Formation of A-type granites in the Lower Yangtze River Belt: A perspective from apatite geochemistry

doi:10.1016/j.lithos.2018.02.005

	Formation of A-type granites in the Lower Yangtze River Belt: A perspective from apatite geochemistry
	Jiang, Xiao-Yan 1; Li, He 2,3; Ding, Xing 1,4; Wu, Kai 1,5; Guo, Jia 1,5; Liu, Ji-Qiang 6; Sun, Wei-Dong2,3,4
	2018-04-01
发表期刊	LITHOS
ISSN	0024-4937
卷号	304 页码:125-134
通讯作者	Li, He(lihe@qdio.ac.cn) ; Sun, Wei-Dong(weidongsun@qdio.ac.cn)
摘要	Apatite is ubiquitous in A-type granites, and can be used to elucidate the volatile contents of the silicate melt, which reflect its source characteristics. A-type granites have been recognized as a distinct group of granites. A(1)- and A(2)-type subgroups are produced under different extensional settings. However, the details of the mechanisms behind the distinctive geochemical characteristics of A(1)- and A(2)-type granites remain obscure. Belts of Cretaceous A(1)- and A(2)-type granites occur along the Lower Yangtze River Belt in eastern China. Here we investigated the major and trace element compositions of apatites from contemporary A(1)- and A(2)-type granites at different localities along the Lower Yangtze River Belt, in order to decipher their discrepant source processes. Apatites from A(1) and A(2)-type granites show similar major and trace elements, but differ in their F and Cl concentrations. Apatites from A(1)-type granites in the eastern part of the Lower Yangtze River Belt have much lower F and higher Cl concentrations compared to A(2)-type granites in the western part. Moreover, from the east to the west, the F concentrations of apatites from A(1)-type granites increase, while the Cl concentrations decline. In a subducted plate, F is retained by amphibole, chlorite, serpentine and mica minerals through the amphibolite stage, and finally by phengite and lawsonite during the eclogite stage, whereas, Cl is controlled by amphibole, chlorite and serpentine. The high and varied Cl concentrations in A(1) subgroup apatites, therefore, may be attributed to the breakdown of amphibole, chlorite and/or serpentine decomposition during partial melting of subducted oceanic crust releasing a large amount of Cl at shallower depth. In contrast, F is transported to deeper depths in the subducted oceanic crust, and released through breakdown of phengite and lawsonite, making an important contribution to the formation of A(2) -type granites. Apatites from A(1) and A(2)-type granite samples show regular changes in LREE/HREE, LREE/MREE and MREE/HREE ratios with increasing distance from the location of the subduction zone, probably as the result of nonsynchronous dehydration of the serpentine and phengite at different stages during subduction. We propose that A(1)- and A(2)-type granites on the Lower Yangtze River Belt were derived from sources metasomatised by fluids originating from the breakdown of amphibole, chlorite and/or serpentine with higher Cl, lower F, and from phengite and/or lawsonite with relatively higher F but lower Cl, respectively. (C) 2018 Elsevier B.V. All rights reserved.
关键词	Apatite Geochemical characteristics A-type granite Fluid metasomatism Lower Yangtze River Belt
DOI	10.1016/j.lithos.2018.02.005
收录类别	SCI
语种	英语
资助项目	National Key R&D Program of China[2016YFC0600408] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB18000000] ; China Postdoctoral Science Foundation[Y701092001] ; National Natural Science Foundation of China[41473029] ; National Key R&D Program of China[2016YFC0600408] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB18000000] ; China Postdoctoral Science Foundation[Y701092001] ; National Natural Science Foundation of China[41473029]
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
WOS类目	Geochemistry & Geophysics ; Mineralogy
WOS记录号	WOS:000430029800008
出版者	ELSEVIER SCIENCE BV
引用统计	被引频次：57[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/337002/158750
专题	深海极端环境与生命过程研究中心
通讯作者	Li, He; Sun, Wei-Dong
作者单位	1.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangzhou 510640, Guangdong, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China 3.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Qingdao 266071, Peoples R China 4.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China 5.Univ Chinese Acad Sci, Beijing 100094, Peoples R China 6.State Ocean Adm, SOA Key Lab Submarine Geociences, Inst Oceanog 2, Hangzhou 310012, Zhejiang, Peoples R China
通讯作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Jiang, Xiao-Yan,Li, He,Ding, Xing,et al. Formation of A-type granites in the Lower Yangtze River Belt: A perspective from apatite geochemistry[J]. LITHOS,2018,304:125-134.
APA	Jiang, Xiao-Yan.,Li, He.,Ding, Xing.,Wu, Kai.,Guo, Jia.,...&Sun, Wei-Dong.(2018).Formation of A-type granites in the Lower Yangtze River Belt: A perspective from apatite geochemistry.LITHOS,304,125-134.
MLA	Jiang, Xiao-Yan,et al."Formation of A-type granites in the Lower Yangtze River Belt: A perspective from apatite geochemistry".LITHOS 304(2018):125-134.

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