| 关于南海北部特提斯的讨论 |
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| 引用本文： | 栾锡武,王嘉,刘鸿,张亮,鲁银涛.关于南海北部特提斯的讨论[J].地球科学,2021,46(3):866-884. |
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| 作者姓名： | 栾锡武 王嘉 刘鸿 张亮 鲁银涛 |
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| 作者单位： | 1.中国地质调查局青岛海洋地质研究所, 山东青岛 266071 |
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| 基金项目： | 国家基金重大研究计划项目;中国-东盟海上合作基金项目 |
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| 摘 要： | 南海及邻区处于欧亚大陆与冈瓦纳古陆拼合带的东南端，是特提斯构造域和濒太平洋构造域交汇的重要地区.特提斯缝合带沿金沙江-哀牢山构造带进入南海，人们从而认为南海可能存在特提斯洋遗迹，并认为缝合带存在于磁静区中.本文通过对南海北部陆坡地球物理资料的解释结果，包括重力、磁力、海底地震和深反射地震数据，以及区域地质特征分析，研究了南海北部陆缘高磁异常带和磁静区的成因.结果表明高磁异常带是中白垩世时期古太平洋板块转向俯冲形成的陆缘火山弧，当时存在古俯冲带.磁静区经历了后期大陆边缘张裂和古南海和南海的打开，并经历了高温热物质的底辟作用，使得地壳拉张减薄，居里面抬升形成磁静区.经历了南海的扩张后，原始的俯冲带可能已经向南迁移到南海南部或者已经俯冲消失，其中也不存在缝合带.
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| 关 键 词： | 南海北部 特提斯缝合带 高磁异常带 磁静区 海洋地质 |
| 收稿时间： | 2020-10-15 |
A Discussion on Tethys in Northern Margin of South China Sea |
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| Luan Xiwu,Wang Jia,Liu Hong,Zhang Liang,Lu Yintao.A Discussion on Tethys in Northern Margin of South China Sea[J].Earth Science-Journal of China University of Geosciences,2021,46(3):866-884. |
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| Authors: | Luan Xiwu Wang Jia Liu Hong Zhang Liang Lu Yintao |
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| Abstract: | The South China Sea and its adjacent areas are located at the southeast end of the convergence zone of Eurasia and Gondwana, which is an important area where the Tethys tectonic domain meets the Pacific tectonic domain. The Tethys suture zone enters the South China Sea along the Jinshajiang-Ailaoshan structural belt, which suggests that there may be Tethys ocean traces in the South China Sea and that the suture zone exists in the magnetostatic area. Based on the interpretation results of geophysical data on the northern continental slope of the South China Sea, including gravity, magnetic, submarine seismic and deep reflection seismic data, as well as the analyses of regional geological characteristics, this paper studies the genesis of the high magnetic anomaly zone and magnetostatic area in the northern continental margin of the South China Sea. It is considered that the high magnetic anomaly zone is a continental margin volcanic arc formed by the turning and subduction of the Paleo Pacific Plate in the Middle Cretaceous. The magnetostatic area experienced the late continental margin rifting and the opening of the Paleo-South China Sea and South China Sea, and experienced the bottom splitting of high-temperature thermal materials, which caused the crustal tension and thinning, and the Curie uplift to form the magnetostatic area. After the expansion of the South China Sea, the original subduction zone may have migrated to the south of the South China Sea or subducted and disappeared, and there is no suture zone. |
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