Absence of large-scale ice masses in central Northeast Siberia during the Late Pleistocene

0573082 - GFÚ 2024 RIV US eng J - Článek v odborném periodiku
Nørgaard, J. - Margold, M. - Jansen, John D. - Kurbanov, R. - Szuman, I. - Andersen, J. L. - Olsen, J. - Knudsen, M. F.
Absence of large-scale ice masses in central Northeast Siberia during the Late Pleistocene.
Geophysical Research Letters. Roč. 50, č. 10 (2023), č. článku e2023GL103594. ISSN 0094-8276. E-ISSN 1944-8007
Institucionální podpora: RVO:67985530
Klíčová slova: mountain glaciers * glacial moraines * boulder erratics * exposure dating * cosmogenic nuclides * ice sheet
Obor OECD: Geology
Impakt faktor: 5.2, rok: 2022
Způsob publikování: Open access
https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2023GL103594

Ongoing speculation regarding the existence of large Late Pleistocene ice masses in Northeast Eurasia reflects the dearth of age constraints on glaciations across this vast region. Here, we report the first dates from the central part of Northeast Siberia, consisting of 22 cosmogenic Be-10 exposure ages from boulders deriving from a sequence of three moraines in the Chersky Range. The dated moraine sequence indicates progressive contraction of maximum glacier extent from Marine Isotope Stage 6 to the Last Glacial Maximum, while the remotely-sensed mapping indicates an older, more expansive glaciation in the region yet undated. Our results show that Late Pleistocene glaciations were limited to the highlands, and Northeast Siberia did not host a large, coalescent ice sheet during the Last Glacial Maximum or Marine Isotope Stage 6.
Trvalý link: https://hdl.handle.net/11104/0343606