| Crustal structure of the northwestern sub-basin, South China Sea: Results from a wide-angle seismic experiment | |
| Wu ZhenLi1,2,3,4; Li JiaBiao1,4; Ruan AiGuo1,4; Lou Hai5; Ding WeiWei1,4; Niu XiongWei1,4; Li XiBing1,4; Li, JB (reprint author), State Ocean Adm, Inst Oceanog 2, Hangzhou 310012, Zhejiang, Peoples R China. | |
| 2012 | |
| 发表期刊 | SCIENCE CHINA-EARTH SCIENCES
 |
| ISSN | 1674-7313 |
| 卷号 | 55期号:1页码:159-172 |
| 文章类型 | Article |
| 摘要 | The crustal structure of the northwestern sub-basin area of the South China Sea was modeled by inverting a wide-angle seismic survey line across the entire region and on both sides of its bounding continental margins. The survey line extended over 484 km. A total of 14 Ocean Bottom Seismometers (OBS) were deployed at intervals of 30 km to record air-gun array sources with a combined volume of 5160 in(3). The crustal velocity structure of the northwestern sub-basin area was acquired through the integration of multi-channel seismic data. OBS data were processed and modeled initially using ray tracing inversion techniques. Results indicate that crustal thickness under the continental slope decreases from 21 to 11 km, crustal thickness of the northwestern sub-basin is 7.7 km, and the depth to the Moho ascends from 21 km under the upper continental slope to 11 km under the middle basin. The crust of the northwestern sub-basin is similar to that of the eastern sub-basin in its oceanic crustal structure. This structure has a thicker layer 1 (sedimentary layer) and a thinner layer 2. These characteristics are especially clear in the eastern sub-basin, which differs somewhat from typical oceanic crust. The tectonic geometry and velocity structure of the northwestern sub-basin and its margins comprise a symmetrical conjugate and indicate a pure shear mode with regard to the continental margin rifting mechanism. We did not find clear seismic signals from high velocity layers under the lower crust of the continental margin in the northern part of the northwestern sub-basin, which provides new evidence for the idea that the western part of the northern continental margin of the South China Sea constitutes non-volcanic crust. Because the seafloor spreading period of the northwestern sub-basin was short, layer 2 might have experienced asymmetrical basalt magma flows, which may have blurred the magnetic anomaly lineations of the northwestern sub-basin. |
| 关键词 | Wide-angle Seismic Crustal Structure South China Sea Tectonic Evolution |
| 学科领域 | Geosciences, Multidisciplinary |
| DOI | 10.1007/s11430-011-4324-9 |
| URL | 查看原文 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000298967300016 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/12495 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Li, JB (reprint author), State Ocean Adm, Inst Oceanog 2, Hangzhou 310012, Zhejiang, Peoples R China. |
| 作者单位 | 1.State Ocean Adm, Inst Oceanog 2, Hangzhou 310012, Zhejiang, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 3.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China 4.State Ocean Adm, Lab Submarine Geosci, Hangzhou 310012, Zhejiang, Peoples R China 5.China Earthquake Adm, Inst Geophys, Beijing 100081, Peoples R China |
| 第一作者单位 | 中国科学院海洋研究所 |
| 推荐引用方式 GB/T 7714 | Wu ZhenLi,Li JiaBiao,Ruan AiGuo,et al. Crustal structure of the northwestern sub-basin, South China Sea: Results from a wide-angle seismic experiment[J]. SCIENCE CHINA-EARTH SCIENCES,2012,55(1):159-172. |
| APA | Wu ZhenLi.,Li JiaBiao.,Ruan AiGuo.,Lou Hai.,Ding WeiWei.,...&Li, JB .(2012).Crustal structure of the northwestern sub-basin, South China Sea: Results from a wide-angle seismic experiment.SCIENCE CHINA-EARTH SCIENCES,55(1),159-172. |
| MLA | Wu ZhenLi,et al."Crustal structure of the northwestern sub-basin, South China Sea: Results from a wide-angle seismic experiment".SCIENCE CHINA-EARTH SCIENCES 55.1(2012):159-172. |
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