摘要
珠江口盆地是南海北部大陆边缘新生代发育起来的裂陷型盆地,蕴藏丰富的油气资源,同时位于华南块体与南海块体的洋陆转换带上,因此研究珠江口盆地的裂陷演化过程对探讨南海的成因机制有重要的意义。前人研究成果表明,珠江口盆地新生代的断裂以NE向和NW向为主,把珠江口盆地分隔成南北分带、东西分块的构造格局,本文通过地球物理资料解释发现其中NE向断裂呈明显的向海阶梯状排列的发育特征,控制着珠江口盆地从北向南的裂陷演化过程以及沉积构造迁移。结合区域构造演化背景分析,认为太平洋板块俯冲以及印度-欧亚板块碰撞引起的远程和深部效应是阶梯状断裂的主要动力学机制,南海北部岩浆活动、张裂作用以及南部洋盆的洋脊跃迁等构造事件在时空上为连续、有序的构造事件,与深部地幔物质一边上涌一边向南迁移有关。
Pearl River Mouth Basin is the rifting basin developed in Cenozoic in the northern continental margin of South China Sea, where is rich in oil and gas resources and is located in the oceawcontinent transition zone between South China block and South China Sea block. Therefore, it is of great significance to investigate its rift evolution process as well as formation mechanism of South China Sea. Previous studies show that the Cenozoic of Pearl River Mouth Basin mainly includes NE and NW tren ding faults, which divide the basin into belts in the NS direction and blocks in the EW direction. The NE-trending faults show ob vious development characteristics of the ladder-like arrangement, which control the evolution process and sedimentary-structural migration of Pearl River Mouth Basin from north to south. Combined with the regional tectonic evolution background, the longrange and deep effects caused by the subduction of Pacific plate and the collision of Indian Eurasian plate are the main dynamic mechanism of the ladder-like faults in the northern South China Sea. The events of magma activity, rifting, and the ocean ridge transition are the continuous and ordered tectonic events in time and space, which relate to the upwelling and southward migration of deep mantle material.
出处
《中国科技论文》
CAS
北大核心
2015年第3期322-326,330,共6页
China Sciencepaper
基金
高等学校博士学科点专项科研基金资助项目(20120171120029)
中国海及邻域地质地球物理系列图资助项目(GZH200900504)
国家自然科学基金资助项目(41206035)
关键词
珠江口盆地
南海
阶梯状断裂
Pearl River Mouth Basin
South China Sea
ladder-like fault
