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An A(1)-type granite that borders A(2)-type: insights from the geochemical characteristics of the Zongyang A-type granite in the Lower Yangtze River Belt, China
Jiang, Xiao-Yan1; Wu, Kai7; Luo, Jin-Cheng1; Zhang, Li-Peng2; Sun, Wei Dong2,4,5,6; Xia, Xiao-Ping3
2019-11-21
Source PublicationINTERNATIONAL GEOLOGY REVIEW
ISSN0020-6814
Pages18
Corresponding AuthorJiang, Xiao-Yan(jiangxiagyan@mail.gyig.ac.cn) ; Sun, Wei Dong(weidongsun@gdio.ac.cn)
AbstractMesozoic A-type granites are widely distributed in the Lower Yangtze River Belt (LYRB) in China, but their petrogenesis and geodynamic settings are unresolved. Here, we describe geochronological and geochemical study of granites from the Zongyang area of the LYRB. Zircon LA-ICPMS U-Pb dating indicates the granites were emplaced at ca. 127 Ma. They have geochemical characteristics similar to those of A-type granites, with high total-alkali (10.5-10.7 wt.%), HFSEs (Zr + Nb + Ce + Y = 890-1011 ppm), high Ga/Al ratios (10,000 x Ga/Al = 3.19-3.25), and high whole-rock zircon saturation temperatures (850 degrees C-900 degrees C). In discrimination diagrams, samples plot in the A(1)-type granite field but close to the A(1)-A(2) boundary. A representative whole-rock sample yielded an I-Sr ratio of 0.7066 and an epsilon(Nd)(t) value of - 5.3, with zircon epsilon(Hf)(t) and delta O-18 values of - 0.2 to - 4.3 and 5.95 parts per thousand-6.79 parts per thousand, respectively, all higher than those of depleted mantle, indicating the enriched nature of source materials. Apatites in the granite display mantle-origin characteristics. Incompatible element ratios (Y/Nb, Y/Ta, Nb/U and Ce/Pb) also support the enriched mantle source, and suggest that the source had experienced metasomatism, or the existence of crustal input during magmatic processes. Significant depletions in Ba, Sr, P, Ti, and Eu in the granites indicate fractional crystallization of feldspar and some accessory minerals. We conclude that the Zongyang granite were formed through fractional crystallization of oceanic island basalt (OIB)-like basic magmas derived from the lithospheric mantle. They are classified as A(1) but their borderline A(2) nature is most likely due to metasomatism by slab-derived fluids or melts, possibly involving crustal materials. Our results, together with those of previous studies, indicate that LYRB A-type granites, are the products of partial melting of the mantle or lower continental crust in an extensional setting, caused by slab rollback during the subduction of the Paleo-Pacific Plate.
KeywordA-type granite geochemistry zircon Hf-O isotopes Lower Yangtze River Belt
DOI10.1080/00206814.2019.1689534
Indexed BySCI
Language英语
Funding ProjectNational Key R&D Program of China[2016YFC0600408] ; National Natural Science Foundation of China[41703010] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB18000000] ; China Postdoctoral Science Foundation[2017M612770]
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000497124100001
PublisherTAYLOR & FRANCIS INC
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/163832
Collection深海极端环境与生命过程研究中心
Corresponding AuthorJiang, Xiao-Yan; Sun, Wei Dong
Affiliation1.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang, Guizhou, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao, Shandong, Peoples R China
3.ChemistryChinese Acad Sci, Guangzhou Inst Geo, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China
4.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Qingdao, Shandong, Peoples R China
5.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China
6.Univ Chinese Acad Sci, Beijing, Peoples R China
7.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Shaanxi, Peoples R China
Corresponding Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Jiang, Xiao-Yan,Wu, Kai,Luo, Jin-Cheng,et al. An A(1)-type granite that borders A(2)-type: insights from the geochemical characteristics of the Zongyang A-type granite in the Lower Yangtze River Belt, China[J]. INTERNATIONAL GEOLOGY REVIEW,2019:18.
APA Jiang, Xiao-Yan,Wu, Kai,Luo, Jin-Cheng,Zhang, Li-Peng,Sun, Wei Dong,&Xia, Xiao-Ping.(2019).An A(1)-type granite that borders A(2)-type: insights from the geochemical characteristics of the Zongyang A-type granite in the Lower Yangtze River Belt, China.INTERNATIONAL GEOLOGY REVIEW,18.
MLA Jiang, Xiao-Yan,et al."An A(1)-type granite that borders A(2)-type: insights from the geochemical characteristics of the Zongyang A-type granite in the Lower Yangtze River Belt, China".INTERNATIONAL GEOLOGY REVIEW (2019):18.
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