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南海北部盛冰期以来古海洋环境变化的沉积记录

, PP. 52-58

Keywords: 南海,U37k-SST,转换函数,古海洋环境

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Abstract:

利用气候替代指标U37k-SST,浮游有孔虫Globigerinoidesruber的δ18O,δ13C,微体古生物种群变化、陆源和生源组分以及沉积物粒径等,对南海北部69孔沉积物进行综合研究.结果表明U37k-SST在冰后期为23.3~26.9℃,在末次盛冰期时为22.2~23.8℃.用浮游有孔虫转换函数法对季节温差进行估算,在冰后期为4.5~7.0℃,在末次冰期为7.0~9.0℃,两种估温法均反映了古气候变化相应的海水表层温度.69柱沉积物地层记录在末次盛冰期浮游有孔虫温带优势种Neogloboguadrinapachyderma和营养种Neogloboguadrinadutertrei丰度一致增加;热带优势种Pulleniatinaobliqueloculata和Globigerinoidesacculifer以及超微化石丰度则相应减少,而冰后期则相反.浮游有孔虫、钙质超微化石组成和数量的改变也为古海洋温度升、降提供了直接的证据.研究还表明南海北部冰后期以河流搬运为主,末次盛冰期时以风力搬运占优势,这反映了冬季风强化.

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