气候变化领域集成服务门户(CCPortal): Subduction of the Sumdo Paleo-Tethys Oceanic Lithosphere and evolution of the Lhasa Terrane: Inspiration from Middle Triassic Magmatism in Sumdo, Tibet

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DOI	10.1016/j.lithos.2024.107554
	Subduction of the Sumdo Paleo-Tethys Oceanic Lithosphere and evolution of the Lhasa Terrane: Inspiration from Middle Triassic Magmatism in Sumdo, Tibet
	Duan, Meng -Long; Xie, Chao -Ming; Song, Yu -Hang; Wang, Bin; Hao, Yu-Jie; Zhang, Jia-Jun
发表日期	2024
ISSN	0024-4937
EISSN	1872-6143
起始页码	472
卷号	472
英文摘要	Owing to the impact of the Paleo-, Meso-, and Neo-Tethys Oceans, the Triassic evolution of the Lhasa Terrane is complex and remains debated. The little-known subduction of the oceanic lithosphere of the Sumdo Paleo-Tethys Ocean (SPTO) in the Triassic has especially constrained our understanding of the evolution of the Lhasa Terrane. We investigated the newly identified Triassic granite and metabasalt in the Sumdo area to detail new constraints regarding the Triassic subduction of the SPTO oceanic lithosphere and evolution of the Lhasa Terrane. Zircon LAICP-MS U-Pb dating for granite and metabasalt yielded crystallization ages of 238.4-236.1 Ma. The granites were strongly peraluminous I -type granites with weakly fractional crystallization. High Nb contents (on average 51.91 ppm), low epsilon Hf(t) values (-19.7 to +2.8), and epsilon Nd(t) values (-2.86 to -2.2) suggest that the granites were likely generated by mixing of mantle melts and their induced melts of ancient crustal materials. Metabasalts were analogous to island arc tholeiite with negative Th, Nb, Ti, Zr, and Hf anomalies and positive epsilon Nd(t) values (+6.1 to +7.1), demonstrating that the magma was likely derived from the partial melting of the depleted mantle metasomatized by subduction fluids. Combined with Triassic magmatism in the Lhasa Terrane, we consider that a divergent double subduction of the SPTO oceanic lithosphere produced the Early Triassic to early Late Triassic magmatism (248-221 Ma) concentrating on both sides of the SPTO suture zone. The Middle Triassic granites and metabasalts in this study were formed in the continental and intra-oceanic arcs, respectively, of the SPTO. Subsequently, closure of the SPTO and collision between the central- and southern Lhasa Terrane might have triggered the subduction of the Indus-Yarlung Tsangbo oceanic lithosphere broadly generating the late Late Triassic magmatism (217-201 Ma) in the Lhasa Terrane.
英文关键词	Tibet; Lhasa Terrane; Sumdo Paleo-Tethys Ocean; Triassic; Subduction
语种	英语
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
WOS类目	Geochemistry & Geophysics ; Mineralogy
WOS记录号	WOS:001207535400001
来源期刊	LITHOS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/291066
作者单位	Jilin University; Ministry of Natural Resources of the People's Republic of China; Jilin University; Jilin University; Northwest University Xi'an
推荐引用方式 GB/T 7714	Duan, Meng -Long,Xie, Chao -Ming,Song, Yu -Hang,et al. Subduction of the Sumdo Paleo-Tethys Oceanic Lithosphere and evolution of the Lhasa Terrane: Inspiration from Middle Triassic Magmatism in Sumdo, Tibet[J],2024,472.
APA	Duan, Meng -Long,Xie, Chao -Ming,Song, Yu -Hang,Wang, Bin,Hao, Yu-Jie,&Zhang, Jia-Jun.(2024).Subduction of the Sumdo Paleo-Tethys Oceanic Lithosphere and evolution of the Lhasa Terrane: Inspiration from Middle Triassic Magmatism in Sumdo, Tibet.LITHOS,472.
MLA	Duan, Meng -Long,et al."Subduction of the Sumdo Paleo-Tethys Oceanic Lithosphere and evolution of the Lhasa Terrane: Inspiration from Middle Triassic Magmatism in Sumdo, Tibet".LITHOS 472(2024).