Past sedimentation rates and environments of the Mendeleev Rise inferred from Sr isotope and δ18O chemostratigraphy of its Late Cenozoic sediments


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Аннотация

Multiproxy investigation of sediment core AF-0731 from the Mendeleev Rise revealed several epochs of high bioproductivity corresponding to climate amelioration and surface water mass warming in the Arctic. During these periods, sediments became enriched in carbonate microfossils as well as in coarsegrained ice- and iceberg-rafted debris (IRD) that precipitated from melting sea ice and icebergs. Variability in the δ18О composition of planktic foraminifers also reflects glacial-interglacial periodicity. Low δ18О values correspond to glacial epochs and, especially, glacial terminations with strong meltwater inputs. Increased δ18О values characterize interglacial epochs of sea-level rise and growing salinity due to enhanced water exchange with neighboring oceans. The 87Sr/86Sr ratio was measured in foraminifers from basal core layers, and their SIS-age was estimated at 670 + 50 ka. Sedimentation rates at AF-0731 core site on the Mendeleev Rise varied between 0.4 and 0.6 cm/kyr.

Авторлар туралы

E. Gusev

Gramberg VNIIOkeangeologia

Хат алмасуға жауапты Автор.
Email: gus-evgeny@yandex.ru
Ресей, St. Petersburg, 190121

A. Kuznetsov

Institute of Precambrian Geology and Geochronology

Email: gus-evgeny@yandex.ru
Ресей, St. Petersburg, 199034

E. Taldenkova

Moscow State University

Email: gus-evgeny@yandex.ru
Ресей, Moscow

S. Nikolaev

Moscow State University

Email: gus-evgeny@yandex.ru
Ресей, Moscow

A. Stepanova

Texas A&M University

Email: gus-evgeny@yandex.ru
АҚШ, College Station

E. Novikhina

Gramberg VNIIOkeangeologia

Email: gus-evgeny@yandex.ru
Ресей, St. Petersburg, 190121

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