Kovács, János

Lukoczki, G.

Ottner, Franz

Seelos, K.

Varga, György

Újvári, Gábor

English

Repository of the Academy's Library

Geophysical Research AbstractsVol. 15, EGU2013-10697, 2013EGU General Assembly 2013© Author(s) 2013. CC Attribution 3.0 License.Pedostratigraphy of pre-Quaternary/Quaternary red paleosols fromCentral Europe based on geochemical and clay mineralogical proxiesJános Kovács (1,2), Gábor Újvári (3), Klemens Seelos (4), György Varga (5), Franz Ottner (6), GeorginaLukoczki (1,2)(1) Department of Geology, University of Pécs, Pécs, Hungary (jones@gamma.ttk.pte.hu), (2) Environmental Analytical &Geoanalytical Laboratory, Szentágothai Research Centre, University of Pécs, Pécs, Hungary, (3) Geodetic and GeophysicalInstitute, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Sopron, Hungary, (4) Institutefor Geosciences, Johannes Gutenberg-University, Mainz, Germany, (5) Geographical Institute, Research Centre forAstronomy and Earth Sciences, Hungarian Academy of Sciences, Budapest, Hungary, (6) Institute of Applied Geology,BOKU, Vienna, AustriaGeochemical and mineralogical studies of paleosols provide essential information for paleoclimatic and pale-oenvironmental interpretation of continental deposits and can present a high-resolution proxy for paleoclimate.Consequently, paleosols can help to interpret the history of sediment deposition and the autogenic and allogenicprocesses that influenced a sedimentary basin. Paleosols are also helpful in stratigraphic studies, includingsequence stratigraphic analyses. They are used for stratigraphic correlations at the local and basinal scale, andsome workers have calculated sediment accumulation rates based on the degree of paleosol development. Thehorizons of paleosols are widely used as key horizons for the stratigraphic subdivision of continental sedimentaryseries.The reliability of usage of paleopedologic data has increased, especially with the development of methods ofabsolute and relative dating: radiocarbon, luminescent, paleomagnetic, amino acid, and paleontological (palyno-logical and paleofaunistic) with geochemical and clay mineralogical data. The use of paleosols as componentsof the stratigraphic record has increased, especially after paleosols morphotypical features of different ages werestudied. Paleosols in various sediment sections were once compound units of soil covers of different ages.Results from geochemical climofunctions applied to Upper Pliocene–Lower Pleistocene red clays and paleosolslocated in East-Central Europe (Austria, Slovakia, Hungary, Serbia and Romania) together with other geochemicaldata, clay mineralogy and fossil record, indicate that there were three major periods of their development.1. The older type red clay/paleosol (age ∼4.2–3.2 Ma) is red kaolinitic clay containing typically disordered kaoli-nite, mixed-layer smectite/kaolinite, smectite and little gibbsite. It was formed in the local subaerial weatheringcrust in warm, humid, subtropical or monsoon climate.2. The younger type (age ∼3.2–2.5 Ma) contains red (or "reddish") clay beds. It contains relatively fresh material(illite, chlorite), the weathering products are predominantly smectite and goethite formed under warm and drierclimate in environmental conditions of savannah and steppe or forest steppe.3. The basal red paleosol layer of the loess-paleosol series (age ∼1.0–0.5 Ma) contain similar material as the 2ndtype. The slightly but significantly lesser degree of weathering (more illite and chlorite, less smectite) indicatescooling of the climate.This contribution was made possible through financial support by ’Developing Competitiveness of Univer-sities in the South Transdanubian Region (SROP-4.2.1.B-10/2/KONV-2010-0002)’ and Austrian Agency forInternational Education & Research, financed by the Scholarship Foundation of the Republic of Austria (OeAD).It was additionally supported by the János Bolyai Research Scholarship of the Hungarian Academy of Sciencesfor G. Újvári.

Pedostratigraphy of pre-Quaternary/Quaternary red paleosols from Central Europe based on geochemical and clay mineralogical proxies

Abstract

Similar works

Full text

Available Versions

Repository of the Academy's Library