Abstract: Terrigenous-biogenic fraction investigations have been performed on core 08BR02 collected from the Bering Basin, North Pacific Ocean, during the Third Chinese National Arctic Expedition. Depth-age model of this core is based upon age control points of AMS¹⁴C dating on organic carbon and platonic foraminifers, and correlation of the color b* in this core with NGRIP δ¹⁸O curve and color b* of four sediment cores in the North Pacific and Bering Sea. Sea ice extension history in the Bering basin over the last 17 ka is reconstructed by ice-rafted detritus (IRD), sand component and sensitive component (sized in 33-63 μm), which were carried by sea ice and iceberg, and increased during the H1, mid-B/A and YD periods. The IRD and foraminifera abundance in core 08BR02 increased simultaneously during the H1, mid-B/A and YD periods, which indicate the melt water enhanced surface water nutrient and then promoted planktonic foraminifera bloom, surface organic material deposited on the sea bottom provided nutrient for benthic foraminifers.

Key words: Bering Basin, last deglaciation, IRD(ice-rafted detritus), sea ice extension, foraminifera