气候变化领域集成服务门户(CCPortal): Mesozoic felsic magmatism along the Bangong-Nujiang suture zone, Tibet: Temporospatial variations and tectonic implications

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DOI	10.1016/j.gr.2023.09.004
	Mesozoic felsic magmatism along the Bangong-Nujiang suture zone, Tibet: Temporospatial variations and tectonic implications
	Wang, Wei; Zhai, Qing-guo; Hu, Pei-yuan; Tang, Yue
发表日期	2024
ISSN	1342-937X
EISSN	1878-0571
起始页码	284
结束页码	300
卷号	125
英文摘要	The subduction history and closure of the Meso-Tethys Ocean have not yet been well constrained using data from felsic rocks along the Bangong-Nujiang suture zone. Here we present geochronological, geo-chemical, and isotopic data from Early Jurassic-Late Cretaceous felsic rocks in the Laguo Co area of central Tibet. We combine our results with published data from coeval felsic rocks to explore the temporospatial variations in magmatism and the implications for subduction in and closure of the Meso-Tethys Ocean. The studied rocks include 182-180 Ma granodiorite, 109 Ma granite porphyry, and 68 Ma rhyolite, and zircon grains from each yield different eH eta t) values (+8.9 to +14.0,-5.5 to +0.7, and-4.9 to +1.1, respec-tively). The rocks have low-K tholeiitic to medium-K calc-alkaline compositions, low Y and Yb contents, and positive Sr anomalies. These data suggest an oceanic source for the Early Jurassic granodiorite and a crustal source for the Cretaceous granite porphyry and rhyolite, as well as a tectonic transition from an oceanic arc during the Early Jurassic to continental collision during the Cretaceous. The temporospatial variation in felsic magmatism corresponds to intra-oceanic subduction, bidirectional subduction, oceanic ridge or flat subduction, slab rollback, slab breakoff or sinking, and lithospheric delamination. The timing of closure of the Meso-Tethys Ocean is constrained to the Jurassic-Cretaceous, as evidenced by the major differences of the magma sources and formation processes between the Jurassic and Cretaceous felsic rocks. Finally, we present a model showing that oceanic closure occurred earlier in the east and north and later in the west and south.(c) 2023 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
关键词	Tibetan Plateau Meso-Tethys Ocean Felsic magmatism Temporospatial evolution Diachronous closure
英文关键词	LHASA-QIANGTANG COLLISION; A-TYPE GRANITES; SOUTHERN QIANGTANG; MAGNESIAN ANDESITES; PLATEAU EVIDENCE; INTRUSIVE ROCKS; MIDDLE SEGMENT; VOLCANIC-ROCKS; CRUSTAL GROWTH; ARC MAGMATISM
WOS研究方向	Geosciences, Multidisciplinary
WOS记录号	WOS:001081407300001
来源期刊	GONDWANA RESEARCH
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283184
作者单位	Guizhou University; China Geological Survey; Institute of Geology, Chinese Academy of Geological Sciences; Chinese Academy of Geological Sciences; Ministry of Natural Resources of the People's Republic of China; China Geological Survey; Institute of Geology, Chinese Academy of Geological Sciences; Chinese Academy of Geological Sciences
推荐引用方式 GB/T 7714	Wang, Wei,Zhai, Qing-guo,Hu, Pei-yuan,et al. Mesozoic felsic magmatism along the Bangong-Nujiang suture zone, Tibet: Temporospatial variations and tectonic implications[J],2024,125.
APA	Wang, Wei,Zhai, Qing-guo,Hu, Pei-yuan,&Tang, Yue.(2024).Mesozoic felsic magmatism along the Bangong-Nujiang suture zone, Tibet: Temporospatial variations and tectonic implications.GONDWANA RESEARCH,125.
MLA	Wang, Wei,et al."Mesozoic felsic magmatism along the Bangong-Nujiang suture zone, Tibet: Temporospatial variations and tectonic implications".GONDWANA RESEARCH 125(2024).