Palaeopedologic research of a new Upper Pleistocene loess-palaeosol record in Brno-Bohunice
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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 400 cm 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.References