气候变化领域集成服务门户(CCPortal): Early Jurassic S-type granitoids in the Nyainqentanglha Range, South Tibet: A record of slab roll-back of subducted Neo-Tethyan Ocean

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DOI	10.1016/j.gr.2021.07.030
	Early Jurassic S-type granitoids in the Nyainqentanglha Range, South Tibet: A record of slab roll-back of subducted Neo-Tethyan Ocean
	Wang, Chao; Ding, Lin; Zhang, Li-Yun; Li, Jin-Xiang; Yue, Ya-Hui
通讯作者	Wang, C (通讯作者)
发表日期	2022
ISSN	1342-937X
EISSN	1878-0571
起始页码	175
结束页码	191
卷号	101
英文摘要	The Gangdese orogenic belt in southern Tibet records a succession of arc-trench-basin assemblages formed by the Neo-Tethyan subduction and the subsequent India-Asian collision. However, the geochronology and geodynamics of S-type granites in the northern part of the Gangdese belt are disputed. This paper describes similar to 190 Ma S-type granitoids outcropped in the Nyainqentanglha Range, South Tibet, focusing on their petrogenesis and their relationship with contemporaneous magmatism. There are three distinct groups of granitoids, based on field relationships, petrology, and geochemistry. The coarse-grained Group I and II granitoids are large, sheet-like bodies and exhibit high contents of incompatible elements and negative Eu anomalies. The fine-grained Group III granites form small laccoliths and have low REE contents and positive Eu anomalies. The negative epsilon(Nd)(t) and epsilon(Hf)(t) values, abundant inherited zircons, moderately light REE and LILE enrichment, and HFSE depletion indicate that the Damxung granitoids were derived mainly by the partial melting of a metapelitic source. Further studies proposed that group I and II samples with high contents of incompatible elements and negative Eu anomalies represent fractionated melts, whereas group III samples with low REE contents and positive Eu anomalies represent cumulates. The age distribution pattern of inherited zircons supports the interpretation that the Lhasa terrane rifted away from the northern margin of the Indian plate. Considering previously published data in the Lhasa terrane, we suggest that the Early Jurassic magmatism could be related to a period of subducted oceanic slab roll-back, which provides new insights into the evolution process of the Neo-Tethyan ocean realm. (C) 2021 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
关键词	LHASA TERRANE IMPLICATIONS U-PB GEOCHRONOLOGY VOLCANIC-ROCKS TRACE-ELEMENT FRACTIONAL CRYSTALLIZATION HYDROTHERMAL ZIRCON TECTONIC EVOLUTION GANGDESE BATHOLITH YEBA FORMATION NEO-TETHYS
英文关键词	Early Jurassic; Highly fractionated granites; Fractional crystallization; Slab roll-back; South Tibet
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000702840000004
来源期刊	GONDWANA RESEARCH
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260572
推荐引用方式 GB/T 7714	Wang, Chao,Ding, Lin,Zhang, Li-Yun,et al. Early Jurassic S-type granitoids in the Nyainqentanglha Range, South Tibet: A record of slab roll-back of subducted Neo-Tethyan Ocean[J]. 中国科学院青藏高原研究所,2022,101.
APA	Wang, Chao,Ding, Lin,Zhang, Li-Yun,Li, Jin-Xiang,&Yue, Ya-Hui.(2022).Early Jurassic S-type granitoids in the Nyainqentanglha Range, South Tibet: A record of slab roll-back of subducted Neo-Tethyan Ocean.GONDWANA RESEARCH,101.
MLA	Wang, Chao,et al."Early Jurassic S-type granitoids in the Nyainqentanglha Range, South Tibet: A record of slab roll-back of subducted Neo-Tethyan Ocean".GONDWANA RESEARCH 101(2022).