globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2014.11.024
论文题名:
An integrated rock-magnetic and geochemical approach to loess/paleosol sequences from Bohemia and Moravia (Czech Republic): Implications for the Upper Pleistocene paleoenvironment in central Europe
作者: Hošek J.; Hambach U.; Lisá L.; Grygar T.M.; Horáček I.; Meszner S.; Knésl I.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 418
起始页码: 344
结束页码: 358
语种: 英语
英文关键词: Central Europe ; Geochemical proxies ; Loess/paleosols sequences ; Paleoclimate ; Rock-magnetism ; Upper Pleistocene
英文摘要: Two central European loess/paleosol sequences (MIS 6-2), from central Bohemia (Zeměchy) and southern Moravia (Dobšice), situated in the important climatic transition zone between the oceanic (Atlantic) and continental climate regimes, were investigated for rock magnetism, geochemistry, grain size and micromorphology. In both sites the magnetic profile shows good agreement with the standard model of magnetic enhancement in paleosols as established in the Chinese loess. The magnetic signal is dominated by the presence of fine-grained magnetite and maghemite, formed in-situ and controlled by the intensity of soil formation. Magnetic proxies corresponded to proxies of chemical weathering and leaching intensity such as the Chemical Index of Alteration (CIA), the Cation Exchange Capacity (CEC) and the Rb/Sr ratio (correlation coefficient r. = ~. 0.6-0.93) during the whole Lower Weichselian (MIS 5d-5a) and, in general, also during the Pleniglacial (MIS 4-2). Nevertheless, for the Eemian period (MIS 5e) this relationship was not always valid, either due to weak magnetic enhancement (at Dobšice) or even weak depletion of the magnetic minerals with soil formation (at Zeměchy). The presented data demonstrate that magnetic signals can be overprinted more easily than chemical proxies during later diagenetic events, and are hence not in all cases reliable for deciphering paleoclimate changes during all periods of the studied time interval. Rock-magnetic, geochemical and micromorphological results suggest drier conditions in southern Moravia compared to central Bohemia during the Weichselian Glacial, probably due to the more continental climate in southern Moravia. © 2014 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69072
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作者单位: Czech Geological Survey, Klárov 3, Prague 1, Czech Republic; BayCEER and Chair of Geomorphology, University of Bayreuth, Bayreuth, Germany; Institute of Geology of Czech Academy of Science, Rozvojová 269, Prague 6, Czech Republic; Institute of Inorganic Chemistry of Czech Academy of Science, Řež, Czech Republic; Department of Zoology, Faculty of Science, Charles University, Viničná 7, Prague 2, Czech Republic; Dresden University of Technology, Institute of Geography, Mommsenstrasse 7, Dresden, Germany; Institute of Geology and Paleontology, Faculty of Science, Charles University in Prague, Albertov 6, Prague 2, Czech Republic

Recommended Citation:
Hošek J.,Hambach U.,Lisá L.,et al. An integrated rock-magnetic and geochemical approach to loess/paleosol sequences from Bohemia and Moravia (Czech Republic): Implications for the Upper Pleistocene paleoenvironment in central Europe[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,418
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