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南海东北部磁静区的地壳结构与构造特征; Crustal structure of the Magnetic Quiet Zone in the northeastern South China Sea
Thesis Advisor丘学林,夏少红
Degree Discipline海洋地质
Keyword南海东北部 磁静区 高速层 地壳结构
Abstract南海北部陆缘受后期构造运动的改造较少,属于典型的张裂型大陆边缘,保存了南海张裂演化方面的重要信息,是晚中生代俯冲作用过渡到新生代南海海盆破裂和扩张的衔接点。南海北部分布着多个近NE向的构造带,地磁场具有明显的分带性,由北向南可以划分为北部复杂异常区、高磁异常带、陆坡磁异常平静区和海盆磁条带区。国内外学者目前对陆坡磁静区提出了很多成因模式(Taylor B et al.,1980;Zhang et al., 2002;夏戡原等,2004;赵俊峰等,2008;Wang et al., 2006;吴招才等,2010;李春峰等,2012;高金耀等,2009;刘鸿等,2014),这些模式提高了我们对于磁静区演化机制的理解,也认识到南海东北部磁静区在南海构造演化中的重要性。但对于磁静区的内部结构、是否存在构造异常体、磁静区与南海东北部下地壳高速体是否存在内在关系等方面的研究还较为欠缺,而这些科学问题的解决对于我们进一步深入理解南海扩张演化过程具有重要意义。
Other AbstractMargin of northern South China Sea transformed less by later tectonic movement, belong to the typical passive continental margin with the tensile fracture evolution and tectonic characteristics of the South China Sea, it is the joint from late Mesozoic subduction to the Cenozoic rifting and expansion of South China Sea basin. In addition, there are some tectonic belts nearly NE at the north and the magnetic anomaly can be divided into complex magnetic anomaly area, high magnetic anomaly area, slope magnetic quiet zone and basin magnetic belt from north to south. At present, the domestic and foreign scholars put forward many genetic models on the magnetic quiet zone (Tayloret al.,1980; Zhang et al., 2002; Xia et al.,2004; Zhao et al.,2008; Wang et al,2006; Wu et al.,2010; Li et al.,2012; Gao et al,2009; Liu et al.,2014), but many of them are based on speculation. For the magnetic quiet zone, there are a lot of problems to be solved such as the internal structure, and the relation with other tectonic bodies, to study it can help us learn more about the Cenozoic seafloor spreading evolution process.
Document Type学位论文
Recommended Citation
GB/T 7714
陈金虎. 南海东北部磁静区的地壳结构与构造特征, Crustal structure of the Magnetic Quiet Zone in the northeastern South China Sea[D],2016.
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