气候变化领域集成服务门户(CCPortal): Interactions between thin- and thick-skinned tectonics at the western Sichuan Basin, China

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DOI	10.1016/j.tecto.2020.228628
	Interactions between thin- and thick-skinned tectonics at the western Sichuan Basin, China
	Wang M.; Feng W.; Jiang D.; Yan B.; Chen Z.; Song G.
发表日期	2020
ISSN	00401951
卷号	796
英文摘要	This study investigates the geometry, kinematics, and interaction of thin- and thick-skinned tectonics at the western Sichuan Basin adjacent to the eastern margin of the Tibetan Plateau. A two-level detachment system, comprising a shallow Triassic and basal Precambrian detachment, was identified. Three-dimensional (3-D) structural modeling was applied to demonstrate the geometry of the shallow detachment that developed in the Sichuan foreland basin. The shallow detachment forming material is an evaporite sequence deposited in the Middle Triassic, which was subsequently buried beneath the foreland basin and later subsided rapidly during the flexural loading process during the Late Triassic. In the Cenozoic, this set of evaporite rocks developed into an effective shallow detachment, transferring geologic slip from the Longmen Shan range front to the Sichuan Basin. The structure of this shallow detachment exhibits an asymmetrical characteristic, with its deepest location consistent with the Mesozoic foreland depression. This relationship indicates that foreland subsidence in the Late Mesozoic is the main factor controlling the geometry of the detachment. In the southern Cenozoic foreland basin, the development of thrust faults above the Precambrian basal detachment resulted in a local deformation and uplift of the shallow detachment, resulting in a lower basal slope (0.5°–1°) of the sedimentary basin taper and a high internal distribution. In contrast, the sedimentary basin taper in the north has a high basal slope that mainly translates along the shallow detachment, lacking thrusting-related structures. This study reveals that the pre-existing stratigraphic architecture of the sedimentary basin can influence the subsequent structural deformation of the foreland basin. This has important implications for other foreland basins with multistage crustal shortening processes. © 2020 Elsevier B.V.
关键词	Basal detachment Shallow detachment Sichuan Basin Stratigraphic architecture Tectonic geomorphology Thin- and thick-skinned tectonics
英文关键词	Deformation; Geometry; Sedimentology; Settling tanks; Stratigraphy; Crustal shortening; Local deformations; Stratigraphic architecture; Structural deformation; Structural modeling; Thick-skinned tectonics; Threedimensional (3-d); Western Sichuan basin; Faulting; basal area; crustal shortening; detachment fault; evaporite; flexure; foreland basin; geometry; geomorphology; stratigraphy; tectonic setting; Triassic; China; Sichuan Basin
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207894
作者单位	College of Oceanography, Hohai University, Nanjing, Jiangsu 210098, China; Key Laboratory of Basin Structure and Petroleum Accumulation, Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, China
推荐引用方式 GB/T 7714	Wang M.,Feng W.,Jiang D.,et al. Interactions between thin- and thick-skinned tectonics at the western Sichuan Basin, China[J],2020,796.
APA	Wang M.,Feng W.,Jiang D.,Yan B.,Chen Z.,&Song G..(2020).Interactions between thin- and thick-skinned tectonics at the western Sichuan Basin, China.Tectonophysics,796.
MLA	Wang M.,et al."Interactions between thin- and thick-skinned tectonics at the western Sichuan Basin, China".Tectonophysics 796(2020).