| 南海大陆边缘动力学:科学实验与研究进展 |
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| 引用本文： | 李家彪.南海大陆边缘动力学:科学实验与研究进展[J].地球物理学报,2011,54(12):2993-3003. |
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| 作者姓名： | 李家彪 |
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| 作者单位： | 1. 国家海洋局海底科学重点实验室, 杭州 310012;
2. 国家海洋局第二海洋研究所,杭州 310012 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，国家自然科学基金 |
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| 摘 要： | 国家重点基础研究发展计划(973)项目(2007CB411700)首次在南海南部大陆边缘及西南次海盆开展长排列大震源多道地震、海底地震仪(OBS)折射/反射地震等的综合地球物理探测,结合地质构造、地球化学、动力模拟等的综合研究,形成如下重要认识:南海海盆新生代发生了早、晚两期海底扩张.早期扩张发生于33.5～25 Ma...
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| 关 键 词： | 综合地球物理探测 渐进式扩张 随深度变化拉张 非火山型陆缘 油气潜力 |
| 收稿时间： | 2011-10-10 |
Dynamics of the continental margins of South China Sea: scientific experiments and research progresses |
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| LI Jia-Biao.Dynamics of the continental margins of South China Sea: scientific experiments and research progresses[J].Chinese Journal of Geophysics,2011,54(12):2993-3003. |
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| Authors: | LI Jia-Biao |
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| Institution: | 1. Key Laboratory of the Sub-marine Geoscience, State Oceanic Administration, Hangzhou 310012, China;
2. The Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China |
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| Abstract: | Comprehensive geophysical survey, including the multi-channel seismic survey with long streamer and large air-gun source and the wide-angle refraction/reflection seismic survey of OBS, has been deployed in the southern margin and Southwest Sub-basin of the South China Sea for the first time. Based on the interpretation of these geophysical data, combined with studies on tectonic structure, geochemistry, and dynamic simulation, etc, our project worked out the dynamics of the continental margin in South China Sea. Major conclusions are as follows: Two sea-floor spreading events occurred in Cenozoic. The first episode happened between 33.5~25 Ma, and after a 1.5 Ma tectonic adjustment, started the second episode of sea-floor spreading between 23.5~15.5 Ma. In both episodes the South China Sea experienced propagation rifting and spreading from east to west, resulting in a structural framework featured with blocks in north-south direction and segments in east-west direction; Cenozoic marginal basins in the northern and southern continental margins show different rift-terminated time, which correspond with the two episodic sea-floor spreading respectively. The continental crust of the South China Sea might have experienced depth-dependent stretching. The lower crust and top of upper mantle have been magnetized and no obvious velocity anomalies of the mantle have been found in oceanic basin. South China Sea margins are a kind of magma-poor rifting, although lower crustal bodies of high-velocity occur in the east of the northern margin, but without SDR. The origin and evolution of sediment basins on northern and southern continental margins are very distinct, and the hydrocarbon accumulations are distributed in a cirque with oil outside and gas inside. We believe that the hydrocarbon-bearing perspectives in southern continental marginal basins are superior to these northern continental marginal basins. In Mesozoic the northern and southern margin of the South China Sea were parts of the South China Continental Block, which was controlled by the Tethays and Pacific tectonic domains. |
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| Keywords: | Comprehensive geophysical survey Spreading propagation Depth-dependent stretching Magma-poor rifting Hydrocarbon potential |
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