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南海北部晚第四纪高分辨率元素比值反映的东亚季风演变
  • 摘要

    选取大洋钻探ODP 184航次在南海北部钻取的1144站(20°3.18'N,117°25.14'E;水深2037m)上部岩芯为研究材料.通过X荧光光谱(XRF)岩芯扫描仪获取晚第四纪100ka以来时间分辨率高达10年的元素记录,并与德国"太阳号"95航次在同一站位获得的17940-2柱状样(20°07.0'N,117°23.0'E;水深1728m)的相关数据(包括底栖有孔虫Uvigerina+Bulimina的丰度、有机碳通量和粘土含量)进行比较,发现Ba/Ti和K/Al比值可以分别反映表层生产力和陆地化学风化的变化,且都具有明显的岁差和半岁差周期,呈现典型的热带气候特征,可能与东亚夏季风的变化有关.特别是,Ba/Ti和K/Al比值还具有类似D/O事件的千年尺度(1.4~2.0ka)周期和与太阳活动相关的百年尺度(约200a和500a)变化周期,且其千年尺度的变化特征在形态上更接近于南极冰芯中的氧同位素记录,反映了低纬海区与南半球高纬区的古气候联系.

  • 作者

    金海燕  翦知湣  谢昕  田军  Jin Haiyan  Jian Zhimin  Xie Xin  Tian Jun 

  • 作者单位

    同济大学海洋地质国家重点实验室,上海,200092

  • 刊期

    2011年2期 ISTIC PKU

  • 关键词

    南海北部  Ba/Ti  K/Al  表层生产力  陆地化学风化  东亚夏季风  晚第四纪 

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