| YANG Fengli,ZHOU Zuyi,ZHANG Na,LIU Ning,NI Bin.Stress field modeling of northwestern South China Sea since 5.3 Ma and its tectonic significance[J].Acta Oceanologica Sinica,2013,32(12):31-39 |
| Stress field modeling of northwestern South China Sea since 5.3 Ma and its tectonic significance |
| Stress field modeling of northwestern South China Sea since 5.3 Ma and its tectonic significance |
| 投稿时间：2013-05-18 修订日期：2013-08-04 |
| DOI：10.1007/s13131-013-0385-2 |
| 中文关键词: northwestern South China Sea Pliocene stress field modeling rift system |
| 英文关键词:northwestern South China Sea Pliocene stress field modeling rift system |
| 基金项目:The National Natural Science Foundation of China under contract Nos 41322036, 41230960, 40906034 and 41276003; China Ocean Mineral Resources R&D Association (COMRA) under contract No. DY125-12-R-05; China Postdoctoral Science Foundation under contract No. 201104616; the Taishan Scholar Program of Shandong Province. |
| 作者 | 单位 | E-mail | | YANG Fengli | School of Ocean and Earth Science, Tongji University, Shanghai 200092, China | yangfl@tongji.edu.cn | | ZHOU Zuyi | School of Ocean and Earth Science, Tongji University, Shanghai 200092, China | | | ZHANG Na | School of Ocean and Earth Science, Tongji University, Shanghai 200092, China | | | LIU Ning | School of Ocean and Earth Science, Tongji University, Shanghai 200092, China | | | NI Bin | School of Ocean and Earth Science, Tongji University, Shanghai 200092, China | |
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| 摘要点击次数: 1771 |
| 全文下载次数: 1908 |
| 中文摘要: |
| Tectonically, the northwestern South China Sea (SCS) is located at the junction between three micro-plates, i.e., the Indochina, South China and Zhongsha-Xisha micro-plates, and involves three basins, i.e., the Yinggehai Basin, the Qiongdongnan Basin and Xisha Trough in the east, and the Zhongjiannan Basin in the south. Since the Pliocene (5.3 Ma), the Yinggehai Basin has experienced repeated accelerating subsidence, high thermal fluid, and widely developing mud-rich overpressure chambers, abundant mud diapers and crust-mantle mixed CO2. While a large central canyon was developed in the Qiongdongnan Basin, new rift occurred in the Xisha Trough. These characteristics demonstrate a single tectonic unit for the northwestern SCS, for which we have undertaken stress field modeling to understand its plate deformations and sedimentary responses. Our results demonstrate that an extension tectonic event occurred after 5.3 Ma in the Yinggehai-Qiongdongnan-Xisha trough area, which is characterized by thinner crust (<16 000 m), half-graben or graben structural style and thicker sedimentary sequences (>3 500 m). A new rift system subsequently was developed in this area; this event was mainly driven by the combined effects of different movement velocity and direction of the three micro-plates, and the far-field effect of the continental collision between the Indian Plate and the Tibetan Plateau, and subduction of the Pacific Plate underneath the Eurasian Plate. |
| 英文摘要: |
| Tectonically, the northwestern South China Sea (SCS) is located at the junction between three micro-plates, i.e., the Indochina, South China and Zhongsha-Xisha micro-plates, and involves three basins, i.e., the Yinggehai Basin, the Qiongdongnan Basin and Xisha Trough in the east, and the Zhongjiannan Basin in the south. Since the Pliocene (5.3 Ma), the Yinggehai Basin has experienced repeated accelerating subsidence, high thermal fluid, and widely developing mud-rich overpressure chambers, abundant mud diapers and crust-mantle mixed CO2. While a large central canyon was developed in the Qiongdongnan Basin, new rift occurred in the Xisha Trough. These characteristics demonstrate a single tectonic unit for the northwestern SCS, for which we have undertaken stress field modeling to understand its plate deformations and sedimentary responses. Our results demonstrate that an extension tectonic event occurred after 5.3 Ma in the Yinggehai-Qiongdongnan-Xisha trough area, which is characterized by thinner crust (<16 000 m), half-graben or graben structural style and thicker sedimentary sequences (>3 500 m). A new rift system subsequently was developed in this area; this event was mainly driven by the combined effects of different movement velocity and direction of the three micro-plates, and the far-field effect of the continental collision between the Indian Plate and the Tibetan Plateau, and subduction of the Pacific Plate underneath the Eurasian Plate. |
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