Cenozoic "Red Clay" Deposits in The Carpathian Basin}, url = {https://m2.mtmt.hu/api/publication/1105156}, author = {Kovács, János}, doi = {10.1134/S0016702907100096}, journal-iso = {GEOCHEM INT+}, journal = {GEOCHEMISTRY INTERNATIONAL}, volume = {45}, unique-id = {1105156}, issn = {0016-7029}, year = {2007}, eissn = {1556-1968}, pages = {1056-1063}, orcid-numbers = {Kovács, János/0000-0001-7742-5515} } @book{MTMT:1330081, title = {Geochemical Atlas of Europe. Part 1 - Background Information, Methodology, and Maps}, url = {https://m2.mtmt.hu/api/publication/1330081}, isbn = {9516909213}, editor = {Salminen, R (Chief-editor) and Batista, M J and Bidovec, M and Demetriades, A and De Vivo, B and De Vos, W and Duris, M and Gilucis, A and Gregorauskiene, V and Halamic, J and Heitzmann, P and Lima, A and Jordán, Győző and Klaver, G and Klein, P and Lis, J and Locutura, J and Marsina, K and Mazreku, A and O'Connor, P J and Olsson, S Å and Ottesen, R -T and Petersell, V and Plant, J A and Reeder, S and Salpeteur, I and Sandström, H and Siewers, U and Steenfelt, A and Tarvainen, T}, publisher = {Geologian tutkimuskeskus}, unique-id = {1330081}, abstract = {The IUGS/IAGC Global Geochemical Baselines Programme aims to establish a global geochemical reference baseline for >60 determinants in a range of media for environmental and other applications. The European contribution to the programme has been carried out by government institutions from 26 countries under the auspices of the Forum of European Geological Surveys (FOREGS) The main objectives of this European survey were: 1) to apply standardised methods of sampling, chemical analysis and data management to prepare a geochemical baseline across Europe; and 2) to use this reference network to level national baseline datasets. Samples of stream water, stream sediment and three types of soil (organic top layer, minerogenic top and sub soil) have been collected at 900 stations, each representing a catchment area of 100 km2, corresponding to a sampling density of about one sample per 4700 km2. In addition, the uppermost 25 cm of floodplain sediment was sampled from 790 sites each representing a catchment area of 1000 km2. All soil and sediment samples were prepared at the same laboratory, and all samples of particular sample types were analysed by the same method at the same laboratory. More than 50 elements, both total and aqua regia extractable concentrations, and other parameters (such as pH and grain size) were determined on the <2 mm grain size fraction of minerogenic samples, and total concentrations of organic soil samples were measured after using a strong acid digestion. Nine laboratories of European geological surveys carried out the analytical work. Altogether, 360 geochemical maps showing the distribution of elements across Europe have been prepared. All the results and field observations are organised in a common database and the maps are published as a Geochemical Atlas of Europe. All the sampling sites were photographed and this photo archive is also available. Samples have been archived in the Slovak Republic for possible future use. Initial results show that the distribution patterns of both water and solid samples are related to such factors as large-scale tectonic provinces, geochemical variation of large lithological units, extension of the Weichselian glaciation, and contamination reflecting industrialized areas and regions of intensive agriculture.}, year = {2005} } @article{MTMT:1398130, title = {Javaslatok Magyarország földtani képződményeinek litosztratigráfiai tagolására}, url = {https://m2.mtmt.hu/api/publication/1398130}, author = {Gyalog, László and Budai, Tamás}, journal-iso = {M ÁLL FÖLDT INT JELENT}, journal = {MAGYAR ÁLLAMI FÖLDTANI INTÉZET ÉVI JELENTÉSE}, volume = {2002}, unique-id = {1398130}, issn = {0368-9751}, year = {2002}, pages = {195-232} }