Short-term soil formation events in last glacial east European loess, evidence from multi-method luminescence dating

• Published in: Quaternary Science Reviews
• Main Authors: Veres, Daniel, Tecsa, Viorica, Gerasimenko, Natalia, Zeeden, Christian, Hambach, Ulrich, Timar-Gabor, Alida
• Other Authors: Institute of Speleology, Romanian Academy, Babes-Bolyai University Cluj-Napoca (UBB), Taras Shevchenko National University of Kyiv, Institut de Mécanique Céleste et de Calcul des Ephémérides (IMCCE), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Lille-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Universität Bayreuth
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2018
• Subjects: Luminescence dating; Loess; MIS 2 embryonic soils; Climate dynamics; Eastern Europe; Millennial-scale loess records; Embryonic soils; Pleistocene; [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology; [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy; Greenland; Greenland ice core; ice core
• Online Access: https://hal.archives-ouvertes.fr/hal-02319212; https://hal.archives-ouvertes.fr/hal-02319212/document; https://hal.archives-ouvertes.fr/hal-02319212/file/1-s2.0-S0277379118302804-main.pdf; https://doi.org/10.1016/j.quascirev.2018.09.037

International audience Here we provide a robust luminescence chronology for Stayky (Ukraine), a reference profile in European Late Pleistocene loess stratigraphy, based on optically stimulated luminescence (OSL) dating on quartz (4-11 μm, 63-90 μm) and post infrared-infrared stimulated luminescence (pIR-IRSL)) on polymineral fine grains. For the Bug loess unit, the equivalent of Marine Isotope Stage (MIS 2), results are in agreement between methods, demonstrating that the suite of embryonic soils previously interpreted as reflecting climate variability similar to Greenland interstadials (GI) actually date to ∼29/27-15 ka, with most emplaced around or after 20 ka. This temporal span is further confirmed by age-depth modelling of available data. Apart from GI-2, no interstadial-type climate events are recorded in Greenland ice core data for that time interval. As short-term pedogenetic phases are also documented in records from central-western Europe, there is a need for more research into the European mid-latitude terrestrial environments response to MIS 2 hydroclimate variability. The dating of Vytachiv paleosol, previously debatably linked to various GI events within MIS 3 resulted in ages of ∼40 ± 4 ka and ∼53 ± 4 ka at the lower transition, and ∼26 ± 2 ka to ∼30 ± 2 ka in the overlying loess. These ages indicate that the truncated Vytachiv paleosol is either not continuous, or that it encompasses a broader age range within MIS 3 than previously considered. In both cases, data would not allow for an unambiguous linking of this paleosol with specific GI events as previously attempted. The pIR-IRSL290 dating of the loams immediately underneath Pryluky unit in the range of ∼120 ka to ∼168 ka and of the Pryluky mollisol from ∼90 ka to 126 ka confirm the broad correspondence of this unit with MIS 5, although poor dose recovery results open the possibility for further testing on the degree these ages provide overestimated results. Quartz data severely underestimate the pIR-IRSL290 ages for these samples. The ...