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

文献类型：期刊论文

作者Jiang, Xiao-Yan1; Li, He2,3; Ding, Xing1,4; Wu, Kai1,5; Guo, Jia1,5; Liu, Ji-Qiang6; Sun, Wei-Dong2,3,4
刊名LITHOS
出版日期2018-04-01
卷号304页码:125-134
ISSN号0024-4937
关键词Apatite Geochemical characteristics A-type granite Fluid metasomatism Lower Yangtze River Belt
DOI10.1016/j.lithos.2018.02.005
通讯作者Li, He(lihe@qdio.ac.cn) ; Sun, Wei-Dong(weidongsun@qdio.ac.cn)
英文摘要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.
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]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
出版者ELSEVIER SCIENCE BV
WOS记录号WOS:000430029800008
源URL[http://ir.qdio.ac.cn/handle/337002/158749]  
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
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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来源：海洋研究所

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