气候变化领域集成服务门户(CCPortal): Late Triassic contractional tectonics in the overriding plate of the Sulu orogenic belt, Eastern China

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DOI	10.1016/j.tecto.2021.228793
	Late Triassic contractional tectonics in the overriding plate of the Sulu orogenic belt, Eastern China
	Meng L.; Lin W.
发表日期	2021
ISSN	00401951
卷号	806
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.
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
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/208027
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
推荐引用方式 GB/T 7714	Meng L.,Lin W.. Late Triassic contractional tectonics in the overriding plate of the Sulu orogenic belt, Eastern China[J],2021,806.
APA	Meng L.,&Lin W..(2021).Late Triassic contractional tectonics in the overriding plate of the Sulu orogenic belt, Eastern China.Tectonophysics,806.
MLA	Meng L.,et al."Late Triassic contractional tectonics in the overriding plate of the Sulu orogenic belt, Eastern China".Tectonophysics 806(2021).