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DOI	10.1130/GES02602.1
	Late Cretaceous tectonothermal events of the Gangdese belt, southern Tibet
	Ma, Xuxuan; Xu, Zhiqin; Lusk, Alexander D.; Erdmann, Saskia; Chen, Xijie; Ma, Shiwei
发表日期	2023
ISSN	1553-040X
起始页码	933
结束页码	956
卷号	19 期号:3
英文摘要	The Gangdese belt of the southern Lhasa terrane (southern Tibet) records a Chilean-type accretionary orogeny driven by subduction of Neotethyan oceanic lithosphere, prior to Indo-Asian collision and formation of the Tibetan Plateau. We present detailed structural analysis of outcrops and a drill core in the Jiama copper ore district along with Ar-40-Ar-39 cooling ages from white mica, plagioclase, and potassium feldspar and zircon U-Pb geochronology of granitoids and sandstone. These data add new constraints to the formation of a major angular unconformity, deformation along and within the footwall of the Gangdese decollement, and the coupling between deformation and magmatism. Structural analysis indicates that top-to-the-south motion along the decollement produced south-vergent folding and thrusting of Upper Jurassic to Cretaceous strata in the Gangdese back-arc basin. A synthesis of new and compiled age data reveals that the decollement and associated south-vergent deformation occurred between ca. 90 and 65 Ma, contemporaneous with the formation of a major ca. 85-69 Ma angular unconformity between the overlying Paleocene-Eocene Linzizong Formation and the underlying Upper Cretaceous Shexing Formation. We posit that this deformation in the Gangdese belt resulted from flat-slab subduction of the Neotethyan oceanic slab beneath the southern margin of the Asian continent. A flat-slab subduction geometry is consistent with previously documented synchronous thrusting in the forearc and back-arc basins as well as the observed arc magmatic lull of the Gangdese belt between ca. 80 and 65 Ma.
英文关键词	XIGAZE FORE-ARC; LHASA TERRANE IMPLICATIONS; JURASSIC VOLCANIC-ROCKS; FLAT-SLAB SUBDUCTION; YARLUNG SUTURE ZONE; ZIRCON U-PB; TECTONIC EVOLUTION; CONTINENTAL-CRUST; YEBA FORMATION; NEO-TETHYS
WOS研究方向	Geosciences, Multidisciplinary
WOS记录号	WOS:000975341300001
来源期刊	GEOSPHERE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283041
作者单位	Ministry of Natural Resources of the People's Republic of China; China Geological Survey; Chinese Academy of Geological Sciences; Institute of Geology, Chinese Academy of Geological Sciences; Southern Marine Science & Engineering Guangdong Laboratory; Southern Marine Science & Engineering Guangdong Laboratory (Guangzhou); Nanjing University; University of Wisconsin System; University of Wisconsin Madison; Bureau de Recherches Geologiques et Minieres (BRGM); Centre National de la Recherche Scientifique (CNRS); Universite de Orleans; CNRS - National Institute for Earth Sciences & Astronomy (INSU); China Geological Survey
推荐引用方式 GB/T 7714	Ma, Xuxuan,Xu, Zhiqin,Lusk, Alexander D.,et al. Late Cretaceous tectonothermal events of the Gangdese belt, southern Tibet[J],2023,19(3).
APA	Ma, Xuxuan,Xu, Zhiqin,Lusk, Alexander D.,Erdmann, Saskia,Chen, Xijie,&Ma, Shiwei.(2023).Late Cretaceous tectonothermal events of the Gangdese belt, southern Tibet.GEOSPHERE,19(3).
MLA	Ma, Xuxuan,et al."Late Cretaceous tectonothermal events of the Gangdese belt, southern Tibet".GEOSPHERE 19.3(2023).