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本文利用取自冲绳海槽中部的Z_(14-6)。孔岩心中所含两种浮游有孔虫进行了氧同位素地层学研究。结果表明,该孔氧同位素记录可划分为6期,其中第5期又可分为5个亚期。与V_(28-238),V_(19-29)孔的氧同位素曲线对比发现,Z_(14-6)孔的氧同位素记录与大洋氧同位素记录完全一致,历时约12.8万年。同时,Z_(14-6)孔氧同位素记录指示出该区12万年来曾存在三个温暖时期。
In this paper, Z_ (14-6) taken from the middle of the Okinawa Trough is used. Two kinds of planktonic foraminifera contained in the pore core were studied by oxygen isotope stratigraphy. The results show that the pore oxygen isotope records can be divided into six phases, of which the fifth phase can be divided into five sub-phases. Compared with the oxygen isotope curves of V_ (28-238) and V_ (19-29), it was found that the oxygen isotope records of Z_ (14-6) well were exactly the same as those of the ocean oxygen isotope, which lasted for about 128,000 years. At the same time, Z_ (14-6) Oxygen isotope records indicate that there were three warm periods in this area for 12 years.