气候变化领域集成服务门户(CCPortal): Petrology, geochemistry and geochronology of Maoershan garnet amphibolite from central Qiangtang, Tibet

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DOI	10.18654/1000.0569/2023.12.09
	Petrology, geochemistry and geochronology of Maoershan garnet amphibolite from central Qiangtang, Tibet
	Li Chao; Wang GenHou; Zhao ZhongBao; Yang Feng; Li Dian; Wen JunHao; Wang ShiLin; Li HaiBing
发表日期	2023
ISSN	1000-0569
EISSN	2095-8927
起始页码	3661
结束页码	3684
卷号	39 期号:12
英文摘要	Early Paleozoic metamorphic records were preserved in the Maoershan accretionary complex in the central Qiangtang in the hinterland of the Qinghai -Tibetan Plateau, which is of great significance for studying the Early Paleozoic tectonic evolution of the northern margin of the Gondwana. The Maoershan garnet amphibolite occurs as lenticular inside the amphibolite, and it is mainly composed of garnet, hornblende, diopside, plagioclase, muscovite, zoisite, chlorite, sphene and ilmenite. The whole -rock geochemical analysis of the garnet amphibolite shows that it has the characteristics of ophiolite in the subduction zone ( SSZ type), which is consistent with the Cambrian -Ordovician ophiolite remnants in the region. According to petrography, mineral chemistry, phase equilibrium simulation and zircon dating results, the genesis and metamorphic process of the garnet amphibolite are revealed as follows: (1) The protolith of the garnet amphibolite was ophiolite remnant formed in the Tethys Ocean at similar to 477Ma; (2) The granulite facies metamorphism occurred in 394 similar to 383 Ma, with the peak metamorphism P-T conditions of similar to 900 degrees C and 1. 55GPa and the mineral assemblage of garnet + amphibole + diopside; (3) Early exhumation lead to the decrease of P-T to 800 degrees C and similar to 1. OGPa, with the mineral assemblage of garnet + amphibole + diopside + plagioclase; ( 4) The further amphibolite facies retrograde metamorphism
关键词	Qiangtang terrane in the central Tibetan Plateau Maoershan accretionary complex Garnet amphibolite P-T-t path Paleo-Tethys Ocean
英文关键词	MINERAL EQUILIBRIA CALCULATIONS; PALEOZOIC TECTONIC EVOLUTION; PARTIAL MELTING EQUILIBRIA; NORTHERN TIBET; METAMORPHIC PETROLOGY; BACK-ARC; CONTINENTAL-CRUST; VOLCANIC-ROCKS; TETHYS OCEAN; CONSTRAINTS
WOS研究方向	Geology
WOS记录号	WOS:001152994000009
来源期刊	ACTA PETROLOGICA SINICA
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283332
作者单位	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 National Institute of Standardization; China University of Geosciences - Beijing; Chengdu University of Technology; Sinopec
推荐引用方式 GB/T 7714	Li Chao,Wang GenHou,Zhao ZhongBao,et al. Petrology, geochemistry and geochronology of Maoershan garnet amphibolite from central Qiangtang, Tibet[J],2023,39(12).
APA	Li Chao.,Wang GenHou.,Zhao ZhongBao.,Yang Feng.,Li Dian.,...&Li HaiBing.(2023).Petrology, geochemistry and geochronology of Maoershan garnet amphibolite from central Qiangtang, Tibet.ACTA PETROLOGICA SINICA,39(12).
MLA	Li Chao,et al."Petrology, geochemistry and geochronology of Maoershan garnet amphibolite from central Qiangtang, Tibet".ACTA PETROLOGICA SINICA 39.12(2023).