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白令海和楚科奇海表层沉积中的有孔虫及其沉积环境

, PP. 85-93

Keywords: 白令海和楚科奇海,有孔虫,表层沉积,碳酸盐溶解,水团

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Abstract:

通过对白令海和北冰洋楚科奇海39个表层沉积样品中有孔虫的定量分析,发现表层沉积中浮游有孔虫稀少可能与该区表层生产力低、碳酸盐溶解作用较强有关,而底栖有孔虫的分布则主要受表层初级生产力以及与水深相关的碳酸盐溶解作用和水团性质所控制,其中北冰洋楚科奇海陆架区有孔虫以Elphidiumspp.组合和Nonionellarobusta组合为主,丰度和分异度低,受北冰洋沿岸水团控制;白令海陆坡区有孔虫以Uvigerinaperegrina-Globobuliminaaffinis组合为主,含N.robusta较多,丰度和分异度相对高,受太平洋中层和深层水团控制,但该区碳酸盐溶跃层和补偿深度(CCD)相对浅,约分别位于2000和3800m处.此外,白令海陆坡上部表层沉积中含有北冰洋陆坡区典型深水底栖有孔虫种Stetsoniaarctica,说明白令海峡两侧的海区曾有深部水交流.

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