中文摘要：

对取自冲绳海槽中部的Z14-6岩心进行了钙质超微化石的鉴定统计和有孔虫的氧碳稳定同位素分析,在利用浮游有孔虫氧同位素曲线对比进行地层划分的基础上,通过与邻近区域3个岩心数据进行对比,分析了150kaBP以来该海区钙质超微化石下透光带属种Florisphaera profunda百分含量变化特征及其受控机制。研究结果表明,MIS 6期以来F.profunda百分含量变化具有明显的冰期-间冰期旋回特征,末次冰期旋回中,冰期时F.profunda百分含量低于间冰期,倒数第二次冰期旋回中正好相反。F.profunda百分含量变化的主控因子是黑潮流的强弱变化,倒数第二次冰期旋回中F.profunda百分含量从MIS 5e期末开始降低,由此推测黑潮从MIS 5e期末开始减弱或向洋外偏移,沿岸水入侵冲绳海槽。

英文摘要：

Core Z14-6(27°07′N,127°27′E,and water depth 739 m) retrieved from the central Okinawa Trough was selected for planktonic foraminifera and calcareous nannofossil study.On the comparison with SPECMAP δ18O the stratigraphy of Z14-6 was established.By contrast with data of three adjacent cores,the variations and control factors of percent content of Florisphaera profunda in this region during the last 150 ka BP were discussed.Results showed that the variations of percent content of F.profunda since MIS 6 were c...