冲绳海槽南部表层沉积中的浮游有孔虫及其地质意义
Planktonic Foraminifera in the surface sediments of the southern Okinawa Trough and its geological significance
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摘要: 对冲绳海槽南部53个表层沉积样品中大于0.154mm的浮游有孔虫进行系统鉴定和定量统计,并采用Q型因子分析,求得浮游有孔虫各属种和组合的分布特征:N.Dutertei－p.Obliquiloculata组合主要分布在离大陆和台湾岛较近的地方,而G.Glutinata－G.Ruber组合则主要分布在冲绳海槽的中央及靠琉球岛的一侧,且发现浮游有孔虫丰度、属种组合和碎壳率等的分布和变化主要受控于水深、碳酸盐溶跃层、温跃层以及水团等各类环境因子.Abstract: Systematical identifying and quantitative counting of planktonic Foratninifera(>0.154 mm) have been carried out for 53 surface sediment samples in the southern Okinawa Trough,The distributional characteristics of each species and assemblage of planktonic Foraminifera are obtained using Q-mode factor analysis,N,dutertrei-P,oblzquiloculata assemblage is mainly distributed in the sea area near The Mainland and Taiwan,China,while G.glutznata-G,Tuber assemblage is distributed in the central part and the Ryūkyū-gunto side of the Okinawa Trough,Moreover,it is found that the distribution and variation of planktonic foraminiferal abundance,assemblage and fragmentation are mainly controlled by the environmental factors such as water depth,carbonate lysocline,thermocline and water masses.
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Key words:
- Planktonic Foraminifera /
- surface sediment /
- environmental factors /
- Okinawa Trough
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