层序IV，在陆坡和岛弧地区都有分布，但是在海槽盆地内部区域缺失该层序，为上新世沉积物。
We found that sequence IV, which is Pliocene sediments, only exists in the slope and island arc slope and not distributes in the trough basin.
本区古地理的演变过程是：由更新世的陆地环境，经过全新世的海侵，变为现今的滨海环境。
The process of paleogeographic evolution in this area is from land of pleistocene epoch to ingression of holocene epoch, then to littoral circumstances of today.
沉积物粒度数据的端员分析结果表明，冲绳海槽北部全新世沉积物中的硅酸盐碎屑是由陆源碎屑物质和火山灰按不同的比例混合而成的。
It is shown from the analysis results of grain size data that the sediments from the northern Okinawa Trough are mixture of terrigenous materials and volcanic ash during the Holocene epoch.
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