Early Paleozoic high-temperature metamorphism of garnet amphibolite in the Longyou area, Cathaysia Block of South China: P & ndash;T path and tectonic implications

doi:10.1016/j.jseaes.2021.104744

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	Early Paleozoic high-temperature metamorphism of garnet amphibolite in the Longyou area, Cathaysia Block of South China: P & ndash;T path and tectonic implications
	Qian, Jiahui 1,3; Yin, Changqing 1,3; Zhang, Jian 1,3; Jin, Xin 2
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2021-06-15
卷号	213 页码:16
关键词	Garnet amphibolite Phase modeling High-temperature metamorphism Cathaysia Block South China
ISSN号	1367-9120
DOI	10.1016/j.jseaes.2021.104744
通讯作者	Qian, Jiahui(qianjh5@mail.sysu.edu.cn)
英文摘要	Garnet amphibolite can provide crucial information on tectonic processes. Recent progresses on garnet amphibolite in the Longyou area of the Cathaysia Block, South China have attracted geologists? wide concerns and discussions about the regional metamorphic history and geodynamic setting. The Longyou garnet amphibolite shows a prominent porphyroblastic texture involving garnet (-40 vol%), hornblende, clinopyroxene, quartz and ilmenite, with minor plagioclase (<5 vol%), sphene, rutile, pyrite and apatite. Garnet presents as aggregations with double-/multi-nuclear structure and has embayed rims surrounded by quartz and plagioclase. Clinopyroxene is partially replaced by late hornblende and plagioclase. A clockwise high-temperature P?T evolution involving four stages has been determined. The generalized prograde stage shows increases of P?T conditions. The Pmax and Tmax stages lie in P?T conditions of 13 ? 0.6 kbar/808 ? 13 ?C and 10 ? 0.9 kbar/840 ? 10 ?C, reflecting apparent thermal gradients of -17 ?C/km and 22?23 ?C/km, respectively. Both stages match medium-pressure facies series metamorphism. The late retrograde stage shows decompression and cooling. A P?XMg [=Mg/(Mg + Fe) in mole] pseudosection drawn at T = 840 ?C suggests that low bulk-rock XMg contents (=0.29?0.33) in the Longyou garnet amphibolite are responsible for the high content of garnet in the rock. A P?M (Na2O) pseudosection at T = 840 ?C reveals that the low content of plagioclase in the rock is caused by low bulkrock Na2O contents (=0.44?1.18 mol.%). The integrated P?T?t data from the Cathaysia Block indicate that the early Paleozoic metamorphism can be connected to an intraplate orogenic setting.
资助项目	Fundamental Research Funds for the Central Universities[18lgpy17] ; Guangdong Basic and Applied Basic Research Foundation[2019A1515012189] ; National Natural Science Foundation of China[41972197]
WOS研究方向	Geology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000647448700002
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/176771]
专题	海洋研究所_深海极端环境与生命过程研究中心
通讯作者	Qian, Jiahui
作者单位	1.Sun Yat Sen Univ, Sch Earth Sci & Engn, Guangdong Prov Key Lab Mineral Resources & Geol P, Guangzhou 510275, Guangdong, Peoples R China 2.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanog, Qingdao 266071, Peoples R China 3.Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai, Peoples R China
推荐引用方式 GB/T 7714	Qian, Jiahui,Yin, Changqing,Zhang, Jian,et al. Early Paleozoic high-temperature metamorphism of garnet amphibolite in the Longyou area, Cathaysia Block of South China: P & ndash;T path and tectonic implications[J]. JOURNAL OF ASIAN EARTH SCIENCES,2021,213:16.
APA	Qian, Jiahui,Yin, Changqing,Zhang, Jian,&Jin, Xin.(2021).Early Paleozoic high-temperature metamorphism of garnet amphibolite in the Longyou area, Cathaysia Block of South China: P & ndash;T path and tectonic implications.JOURNAL OF ASIAN EARTH SCIENCES,213,16.
MLA	Qian, Jiahui,et al."Early Paleozoic high-temperature metamorphism of garnet amphibolite in the Longyou area, Cathaysia Block of South China: P & ndash;T path and tectonic implications".JOURNAL OF ASIAN EARTH SCIENCES 213(2021):16.