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Paleopedologický výzkum nového sprašového záznamu svrchního pleistocénu v Brně-Bohunicích

Title in English Palaeopedologic research of a new Upper Pleistocene loess-palaeosol record in Brno-Bohunice


Year of publication 2021
Type Article in Periodical
Magazine / Source Geoscience Research Reports
MU Faculty or unit

Faculty of Science

Keywords Upper Pleistocene; palaeopedology; soil micromorphology; physical and chemical proxies
Description A number of important loess sites have been discovered in the area of the Brno-Bohunice district. Most of them are related to archaeological research, and apart from Karel Valoch work, their palaeopedological record has not been studied in detail. A new loess section exposed by the recent construction works in Brno-Bohunice provides an opportunity for a comprehensive multiproxy evaluation of the Upper Pleistocene loess-palaeosol record. This work provides a complex information on palaeoenvironment and soil development using a combined approach, including micromorphological observations and physical, anthracological, malacological, and geochemical data along with radiocarbon dating. The excavated section Brno-Bohunice 2018 (49,1773775N; 16,5749161E), approximately 400cm in thickness, was divided into ten lithostratigraphic units: loess (units 6 and 1), soil horizons (units 5, 4, 2c, 2b and 2a) and a colluvium (units 3c, 3b and 3a). The basal loess was probably deposited before the Last Glacial Period (MIS 6 or older). The overlying Bt horizon of luvisol was probably developed in the Eem Interglacial and the chernozem in the Early Glacial period (both in MIS 5). The loess-palaeosol sequence is followed by colluvial deposits of unknown age, plausibly resulting from both traction and, frost-related processes. Bw horizon of cambisol affected by secondary gleying process developed from the upper part of the colluvium. Radiocarbon dating (45,004–43,344 and 43,350–42,346 cal BP) indicates that this palaeosol belongs to some of MIS 3 interstadials, as does the overlaying reductaquic horizon of tundra gley. Both palaeosols were affected by freezing processes. The MIS 3 soil complex terminates by the uppermost regosol, which is covered by loess deposited in MIS 2 (27,302–26,463 cal BP). Our research has shown that the palaeosol development in the Brno-Bohunice area is more complex than expected.

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