Keywords the Okinawa Trough,calcareous nannonfossils,benthonic foraminifera,suface water structure,fresh water influx,Palaeo-Kuroshio Current evolution,deep-water evolution,dissolution,oxygen isotope;

• 冲绳海槽;钙质超微化石;底栖有孔虫;表层海水结构;冲淡水;古黑潮演化;深部水团变迁;溶解作用;氧同位素;