| 南海南北共轭边缘伸展模型探讨 |
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| 引用本文： | 吴世敏,杨恬,周蒂,丘学林,夏斌.南海南北共轭边缘伸展模型探讨[J].高校地质学报,2005,11(1):105-110. |
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| 作者姓名： | 吴世敏 杨恬 周蒂 丘学林 夏斌 |
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| 作者单位： | 中国科学院,边缘海重点实验室,广州, 510301 |
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| 基金项目： | 中国科学院创新项目 (KZCX2 -SW -117-0 1)，(KZCX2 -2 0 9-0 5 )，“十五”科研院所社会公益研究专项项目 (2 0 0 1DIA5 0 0 41)，国家重点基础发展规划课题 (G2 0 0 0 0 4670 2 )赞助 |
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| 摘 要： | 通过对南海南北边缘地震剖面的对比,结合周边构造分析,提出南海大陆边缘的裂离经历了两期伸展作用,即早期的简单剪切和晚期的纯剪切伸展作用。简单剪切发生在晚白垩世-早始新世,其动力与太平洋板块俯冲带的后撤、太平洋板块与欧亚板块之间汇聚速率的降低、以及先存北倾缝合带等密切相关。纯剪切发生在中始新世－渐新世－早中新世,剪切作用的转变与古南海的南向俯冲板块拖曳有关。
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| 关 键 词： | 南海 北部陆缘 伸展模型 |
| 文章编号： | 1006-7493(2005)01-0105-06 |
| 收稿时间： | 2005-03-20 |
| 修稿时间： | 2004年1月2日 |
Discussion on the Extension Model for the Conjugate Continental Margin of South China Sea |
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| WU Shi-min,YANG Tian,ZHOU Di,QIU Xue-lin,XIA Bin.Discussion on the Extension Model for the Conjugate Continental Margin of South China Sea[J].Geological Journal of China Universities,2005,11(1):105-110. |
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| Authors: | WU Shi-min YANG Tian ZHOU Di QIU Xue-lin XIA Bin |
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| Institution: | Key lab of Marginal Sea Geology, Chinese Academy of Sciences, Guangzhou 510301, China |
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| Abstract: | Based on examining the seismic profiles distributed at the north and south margins of South China Sea, combined with the tectonic analysis of its adjacent area, the authors pointed out that this region experienced two periods' extensions, i.e. the earlier simple shear and the later pure shear. The simple shear extension mainly occurred in Late Cretaceous-Early Paleogene, related to slab roll back of Pacific plate, decreasing Paleogene Pacific-Eurasia convergence rate and possible preexisting suture zone. Pure shear happened in response to the extensional slab pull forces from southward subduction of the Paleo-South China Sea beneath Borneo during the Oligocene and Miocene. |
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| Keywords: | South China Sea conjugate continental margin extension model |
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