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冲绳海槽北起日本列岛以南,南至台湾东北海域,东邻琉球群岛,西接我国东海大陆架.海槽是一个呈北东-南西向延伸,并向东南突出的弧形深水槽,主体水深大于1000米.1980年、1981年我们对冲绳海槽北纬24°26′至30°53′,东经123°03′至129°07′范围分别进行了两个航次调查(图1),编写了航次调查报告和研究报告.在此基础上,对冲绳海槽沉积物中283个表层和柱状样作了轻、重矿物研究.研究所用粒级为0.25—0.063毫米,采用双目镜和偏光镜鉴定,重部分用颗粒法定量,轻部分用目估体积法定量.研究
The Okinawa Trough is from the south of Japan to the south, to the northeast of Taiwan in the north, to the Ryukyu Islands to the east and to the continental shelf of China’s East China Sea to the west. The trough is an arc-shaped deep trough that extends from the north east to the southwest and protrudes southeastwards. The water depth is more than 1000 meters. In 1980 and 1981, we carried out two voyage surveys on the Okinawa Trough from latitude 24 ° 26 ’to 30 ° 53’ and longitude 123 ° 03 ’to 129 ° 07’ (Figure 1) A voyage investigation report and a research report were put forward.On this basis, 283 surface and columnar samples from the sediments of the Okinawa Trough were studied for light and heavy minerals.The size of the study was 0.25-0.063 mm, with binocular and polarizing Mirror identification, heavy part by particle method for quantitative, light part of the quantitative method by volume estimation