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

	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 1,2; Yin, Changqing 1,2; Zhang, Jian 1,2; Jin, Xin 3
	2021-06-15
发表期刊	JOURNAL OF ASIAN EARTH SCIENCES
ISSN	1367-9120
卷号	213 页码:16
通讯作者	Qian, Jiahui([email protected])
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.
关键词	Garnet amphibolite Phase modeling High-temperature metamorphism Cathaysia Block South China
DOI	10.1016/j.jseaes.2021.104744
收录类别	SCI
语种	英语
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
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000647448700002
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：9[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/176772
专题	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.Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai, Peoples R China 3.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanog, Qingdao 266071, 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.

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