Strategy of valid 14C dates choice in syngenetic permafrost

Vasil'chuk, Y.K.; Vasil'chuk, A.C.

Авторы: Vasil'chuk Yu K., Vasil'chuk A.C.
Журнал: Cryosphere Discussions
Том: 8
Год издания: 2014
Издательство: Copernicus GmbH on behalf of the European Geosciences Union
Местоположение издательства: Germany
Первая страница: 5589
Последняя страница: 5621
DOI: 10.5194/tcd-8-5589-2014
Аннотация: The main problem of radiocarbon dating within permafrost is the uncertain reliability of the 14C dates. Syngenetic sediments contain allochthonous organic deposit that originated at a distance from its present position. Due to the very good preservation of organic materials in permafrost conditions and numerous re-burials of the fossils from ancient deposits into younger ones the dates could be both younger and older than the true age of dated material. The strategy for the most authentic radiocarbon date selection for dating of syncryogenic sediments is considered taking into account the fluvial origin of the syngenetic sediments. The re-deposition of organic material is discussed in terms of cyclic syncryogenic sedimentation and also the possible re-deposition of organic material in subaerial-subaqueous conditions. The advantages and the complications of dating organic micro-inclusions from ice wedges by the accelerator mass spectrometry (AMS) method are discussed applying to true age of dated material search. Radiocarbon dates of different organic materials from the same samples are compared. The younger age of the yedoma from cross-sections of Duvanny Yar in Kolyma River and Mamontova Khayata in the mouth of Lena River is substantiated due to the principle of the choice of the youngest 14C date from the set.
Добавил в систему: Васильчук Алла Константиновна

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