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

Adameková, Katarína; Petřík, Jan; Světlík, Ivo; Bíšková, Jarmila; Bajer, Aleš; Novák, Jan; Bíško, Richard

doi:10.3140/zpravy.geol.2021.03

Cited by 4 publications

(2 citation statements)

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“…As mentioned above, until now, only one relict frost wedge in the Czech Republic has been numerically dated; it developed at the transition of MIS 4 to 3 [59]. Other frost wedges were dated indirectly and probably corresponded to MIS 5d-5b [1,[60][61][62], MIS 3 [63], and MIS 2 [64][65][66]. The present study reveals that the investigated frost wedges in the Bohemian and Most basins developed during MIS 2 (Figure 3) and generally coincided with the time of frost-wedge formation in other central and western European lowlands in the final phase of the last glacial period (Figure 4).…”

Section: Paleo-environmental Implicationsmentioning

confidence: 99%

“…However, the only numerically dated relict frost wedge in the Czech Republic corresponds to the transition of MIS 4 to 3 [59]. Other indirectly dated frost wedges found in fluvial sediments or loess-paleosol sequences likely developed during MIS 5d-5b [1,[60][61][62], MIS 3 [63], or MIS 2 [64][65][66]. Consequently, there is a general lack of chronological data as well as an obvious disparity in the timing of relict frost wedges.…”

Section: Introductionmentioning

confidence: 99%

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Optically‐Stimulated‐Luminescence Ages and Paleo‐Environmental Implications of Relict Frost Wedges in North–Central Bohemia, Czech Republic

Uxa,

Křížek,

Krause

et al. 2024

Permafrost & Periglacial

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Relict frost wedges are widespread and valuable indicators of past environmental conditions that have been extensively dated across central and western European lowlands over the past few decades, but their timing in the Czech Republic is poorly known. Here, we present optically‐stimulated‐luminescence (OSL) ages for seven relict frost wedges situated at four study sites in north–central Bohemia, Czech Republic (49.9992–50.4956°N, 13.3736–16.0011°E, 230–350 m above sea level). The OSL ages indicate that the frost wedges developed during two phases in marine isotope stage 2: an older phase that peaked at 23.6 ± 2.9 ka and a younger phase that peaked at 16.1 ± 1.3 ka. Both phases probably experienced cold, dry and windy conditions that were mostly associated with <0°C mean annual air and ground temperatures and the presence of at least discontinuous permafrost, which is in line with similar central and western European records and other paleo‐environmental archives. The new OSL ages constitute the first extended dataset on the timing of frost wedges in this undersampled area between the Fennoscandian and Alpine ice sheets, which is essential for reconstructing past permafrost extents and climate conditions, as well as for validating models of past permafrost dynamics in central Europe.

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