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本文研究了冲绳海槽四个站位柱状岩芯中的放射虫。所有样品均为本所近几年来进行东海沉积调查时所取。站位的水深为602—1900米,柱状样长1.7—2.4米(取样站位见图1)。其中笔者对两个柱子(7015,补7)的放射虫作了全群定量分析。在另外两个柱子中,则仅对某些有环境和地层意义的特定分类单位进行了定量分析。共鉴定放射虫149属,238种。根据这些放射虫的分布规律,特别是通过对“放射虫气候指数”(即Tr值)的计算,探讨了冲绳海槽约15万年以来的气候演变和沉积层序的划分。
In this paper, we studied the radiolarians in the columnar core of the four stations in the Okinawa Trough. All samples were taken by the institute in the East China Sea sediment survey in recent years. The station depth of 602-1900 meters, column-like length of 1.7-2.4 meters (sampling station see Figure 1). One of the two columns (7015, make up 7) of the radioactive insects made a full quantitative analysis. In the other two columns, only certain taxa that have environmental and geological significance have been quantitatively analyzed. A total of 149 genera and 238 species of radioactive insects were identified. Based on the distribution of these radiolarians, the evolution of climate and the division of sedimentary sequence in the Okinawa Trough since about 150,000 years have been discussed, especially through the calculation of “Radiocomposite Climatic Index” (ie Tr value).