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关于岛弧体系的形成和发展,一直是举世瞩目的重大地质问题之一.板块学说问世以来,其重要性越发显得突出.冲绳海槽位于中国东海大陆架钓鱼岛隆褶带与琉球岛弧之间,地处弧后,呈弧形向东南方向凸出(图1),是环太平洋弧、沟体系中的一个扩张型半深海盆地.其沉积作用、火山活动和地史演化,与岛弧的发育过程关系密切,因此具有重要的研究价值.多年来,国外的许多研究单位和科学家,曾先后开展了包括地质学、海洋学和地球物理学等多方面的调查研究.我国的一些单位也开展了综合性的地质调查.本文仅就地质矿产部组织的两个航次的调查资料,对海槽沉积物的主要类型及其特征作一简略报导.所有资料,均由地质矿产部海洋地质调查局和海洋地质研究所联合组成的冲绳海槽地质调查队提供.调查工作是由《东方号》考察船完成的.使用W-33-CR-421IC型垂直探鱼仪测
The formation and development of the island arc system has always been one of the most important geological issues that attract worldwide attention.The plateau theory has become more and more prominent since the advent of the plate theory.The Okinawa Trough is located between the Longmen fold of the Diaoyu Island shelf and the Ryukyu Island arc in the continental shelf of China’s East China Sea, It is located in the arc and protrudes in the southeast direction (Figure 1), which is an expansive semi-deep basin in the arc-trench system of the Pacific Rim. Its sedimentation, volcanism and geosynclinal evolution are related to the development of island arc Process has a close relationship, so it has important research value.For many years, many foreign research institutes and scientists have carried out many investigations and studies including geology, oceanography and geophysics, etc. Some units in our country also carried out Comprehensive geological survey.This paper only makes a brief report on the main types and characteristics of sediment in the trough from survey data of two voyages organized by the Ministry of Geology and Mineral Resources.All informations are provided by the Bureau of Geology and Mineral Resources Marine Geological Survey and Marine Geology Institute of the Okinawa Trough Geological Survey team provided the survey was completed by the “East” study vessel using W-33-CR-421IC vertical fish finder