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Late pleistocene sedimentation history of the Shirshov Ridge, Bering Sea |
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| Authors: | M A Levitan T G Kuzmina V L Luksha I A Roshchina K V Syromyatnikov L Max D Nuernberg J -R Riethdorf R Tiedemann |
| Institution: | 19405. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, ul. Kosygina 19, Moscow, 119991, Russia 29405. Faculty of Geology, Moscow State University, Moscow, 119991, Russia 49405. AWI, Alfred Wegener Institute for Polar and Marine Research, Columbusstrasse, D-27568, Bremerhaven, Germany 39405. IFM-GEOMAR, Leibniz-Institut für Meereswissenschaften, Wischhofstr. 1-3, D-24148, Kiel, Germany |
| Abstract: | The analysis of the lithology, grain-size distribution, clay minerals, and geochemistry of Upper Pleistocene sediments from the submarine Shirshov Ridge (Bering Sea) showed that the main source area was the Yukon-Tanana terrane of Central Alaska. The sedimentary materials were transported by the Yukon River through Beringia up to the shelf break, where they were entrained by a strong northwestward-flowing sea current. The lithological data revealed several pulses of ice-rafted debris deposition, roughly synchronous with Heinrich events, and periods of weaker bottom-current intensity. Based on the geochemical results, we distinguished intervals of an increase in paleoproductivity and extension of the oxygen minimum zone. The results suggest that there were three stages of deposition driven by glacioeustatic sea-level fluctuations and glacial cycles in Alaska. |
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