气候变化领域集成服务门户(CCPortal): Cambrian to Triassic geodynamic evolution of central Qiangtang, Tibet

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DOI	10.1016/j.earscirev.2020.103083
	Cambrian to Triassic geodynamic evolution of central Qiangtang, Tibet
	Xu W.; Liu F.; Dong Y.
发表日期	2020
ISSN	0012-8788
卷号	201
英文摘要	Central Qiangtang is a tectonic mélange between the northern Qiangtang terrane (NQT) and the southern Qiangtang terrane (SQT), and it preserves a complete Cambrian to Triassic geological record related to Tethyan evolution (e.g., high-pressure metamorphic rocks and ophiolites); thus, this region is the key to understanding the geodynamic processes that occurred during the dispersion of Gondwana and the accretion of Laurussia. Given previous studies on sedimentary, paleomagnetic and seismic records, this paper presents an integrated interpretation of ophiolites, magmatism, metamorphism and tectonism and reconstructs the Cambrian-Triassic tectonic evolution of central Qiangtang as described below. (1) Following the Neoproterozoic-early Cambrian Pan-African orogeny and associated postcollisional extension, the southward subduction of the Proto-Tethys oceanic plate produced Andean-type magmatism along the northern margin of Gondwana. A back-arc basin between the NQT and SQT further opened during the late Cambrian-early Ordovician, accompanying with trench retreat and overriding plate extension resulting from slab rollback. (2) With the middle Ordovician-late Silurian successive incorporation of micro-continental terranes (e.g., Qaidam-Kunlun and Tarim terranes) into the northern margin of Gondwana, the back-arc basin closed through subduction polarity reversal from southward to northward. (3) During the late Devonian-early Carboniferous, the southward subduction of an oceanic plate to the north of the NQT separated the NQT and SQT through back-arc extension. Consequently, the NQT drifted northward rapidly and the back-arc basin gradually evolved into a mature ocean basin (i.e., Longmu Co-Shuanghu Paleo-Tethys Ocean, LSPTO). (4) Subsequently, a late Carboniferous-early Permian continent-continent collision between the NQT and the South China Block (SCB) resulted in the northward subduction of the LSPTO, and the ongoing subduction probably induced the opening of a back-arc basin between the NQT and the SCB during the late Permian. (5) Finally, diachronous collision between the NQT and SQT closed the LSPTO during the early-middle Triassic, and the termination of the collisional orogenic event was evidenced by strong late Triassic magmatism related to postcollisional extension in the Qiangtang Block. In this paper, we propose that the opening and closure of back-arc basins controlled the Cambrian-Triassic tectonic evolution of central Qiangtang, which provides significant insights into the dispersion of Gondwana and the accretion of Laurussia. © 2020 Elsevier B.V.
英文关键词	Back-arc basin; Cambrian-Triassic; Qiangtang; Tectonic evolution; Tethys; Tibetan plateau
语种	英语
scopus关键词	backarc basin; basin evolution; Cambrian; extensional tectonics; geodynamics; Gondwana; magmatism; metamorphism; ophiolite; subduction; tectonic evolution; tectonic reconstruction; tectonic setting; Tethys; Triassic; China; Qinghai-Xizang Plateau
来源期刊	EARTH-SCIENCE REVIEWS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/209717
作者单位	Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China; Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China; College of Earth Science, Jilin University, Changchun, 130061, China
推荐引用方式 GB/T 7714	Xu W.,Liu F.,Dong Y.. Cambrian to Triassic geodynamic evolution of central Qiangtang, Tibet[J],2020,201.
APA	Xu W.,Liu F.,&Dong Y..(2020).Cambrian to Triassic geodynamic evolution of central Qiangtang, Tibet.EARTH-SCIENCE REVIEWS,201.
MLA	Xu W.,et al."Cambrian to Triassic geodynamic evolution of central Qiangtang, Tibet".EARTH-SCIENCE REVIEWS 201(2020).