A geological cross section of Neogene to Quaternary sediments in the Larsemann Hills, East Antarctica

Demidov, N.; Verkulich, S.; Pushina, Z.; Rivkina, E.; Shmelev, D.; Zanina, O.; Belova, N.; Melles, M.; Rethemeyer, J.

Авторы: Demidov Nikita, Verkulich Sergey, Pushina Zinaida, Rivkina Elizaveta, Shmelev Denis, Zanina Oksana, Belova Natalya, Melles Martin, Rethemeyer Janet
Журнал: Polar Science
Год издания: 2025
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Номер статьи: 101214
DOI: 10.1016/j.polar.2025.101214
Аннотация: Drilling of 5 holes between the lakes Reid and Nella in the Larsemann Hills oasis of East Antarctica revealed up to 15 m thick Neogene - Quaternary deposits above bedrock. Laboratory analyses comprise cryolithological, geochemical, and micropaleontological investigations, as well as radiocarbon (14C) dating. The lowermost sediments according to key biostratigraphical taxa are of early Pliocene age and were deposited in shallow marine conditions. This unit is overlain by sediments, which according to 14C dating were deposited ca. 48.1–29.6 ka BP. Their formation in lacustrine-marine conditions, as reflected by results of multi-proxy laboratory studies, suggests that the relative sea level during Marine Isotope Stage 3 has been at least 32 m higher than present, in order to allow lagoon-type deposition, when fresh lake water mixed with sea water during high tides, or near coastal marine sedimentation, when sea water mixed with melt water from adjacent glaciers. The sediments at the top of the record are tills, consisting of a lateral moraine and an end moraine. Their distribution marks the extend of the last glaciation in the area, with ice masses moving northward during the pre-Antarctic Cold Reversal glaciation 14 ka BP, or during a minor Holocene ice advance.
Добавил в систему: Белова Наталия Геннадиевна

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A geological cross section of Neogene to Quaternary sediments in the Larsemann Hills, East Antarcticaстатья Исследовательская статья