| 南海地球物理场特征及基底断裂体系研究 |
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| 引用本文： | 宋海斌,丘学林,等.南海地球物理场特征及基底断裂体系研究[J].地球物理学进展,2002,17(1):24-34. |
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| 作者姓名： | 宋海斌 丘学林 |
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| 作者单位： | [1]中国科学院地质与地球物理研究所，北京100101 [2]中国科学院南海海洋研究所，广州510301 |
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| 基金项目： | 中国科学院知识创新工程项目 (KZCX2 2 0 9)，国家重点基础研究发展规划项目 (G2 0 0 0 0 46 7) |
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| 摘 要： | 南海海域主体可划分为南海北缘、中西沙、南沙南海海盆四块，各块具有明显不同的重磁场特征。反演得到的莫霍面总体趋势由陆向洋抬升，反映陆壳、拉伸陆壳、过渡壳、洋壳的分布。东沙高磁异常含一定的高频成份，与新生代玄武岩及中生代岩浆岩有关，而其低频成份可能反映了发育的下地壳高速层，南海海域断裂极为发育，可分为北东向断裂组、东西向断裂组、北西向断裂组和南北向断裂组，南海北缘、南缘均以北东向张性断裂与北西向张剪性、剪性断裂为主要格架，形成了、南北分带、东西分块”构造格局。
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| 关 键 词： | 南海 地球物理场 莫霍面 基底断裂 玄武岩 岩浆岩 |
| 文章编号： | 1004-2903(2002)01-0024-11 |
| 修稿时间： | 2001年11月15 |
Researches on Geophysical Field Characteristics and Basement Fault System of South China Sea |
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| SONG Hai-bin,HAO Tian-yao,JIANG Wei-wei,QIU Xue-lin,XU Yi,LIU Jian-hua.Researches on Geophysical Field Characteristics and Basement Fault System of South China Sea[J].Progress in Geophysics,2002,17(1):24-34. |
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| Authors: | SONG Hai-bin HAO Tian-yao JIANG Wei-wei QIU Xue-lin XU Yi LIU Jian-hua |
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| Institution: | SONG Hai-bin 1 HAO Tian-yao 1 JIANG Wei-wei 1 QIU Xue-lin 2 XU Yi 1 LIU Jian-hua 1 |
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| Abstract: | Geophysical features and basement faults system of South China Sea are studied. According to characteristics of geophysical fields, South China Sea can be divided to four blocks, which are north margin block, Zhongsha-Xisha block, Nansha block and central basin block with different features. Inversion shows Moho discontinuity depth increase from land to sea and the distribution of continental crust, extensional crust, transitional crust and oceanic crust. The high frequency part of Dongsha high-value magnetic anomaly may be related with Cenozoic basalt and Mesozoic magmatic rocks, and the low frequency part developing high-velocity lower crust. Fault systems develop well in South China Sea and can be divided to four groups, which are northeast-direction fault group, eastwest-direction fault group, northwest-direction fault group and northsouth-direction fault group. On north margin and south margin of South China Sea, northeast-direction extension faults and northwest extension/extension-shear faults characterize the main tectonic framework of separated stripes in north-west direction and blocks in west-east direction. |
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| Keywords: | South China Sea Geophysical fields Moho discontinuity Basement faults |
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