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中文摘要：
通过对南海西部越南岸外MD05—2901孔的有孔虫氧同位素测定，建立了450ka以来高分辨率的年代地层．结合沉积物的密度、孔隙率和陆源碎屑含量，计算了陆源碎屑的堆积速率，结果显示在间冰期时堆积速率的平均值为4．9～6．0g／（cm^2.ka），高于冰期的1．9～5．0g／（cm^2.ka），-9发表过的南海南、北部冰期高于间冰期的特点明显不同．对陆源沉积物的粒度分布进行主成分因子分析，获得了两个主控因子F1和F2，它们控制了陆源沉积近80％的粒度变化特征．对F1敏感的1．26～2．66μm％和10．8～14．3μm％呈现高频的波动，和北半球低纬夏季太阳辐射量吻合很好，显示23ka的岁差周期和13ka的半岁差周期．对F2敏感的4．24～7．42μm％和30．1～43．7μm％，则显示强烈的100ka的偏心率周期．本区的陆源沉积物来源于南海西南和北部2个地区，在动力上则分别由夏季风和冬季风驱动的不同方向的洋流搬运．研究认为，晚第四纪以来东亚夏季风受控于低纬区的夏季日射量的变化，而冬季风主要受高纬冰盖变化驱动，呈冰期／间冰期旋回尺度的波动，这反映了东亚季风演化的双重驱动机制．
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