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南海位于欧亚板块、太平洋板块和印澳板块的交汇处,由于其特殊的构造位置受到了国内外地质地球物理学者的关注.中生代以来南海经历了复杂的地质作用,南海北部陆缘断裂极为发育,本文通过断裂带的展布与组合关系进一步研究南海北部陆缘的区域构造特征.根据南海北部陆缘的卫星测高重力异常,通过位场分离、垂向一阶导数计算以及归一化总水平导数垂向导数技术识别出断裂信息.结合地质地球物理资料,分析主要断裂的地质地球物理特征,给出了研究区内的断裂分布图,重点对红河断裂、滨海断裂带及南海北部中生代俯冲增生带进行了讨论.文章对3条重要断裂带在海区的延伸提出了相应的重力依据及认识,认为红河断裂在海区经莺歌海1号断裂与“中建凸起”两侧断裂相连,是印支块体与南海块体的分界线;滨海断裂带为华南块体与南海块体的缝合线,中生代俯冲增生带向东北延伸与浙闽火成岩带相连.
The South China Sea is located at the confluence of the Eurasian Plate, the Pacific Plate and the Indo-Australian Plate because of its special structure and geophysicalians’ attention at home and abroad. Since the Mesozoic, the South China Sea experienced complex geological processes and the continental margin faults in the northern South China Sea developed extremely , The tectonic features of the northern continental margin of the South China Sea are further studied through the distribution and combination of fault zones.Based on the satellite altimetry gravity anomaly in the northern continental margin of the South China Sea, through the field-field separation, the first-order derivative calculation and the normalized total Based on the geophysical and geophysical data, the geological and geophysical characteristics of the main faults are analyzed, and the distribution of the fractures in the study area is given. The emphasis is put on the red-river fault, the coastal fault zone and the Mesozoic subduction in the northern South China Sea The article discussed the gravity basis and understanding of the extension of three important fault zones in the sea area, and concluded that the Honghe fault ruptured in the sea area along Yinggehai 1 and the “Zhongbu raised” Is the dividing line between the Indo-China block and the South China Sea block; the Binhai fault zone is the suture of the South China block and the South China Sea block, Subduction accretion zone extending to the northeast connected with igneous Zhejiang Fujian.