DOI: 10.1016/j.tecto.2020.228628
论文题名: Interactions between thin- and thick-skinned tectonics at the western Sichuan Basin, China
作者: Wang M. ; Feng W. ; Jiang D. ; Yan B. ; Chen Z. ; Song G.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 796 语种: 英语
中文关键词: 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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170727
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Wang M.,Feng W.,Jiang D.,et al. Interactions between thin- and thick-skinned tectonics at the western Sichuan Basin, China[J]. Tectonophysics,2020-01-01,796