南海S08-57站柱样岩心地球化学特征及古海洋学意义

Geochemical characteristics of core S08-57 in South China Sea and their paleoceanographic significance

对南海S08-57站柱样岩心的CaCO3、SiO2、Al2O3、TFe2O3、MgO、CaO、Na2O、K2O、TiO2、P2O5、MnO、Cu、Pb、Zn、Co、Ni、Ba、Sr、Rb、V、Cr、La、Ce和Ta的含量变化进行了分析;根据CaCO3含量变化建立了碳酸钙地层时标,提出了南海碳酸钙地层学的SB4.0事件,进一步完善了南海标准碳酸钙地层学时标;讨论了沉积物地球化学特征及古海洋学意义。结果表明,S08-57柱样岩心的SB3.33m事件附近存在一次强碳酸盐沉积,Al2O3、TiO2、Nb、SiO2、K2O、Ta、La、Rb、Ce、MgO、Zn、TFe2O3、Na2O、V、Pb和Cr的沉积曲线与CaCO3近似呈镜像关系。

The contents of CaCO3, SiO2, Al2O3, TFe2O3, MgO, CaO, Na2O, K2O, TiO2, P2O5, MnO, Cu, Pb, Zn, Co, Ni, Ba, St, Rb, V, Cr, La, Ce and Ta in the sediment samples from the core S08-57 in the South China Sea were analyzed to study their paleoceanographic significance. According to the content change of calcium carbonate, the authors established a CaCO3 chemostratigraphy and brought forward an event named SB4.0 of the South China Sea, making a further development of the standard CaCO3 chemostratigraphy of the South China Sea. The authors also discussed the geochemical characteristics and their paleoceanographic implications of the core S08-57. The results showed that there existed a strong CaCO3 sediment event at SB3.33m, and the sedimentary curves of Al2O3 , TiO2, Nb, SiO2, K2O, Ta, La, Rb,Ce, MgO, Zn, TFe2O3, Na2 O, V, Pb and Cr are very similar, all showing an enantiomorphous relation to CaCO3.