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学科主题: Geochemistry & Geophysics
题名: Cenozoic tectonic subsidence in deepwater sags in the Pearl River Mouth Basin, northern South China Sea
作者: Xie, H ; Zhou, D ; Li, YP ; Pang, X ; Li, PC ; Chen, GG ; Li, FC ; Cao, JH
关键词: Tectonic subsidence ; Backstripping ; Deepwater sags ; Pearl River Mouth Basin ; Baiyun Sag ; South China Sea
刊名: TECTONOPHYSICS
发表日期: 2014
卷: 615, 页:182-198
收录类别: sci
部门归属: [Xie Hui ; Zhou Di ; Li Pengchun ; Chen Guanghao ; Li Fucheng ; Cao Jinghe] Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China ; [Xie Hui ; Li Fucheng ; Cao Jinghe] Univ Chinese Acad Sci, Beijing 100049, Peoples R China ; [Li Yuanping ; Pang Xiong] China Natl Offshore Oil Corp, Inst Sci & Technol, Shenzhen Branch, Guangzhou 510420, Guangdong, Peoples R China
项目归属: 海洋地质
资助者: High-Tech R&D Program of China [2008AA093001]; National Science and Technology Key Project of the Ministry of Science and Technology of China [2011ZX05025-003-005]; Chinese National Science Foundation project [40976033]
摘要: The Cenozoic tectonic subsidence of the deepwater area in the Pearl River Mouth Basin, northern South China Sea is studied by subsidence analysis via backstripping calculations based on data of newly interpreted sequence boundaries. In the subsidence analysis local porosity-depth parameters were estimated based on well data, the paleo-water depth parameters and lithology were estimated for all grid nodes based on well data and sedimentary system maps, and ages of sequence boundaries were adjusted according to the International Chronostratigraphic Chart v2013/01. Sensitivity analysis shows that these are essential to ensure the quality of the subsidence analysis in the slope areas. Maps of tectonic subsidence rates of 18 Cenozoic sequences were constructed and spatial-temporal variations of the tectonic subsidence were discussed. The subsidence was restricted in the Baiyun and Liwan Sags before 30 Ma and extended to uplifts after 30 Ma. This indicates that the 30 Ma unconformity is the breakup unconformity that separated the syn-rift and post-rift sequences. Four substages of post-rift subsidence were identified by cyclic changes in the rate and pattern of tectonic subsidence at boundaries of 23.3 Ma, 17.2 Ma and 11.9 Ma, respectively. Anomalous post-rifting tectonic subsidence was significant and totaled to similar to 1200 m at the center of the Baiyun Sag, and punctuated by rapid subsidence and uplift events. The Baiyun Event was manifested in the study area by a short-lived uplift event in 23.9-23.3 Ma followed by a short-lived rapid subsidence in 23.3-19.8 Ma in the central study area. This localized rapid subsidence caused northward jump and anti-clockwise rotation of the shelf break. Two-order teeterboard (seesaw)-like subsidence was observed in the study area in the post-rifting stage, suggesting elastic deformations of the crust and lithosphere. (C) 2014 Elsevier B.V. All rights reserved.
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WOS记录号: WOS:000333003000013
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10636
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Xie, H; Zhou, D; Li, YP; Pang, X; Li, PC; Chen, GG; Li, FC; Cao, JH.Cenozoic tectonic subsidence in deepwater sags in the Pearl River Mouth Basin, northern South China Sea,TECTONOPHYSICS,2014,615():182-198
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