南海北部陆坡深水区新生代沉积演化东西部对比分析Contrastive Analysis on the Sedimentary Evolution in the Deep Water Areas from West to East, Northern South China Sea
谢辉,区浩瑛,石红才,孔德明
摘要(Abstract):
【目的】研究南海北部陆坡深水区新生代沉积演化在陆缘东部和西部的异同。【方法】利用珠江口盆地深水区和琼东南盆地深水区钻井和地震勘探资料,通过回剥分析,重建两沉积盆地深水区的去压实沉积厚度和沉积速率变化并进行对比分析。【结果】两沉积盆地深水区的新生代都呈现幕式沉积演化的特征,大体可以划分为4幕。在29-23.03 Ma和19.8-11.9 Ma,珠江口盆地深水区的沉积速率明显大于琼东南盆地;而在8.2-0 Ma,尤其是3.2 Ma之后,情况相反。在23-19.8 Ma,两个盆地的深水区都表现出极低的沉积速率。【结论】南海北部陆缘深水区东西部的沉积演化在裂陷期基本近似,但是裂后期明显不同。珠江口盆地深水区裂后期沉积演化主要受到珠江流域变化、白云运动和亚洲季风强弱控制,而琼东南盆地深水区裂后期沉积演化主要受到红河物源、海南岛物源、红河断裂右旋走滑和亚洲季风强弱控制。
关键词(KeyWords): 南海北部;陆坡深水区;回剥分析;沉积演化
基金项目(Foundation): 国家自然科学青年基金(41606065);; 广东省自然科学基金(2016A030310331);; 中国科学院边缘海地质重点实验室开放基金(MSGL15-02);; 广东海洋大学博士启动基金项目;广东海洋大学海洋科学科研团队项目(002026002004)
作者(Author): 谢辉,区浩瑛,石红才,孔德明
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