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DEPOSITIONAL CHARACTERISTICS OF BIOGENIC SEDIMENTS AND THEIR PALEOCEANOGRAPHIC IMPLICATIONS IN THE WEST PACIFIC WARM POOL DURING PLEISTOCENE
Author(s): 
Pages: 67-72
Year: Issue:  4
Journal: MARINE GEOLOGY & QUATERNARY GEOLOGY

Keyword:  生源沉积物表层生产力更新世西太平洋暖池;
Abstract: 赤道西太平洋暖池区中部柱状样MD972140中钙质超微化石氧同位素记录和生物地层学的研究为该柱提供了可靠的年龄框架.氧同位素记录与生源和非生源组分的对比表明,粗组分和碳酸钙含量变化表现为冰期降低,间冰期升高,类似于大西洋型旋回,而蛋白石和非生源组分却与之相反.更新世以来粗组分和碳酸钙含量的变化总体上是由高到低,而蛋白石和非生源组分含量的变化是由低到高,反映了陆源物质输入量和表层水生产力的增加.由此可见,碳酸钙和蛋白石含量的变化主要受到钙质和硅质生物生产力以及陆源物质输入量的控制.氧同位素7期以来,蛋白石含量和硅质微体化石丰度在冰期升高及在间冰期降低的变化反映了表层水生产力的波动和硅质溶解作用的强弱.
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