气候变化领域集成服务门户(CCPortal): Rift Structure and Sediment Infill of Hyperextended Continental Crust: Insights From 3D Seismic and Well Data (Xisha Trough, South China Sea)

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DOI	10.1029/2019JB018610
	Rift Structure and Sediment Infill of Hyperextended Continental Crust: Insights From 3D Seismic and Well Data (Xisha Trough, South China Sea)
	Lei C.; Alves T.M.; Ren J.; Tong C.
发表日期	2020
ISSN	21699313
卷号	125 期号:5
英文摘要	Three-dimensional seismic and well data from the deepwater Xisha Trough are used to investigate the rift structure and sediment infill of a region formed adjacently to the initial oceanic ridge of the South China Sea (SCS). The high-quality data permitted a detailed analysis of features such as (1) detachment faults soling out at the Moho, (2) rotated and thinned continental blocks covered by thick sediment, and (3) changes in the location of basin depocenters resulting from detachment faulting. During the continental rifting phase (Eocene to earliest Oligocene), faulting was broadly distributed in the Xisha Trough and resulted in the generation of isolated grabens/half grabens filled by proximal sediment sources. During continental breakup in the Northwest Ocean Sector of SCS (Oligocene), extension became restricted to a narrow region where highly tilted continental blocks and thin crust were formed. Sediment was, at that time, fed to distal depocenters, which are presently bounded by listric faults rooted in a basal detachment. Later in a second stage (early Miocene), synchronously with continental breakup in the Southwest Ocean Sector of the SCS, the study area was blanketed by thick sediment. During the two continental breakup events, the hyperextended Xisha Trough was affected by closely spaced, small-scale faults rather than large basement-related structures. Our study highlights the effect of continental breakup as a way to broaden sediment influx from multiple sources into deepwater basins. As a corollary, this work recognizes two distinct breakup sequences in the Xisha Trough and concludes on their geodynamic significance to the SCS. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Basin architecture; Detrital zircon U-Pb dating; Hyperextended continental crust; Rifted margin; Sediment sources
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187852
作者单位	Key laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan, China; College of Marine Science and Technology, China University of Geosciences, Wuhan, China; 3D Seismic Lab, School of Earth and Ocean Sciences, Cardiff University, Cardiff, United Kingdom; China National Offshore Oil Corporation Ltd., Zhanjiang, China
推荐引用方式 GB/T 7714	Lei C.,Alves T.M.,Ren J.,et al. Rift Structure and Sediment Infill of Hyperextended Continental Crust: Insights From 3D Seismic and Well Data (Xisha Trough, South China Sea)[J],2020,125(5).
APA	Lei C.,Alves T.M.,Ren J.,&Tong C..(2020).Rift Structure and Sediment Infill of Hyperextended Continental Crust: Insights From 3D Seismic and Well Data (Xisha Trough, South China Sea).Journal of Geophysical Research: Solid Earth,125(5).
MLA	Lei C.,et al."Rift Structure and Sediment Infill of Hyperextended Continental Crust: Insights From 3D Seismic and Well Data (Xisha Trough, South China Sea)".Journal of Geophysical Research: Solid Earth 125.5(2020).