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对冲绳海槽南部 2 5 5柱状样的 6 5个样品进行放射虫定量研究 .根据属种分布和Q型因子分析结果 ,冲绳海槽南部近 2 0ka来出现过 3个不同的放射虫组合 ,冰期的Tetrapylequadriloba组合与表层高生产力和沉积物中富有机碳含量有关 ,冰后期的Carposphaeraglobosa组合和Polysoleniaspinosa组合对应于较低的表层生产力 .而放射虫碎壳率的变化显示冰后期SiO2 的溶解作用较冰期强 .
According to the genera distribution and Q-factor analysis, three different radiolarian assemblages appeared in the southern Okinawa Trough in the past 20 ka, The combination of Tetrapylequadriloba in glacial stage is related to the high productivity of the surface layer and the organic carbon content in the sediments, and the combination of Carposphaeraglospora and Polysoleniaspinosa in the late glacial stage corresponds to the lower surface productivity. Strong ice age.