Intrusion and its implication for subsidence: A case from the Baiyun Sag, on the northern margin of the South China Sea
文献类型：期刊论文
| 作者 | Shi, XB ; Burov, E ; Leroy, S ; Qiu, XL ; Xia, B |
| 刊名 | TECTONOPHYSICS
 |
| 出版日期 | 2005 |
| 卷号 | 407期号:40545页码:117-134 |
| 关键词 | intrusion subsidence high velocity layer South China Sea |
| ISSN号 | 0040-1951 |
| 通讯作者 | xbshi@scsio.ac.cn |
| 中文摘要 | We develop a series of simple numerical models to explain the anomalous subsidence and deposition phenomena on the northern continental margin of the South China Sea, in particular in the Baiyun Sag. The results suggest that a short-period high rate deposition of around 17 Ma is related to a rapid subsidence event, which may be due to episodic emplacement of a dense intrusion. Necking and gravity models indicate that in the basement of the Baiyun Sag, there is a dense zone that is 100-200 kg/m(3) more dense than the surrounding country rock. Considering its high magnetic intensity and regional igneous activity, the dense zone is thought to be related to a phase of basalt intrusion that may have taken place around 17 Ma. Thermal and subsidence models indicate that a hot denser intrusion can cause significant subsidence immediately after the intrusion. The subsidence rate then slows down with cooling, thus becoming consistent with the observed subsidence curves at around 17 Ma. The results also indicate that the lithospheric strength under the Baiyun Sag is negligible, and that the high-velocity layer in the lowermost crust may be not an original part of the pre-rift crust. Instead, it is thought to be underplated intrusion emplaced at around 30 Ma when the continental margin broke up. (c) 2005 Elsevier B.V. All rights reserved. |
| 学科主题 | Geochemistry & Geophysics |
| 收录类别 | SCI |
| WOS记录号 | WOS:000232815100007 |
| 公开日期 | 2011-07-03 |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/4842]  |
| 专题 | 南海海洋研究所_中科院边缘海地质重点实验室 |
| 推荐引用方式 GB/T 7714 | Shi, XB,Burov, E,Leroy, S,et al. Intrusion and its implication for subsidence: A case from the Baiyun Sag, on the northern margin of the South China Sea[J]. TECTONOPHYSICS,2005,407(40545):117-134. |
| APA | Shi, XB,Burov, E,Leroy, S,Qiu, XL,&Xia, B.(2005).Intrusion and its implication for subsidence: A case from the Baiyun Sag, on the northern margin of the South China Sea.TECTONOPHYSICS,407(40545),117-134. |
| MLA | Shi, XB,et al."Intrusion and its implication for subsidence: A case from the Baiyun Sag, on the northern margin of the South China Sea".TECTONOPHYSICS 407.40545(2005):117-134. |
入库方式： OAI收割
来源：南海海洋研究所
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