Seismic evidence for Mesozoic strata in the northern Nansha waters, South China Sea
文献类型：期刊论文
| 作者 | Wang, Yanlin; Qiu, Yan; Yan, Pin; Zheng, Hongbo; Liu, Hailing; Wang, Jun |
| 刊名 | TECTONOPHYSICS
 |
| 出版日期 | 2016 |
| 卷号 | 677页码:190-198 |
| 关键词 | Nansha waters Lower structural layer Angular unconformities Velocity leap Mesozoic Proto-South China Sea |
| 通讯作者 | Wang, YL (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, 164 West Xingang Rd, Guangzhou 510301, Guangdong, Peoples R China. |
| 中文摘要 | According to previous studies, Mesozoic deposits have been unequivocally identified in the northeastern Nansha waters (southern margin of the South China Sea, SCS). Thick lower structural layers in the north Nansha waters have not clearly been identified as either Mesozoic or Cenozoic strata. These strata are characterized by strong top erosion, tilted layer or folded anticlines. New long-offset multi-channel seismic data show refracted phases from the top of the lower structural layer in the northern Nansha waters. A major velocity leap (approximately from 1.6 km/s to 3.8 km/s or 2.9 km/s to 5.3 km/s), calculated from the refraction wave of seismic data, is found across a prominent angular unconformity, indicating a major sedimentary hiatus. According to the stratigraphic characteristics and velocity range of the lower structural layer, velocity leap at the top of lower structural layer and ubiquitous absence of upper Cretaceous strata in the Nansha waters, the lower structural layer of the northern Nansha waters are interpreted as Mesozoic. Based on the similarities in stratigraphic characteristics of the lower structural layers between the northern and central Nansha waters, previous studies from gravity data and multi-channel seismic data, we propose that lower structural layers over central Nansha waters may also Mesozoic. This further suggests that the intensity of upper crustal extension was moderate in Nansha waters during the Cenozoic, which related to a combination of the Cenozoic slab pull of the proto-SCS and lithosphere delamination over an ancient orogenic belt between the northern and southern continental margins of the SCS, which may weaken extension of upper crust over the Nansha waters. (C) 2016 Elsevier B.V. All rights reserved. |
| 学科主题 | Geochemistry & Geophysics |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/15433]  |
| 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 | Wang, Yanlin,Qiu, Yan,Yan, Pin,et al. Seismic evidence for Mesozoic strata in the northern Nansha waters, South China Sea[J]. TECTONOPHYSICS,2016,677:190-198. |
| APA | Wang, Yanlin,Qiu, Yan,Yan, Pin,Zheng, Hongbo,Liu, Hailing,&Wang, Jun.(2016).Seismic evidence for Mesozoic strata in the northern Nansha waters, South China Sea.TECTONOPHYSICS,677,190-198. |
| MLA | Wang, Yanlin,et al."Seismic evidence for Mesozoic strata in the northern Nansha waters, South China Sea".TECTONOPHYSICS 677(2016):190-198. |
入库方式： OAI收割
来源：南海海洋研究所
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