一种位于岛弧内的盆地，经含富火山碎屑的沉积物为典型。
A basin situated within an island arc and typically containing sediments rich in volcanic debris.
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.
火山碎屑堆积物中的浮岩岩石化学分析结果表明岩浆成分为粗面质。
Petrochemistry analysis of pumice component indicates that the magma can be assigned to trachytic magma.
陆坡下部区的火山碎屑及浊流沉积物中放射虫化石亦不丰富。
In the low area of continental slope, radiolaria fossils are poor in the volcanic cinders and turbidite.
物源分析表明，无序间层粘土岩主要由中性火山碎屑（岩）在原地蚀变、转化而成，而有序间层粘土岩则是由酸性岩蚀变而成。
The results show that the disordered and ordered clay rocks are respectively formed by intermediate and acidic pyroclasts in the sedimentary basins.
主要论述了这次大爆发的火山喷发碎屑堆积物的层序和分布。
The author deals with mainly the sequence and distribution of the pyroclastic deposits of the 800 a. B. P. eruptions.
主要论述了这次大爆发的火山喷发碎屑堆积物的层序和分布。
The author deals with mainly the sequence and distribution of the pyroclastic deposits of the 800 a. B. P. eruptions.
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