东海表层沉积中的翼足类及其地质意义

PTEROPODS IN BOTTOM SEDIMENTS OF THE EAST CHINA SEA AND THEIR GEOLOGICAL IMPLICATION

对东海84个表层沉积中翼足类进行了定量分析,共获得7属15种,其中Limacinainflata在陆架外缘和上陆坡为优势种,Limacinatrochi formis,Creseisacicula和Creseis virgule在中外陆架最为丰富。根据翼足类的深度分布确定东海现代文石补偿深度在约600m水深处。以冲绳海槽北部柱状样B3GC为例,说明翼足类是研究地质时期古海洋学变化的重要证据。

A total of 15 species belonging to 7 genera were recognized from 84 samples of surface sediments of the East China Sea （ECS）. Limacina inflata is the dominant species on the outer margin of thecontinent shelf and theupper slope, and Limacina trochiformis, Creseis acicula and Creseis virgula are the most abundant on the middleouter shelf. According to the depth distribution of pteropod abundance the modern aragonite compensation depth was determined at some 600 m water depth in ECS. Core B-3GC from northern Okinawa Trough was studied in order to demonstrate the significance of pteropods in paleoceanographical studies.