Isotope age and relative abundance of planktonic foraminifera in Core Vulk-34-90, Sea of Okhotsk

Based on analyses of taxonomic composition of planktonic foraminifera and oxygen isotopic composition of their shells in the sediment core V34-90 from the eastern slope of the USSR Academy of Sciences Rise in the southeast Sea of Okhotsk the main climatic and hydrological variations over the past 20 Ka have been traced and dated by the radiocarbon method. The followed periods have been revealed: glacial (20-12.5 Ka), deglaciation (12.5-8.0 Ka) with a pronounced cooling event (Late Drias about 10.8 Ka) and post deglaciation (last 8.0 Ka).

本研究基于对鄂霍次克海东南部苏联科学院海隆（USSR Academy of Sciences Rise）东侧V34-90沉积物岩芯（sediment core）中浮游有孔虫（planktonic foraminifera）分类组成及其壳体氧同位素组成的分析，并通过放射性碳定年法（radiocarbon method）对岩芯进行定年，重建了过去2万年以来的主要气候与水文变化过程。研究识别出以下三个演化阶段：冰期（20~12.5千年前）、伴随显著降温事件（约10.8千年前的晚德赖阿斯期（Late Drias））的冰消期（12.5~8.0千年前），以及冰消后期（近8.0千年前至今）。