DOI: 10.1016/j.tecto.2021.228793
论文题名: Late Triassic contractional tectonics in the overriding plate of the Sulu orogenic belt, Eastern China
作者: Meng L. ; Lin W.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2021
卷: 806 语种: 英语
中文关键词: 40Ar/39Ar geochronology
; Anisotropy of magnetic susceptibility
; Overriding plate
; Structural analysis
; Sulu orogenic belt
英文关键词: Deformation
; Geochronology
; Magnetic anisotropy
; Magnetic susceptibility
; Tectonics
; Anisotropy of magnetic susceptibility
; Continental subductions
; Deformation temperatures
; Ductile deformations
; Monoclinal structures
; North China blocks
; Tectonic evolution
; Ultra high pressure (UHP)
; Plates (structural components)
; argon-argon dating
; continental margin
; deformation
; magnetic anisotropy
; orogenic belt
; plate motion
; plate tectonics
; subduction
; tectonic evolution
; tectonic setting
; Triassic
; China
; Sulu Belt
英文摘要: It is well known that the Dabie-Sulu orogenic belt resulted from the northward continental subduction of the South China Block (SCB) beneath the North China Block (NCB) during the Triassic. Correlating the deformation events recorded in the subducted and overriding plates is essential to understand its tectonic evolution, but related deformation is poorly documented in the overriding plate. In this contribution, we present detailed structural analysis, anisotropy of magnetic susceptibility (AMS), and geochronological data in the Linsishan unit of the Jiaobei massif, the overriding plate of the Sulu orogenic belt. The Linsishan unit preserves a significant ductile deformation characterized by NNW-, NE-, or SE-dipping foliations with NE–SW trending mineral lineations. Coupling mesoscopic and magnetic fabrics augment the NE–SW linear structures. The NE-dipping monoclinal structures with top-to-SW kinematics could be interpreted as a SW-directed thrusting, the deformation temperature of which is 350–450 °C according to the quartz c-axis fabrics. The timing of deformation is constrained to be 223–221 Ma based on 40Ar/39Ar dating of the deformed rocks and linked with a syn-collisional stage in the Sulu orogenic belt. Combining these new results with previous works, we propose a three-stage evolution model for the Sulu orogenic belt, namely (1) subducted SCB experienced ultra-high pressure (UHP) metamorphism before 230 Ma; (2) SW-directed thrusting was developed in the overriding plate, coeval with the syn-collisional exhumation of UHP rocks during 230–220 Ma; (3) post-collisional migmatization, magmatism, extension, and UHP rocks exhumation took place at 220–205 Ma. © 2021 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170860
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Innovation Academy for Earth Science, Chinese Academy of Sciences, Beijing, 100029, China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
Recommended Citation:
Meng L.,Lin W.. Late Triassic contractional tectonics in the overriding plate of the Sulu orogenic belt, Eastern China[J]. Tectonophysics,2021-01-01,806