TY - JOUR AU - Thamóné Bozsó, Edit AU - Ó.Kovács, L AU - Magyari, Á AU - Marsi, István TI - Tracing the origin of loess in Hungary with the help of heavy mineral composition data JF - QUATERNARY INTERNATIONAL J2 - QUATERN INT VL - 319 PY - 2014 SP - 11 EP - 21 PG - 11 SN - 1040-6182 DO - 10.1016/j.quaint.2013.04.030 UR - https://m2.mtmt.hu/api/publication/2756658 ID - 2756658 N1 - #Szerző nem található: Thamó-Bozsó E. #hozzárendelt szerző nem található: Ó.Kovács, L; Magyari, Á; Marsi, I LA - English DB - MTMT ER - TY - JOUR AU - Udvardi, Beatrix AU - Kovács, István János AU - Kónya, Péter AU - Földvári, M AU - Füri, Judit Izabella AU - Budai, F AU - Falus, György AU - Fancsik, Tamás AU - Szabó, Csaba AU - Szalai, Zoltán AU - Mihály, Judith TI - Application of attenuated total reflectance Fourier transform infrared spectroscopy in the mineralogical study of a landslide area, Hungary JF - SEDIMENTARY GEOLOGY J2 - SEDIMENT GEOL VL - 313 PY - 2014 SP - 1 EP - 14 PG - 14 SN - 0037-0738 DO - 10.1016/j.sedgeo.2014.08.005 UR - https://m2.mtmt.hu/api/publication/2759264 ID - 2759264 N1 - Lithosphere Fluid Research Lab, Institute of Geography and Earth Sciences, Eötvös University, Pazmány Péter sétány 1/c, Budapest, 1117, Hungary Geochemical and Laboratory Department, Geological and Geophysical Institute of Hungary, Stefánia út 14, Budapest, 1143, Hungary Department of Environmental and Landscape Geography, Institute of Geography and Earth Sciences Faculty of Science, Eötvös University, Pazmány Péter sétány 1/c, Budapest, 1117, Hungary Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar Tudósok Körútja 2, Budapest, 1117, Hungary Cited By :21 Export Date: 27 October 2020 Correspondence Address: Kovács, I.J.; Geochemical and Laboratory Department, Geological and Geophysical Institute of Hungary, Stefánia út 14, Hungary AB - 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. LA - English DB - MTMT ER - TY - JOUR AU - Újvári, Gábor AU - Raucsikné Varga, Andrea Beáta AU - Raucsik, Béla AU - Kovács, János TI - The Paks loess-paleosol sequence: A record of chemical weathering and provenance for the last 800 ka in the mid-Carpathian Basin JF - QUATERNARY INTERNATIONAL J2 - QUATERN INT VL - 319 PY - 2014 SP - 22 EP - 37 PG - 16 SN - 1040-6182 DO - 10.1016/j.quaint.2012.04.004 UR - https://m2.mtmt.hu/api/publication/2524367 ID - 2524367 AB - 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. LA - English DB - MTMT ER - TY - JOUR AU - Kovács, János AU - Raucsik, Béla AU - Raucsikné Varga, Andrea Beáta AU - Újvári, Gábor AU - Varga, György AU - Ottner, F TI - Clay mineralogy of red clay deposits from the central Carpathian Basin (Hungary): Implications for Plio-Pleistocene chemical weathering and palaeoclimate JF - TURKISH JOURNAL OF EARTH SCIENCES J2 - TURK J EARTH SCI VL - 22 PY - 2013 IS - 3 SP - 414 EP - 426 PG - 13 SN - 1300-0985 DO - 10.3906/yer-1201-4 UR - https://m2.mtmt.hu/api/publication/2331930 ID - 2331930 N1 - Cited By :12 Export Date: 24 September 2019 Correspondence Address: Kovács, J.; Department of Geology, University of Pécs, Ifjúság u. 6, H-7624 Pécs, Hungary; email: jones@gamma.ttk.pte.hu AB - 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. LA - English DB - MTMT ER - TY - JOUR AU - Kovács, János AU - Fábián, Szabolcs Ákos AU - Varga, Gábor AU - Újvári, Gábor AU - Varga, György AU - Dezső, József TI - Plio-Pleistocene red clay deposits in the Pannonian basin: A review JF - QUATERNARY INTERNATIONAL J2 - QUATERN INT VL - 240 PY - 2011 IS - 1-2 SP - 35 EP - 43 PG - 9 SN - 1040-6182 DO - 10.1016/j.quaint.2010.12.013 UR - https://m2.mtmt.hu/api/publication/1618474 ID - 1618474 N1 - Megjegyzés-23331086 : Gyorgy/F-1039-2012 Megjegyzés-22375092 Z9: 2 WC: Geography, Physical; Geosciences, Multidisciplinary Megjegyzés-22001855 Z9: 2 WC: Geography, Physical; Geosciences, Multidisciplinary Department of Geology, University of Pécs, Ifjusag u. 6, H-7624 Pécs, Hungary Department of Physical Geography, University of Pécs, Ifjsag u. 6, H-7624 Pécs, Hungary Geodetic and Geophysical Research Institute, Hungarian Academy of Sciences, Csatkai E. u. 6-8, H-9400 Sopron, Hungary Geographical Research Institute, Hungarian Academy of Sciences, Budarsit 45, H-1112 Budapest, Hungary Institute of Environmental Sciences, University of Pécs, Ifjsg u. 6, H-7624 Pécs, Hungary Cited By :27 Export Date: 24 September 2019 Correspondence Address: Kovács, J.; Department of Geology, University of Pécs, Ifjusag u. 6, H-7624 Pécs, Hungary; email: jones@gamma.ttk.pte.hu AB - 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. LA - English DB - MTMT ER - TY - JOUR AU - Raucsikné Varga, Andrea Beáta AU - Újvári, Gábor AU - Raucsik, Béla TI - 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 JF - QUATERNARY INTERNATIONAL J2 - QUATERN INT VL - 240 PY - 2011 IS - 1-2 SP - 71 EP - 86 PG - 16 SN - 1040-6182 DO - 10.1016/j.quaint.2010.10.032 UR - https://m2.mtmt.hu/api/publication/1394245 ID - 1394245 N1 - Megjegyzés-24849663 Megjegyzés-22001851 Z9: 1 WC: Geography, Physical; Geosciences, Multidisciplinary AB - 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. LA - English DB - MTMT ER - TY - JOUR AU - Kovács, János AU - Varga, György AU - Dezső, József TI - Comparative study on the Late Cenozoic red clay deposits from China and Central Europe (Hungary) JF - GEOLOGICAL QUARTERLY J2 - GEOL Q VL - 52 PY - 2008 IS - 4 SP - 369 EP - 381 PG - 13 SN - 1641-7291 UR - https://m2.mtmt.hu/api/publication/1177744 ID - 1177744 N1 - Megjegyzés-20524821 380.o. bibl. LA - English DB - MTMT ER - TY - JOUR AU - Újvári, Gábor AU - Raucsikné Varga, Andrea Beáta AU - Balogh-Brunstad, Zs TI - Origin, weathering, and geochemical composition of loess in southwestern Hungary JF - QUATERNARY RESEARCH J2 - QUATERNARY RES VL - 69 PY - 2008 IS - 3 SP - 421 EP - 437 PG - 17 SN - 0033-5894 DO - 10.1016/j.yqres.2008.02.001 UR - https://m2.mtmt.hu/api/publication/1130631 ID - 1130631 LA - English DB - MTMT ER - TY - JOUR AU - Kovács, János TI - Chemical Weathering Intensity of The Late Cenozoic "Red Clay" Deposits in The Carpathian Basin JF - GEOCHEMISTRY INTERNATIONAL J2 - GEOCHEM INT+ VL - 45 PY - 2007 IS - 10 SP - 1056 EP - 1063 PG - 8 SN - 0016-7029 DO - 10.1134/S0016702907100096 UR - https://m2.mtmt.hu/api/publication/1105156 ID - 1105156 LA - English DB - MTMT ER - TY - BOOK ED - Salminen, R (Chief-editor) ED - Batista, M J ED - Bidovec, M ED - Demetriades, A ED - De Vivo, B ED - De Vos, W ED - Duris, M ED - Gilucis, A ED - Gregorauskiene, V ED - Halamic, J ED - Heitzmann, P ED - Lima, A ED - Jordán, Győző ED - Klaver, G ED - Klein, P ED - Lis, J ED - Locutura, J ED - Marsina, K ED - Mazreku, A ED - O'Connor, P J ED - Olsson, S Å ED - Ottesen, R -T ED - Petersell, V ED - Plant, J A ED - Reeder, S ED - Salpeteur, I ED - Sandström, H ED - Siewers, U ED - Steenfelt, A ED - Tarvainen, T TI - Geochemical Atlas of Europe. Part 1 - Background Information, Methodology, and Maps ET - 0 PB - Geological Survey of Finland CY - Espoo PY - 2005 SP - 526 SN - 9516909213 UR - https://m2.mtmt.hu/api/publication/1330081 ID - 1330081 AB - 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. LA - English DB - MTMT ER - TY - JOUR AU - Gyalog, László AU - Budai, Tamás TI - Javaslatok Magyarország földtani képződményeinek litosztratigráfiai tagolására JF - MAGYAR ÁLLAMI FÖLDTANI INTÉZET ÉVI JELENTÉSE J2 - M ÁLL FÖLDT INT JELENT VL - 2002 PY - 2002 SP - 195 EP - 232 PG - 38 SN - 0368-9751 UR - https://m2.mtmt.hu/api/publication/1398130 ID - 1398130 LA - Hungarian DB - MTMT ER -