Analysis of the late Pleistocene cyclic ice wedge complexes in the Mayn River Valley ...
We studied the structure and composition of Late Pleistocene cyclic ice wedge complexes in the Mayn River Valley and syngenetic ice wedges in adjacent areas of the Southern Chukchi Peninsula. Analysis of stable isotopes (δ18O and δD) and major ion chemistry of ice, as well as radiocarbon ages and po...
| Main Authors: | , |
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| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
PANGAEA
2020
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.1594/pangaea.915033 https://doi.pangaea.de/10.1594/PANGAEA.915033 |
| Summary: | We studied the structure and composition of Late Pleistocene cyclic ice wedge complexes in the Mayn River Valley and syngenetic ice wedges in adjacent areas of the Southern Chukchi Peninsula. Analysis of stable isotopes (δ18O and δD) and major ion chemistry of ice, as well as radiocarbon ages and pollen spectra of the host sediments, allowed detailed quantitative evaluation of changes in Late Pleistocene permafrost and climate conditions of the area, between 38 and 12 Kyr BP. The study has confirmed the previous inference that winters were much colder than now in the latest Pleistocene and rather severe during the Holocene optimum. The sediments have been dated by the radiocarbon (14C) method (Kotov and Ryabchun, 1986) in Magadan (North East Science Center, Far East Branch, Russian Academy) , which places exact time constraints on the yedoma history. Winter mean (twint.mean) and January (tJ) air temperature means for the Southern Chukchi Peninsula were inferred by comparing the oxygen isotope composition of ... : Data was submitted and proofread by Yurij K Vasil'chuk and Lyubov Bludushkina at the faculty of Geography, department of Geochemistry of Landscapes and Geography of Soils, Lomonosov Moscow State University. ... |
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