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

doi:10.1080/00206814.2019.1689534

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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-Yan 2; Wu, Kai 1; Luo, Jin-Cheng 2; Zhang, Li-Peng 3; Sun, Wei Dong 3,5,6,7; Xia, Xiao-Ping 4
刊名	INTERNATIONAL GEOLOGY REVIEW
	2019-11-21
页码	18
关键词	A-type granite geochemistry zircon Hf-O isotopes Lower Yangtze River Belt
ISSN号	0020-6814
DOI	10.1080/00206814.2019.1689534
通讯作者	Jiang, Xiao-Yan(jiangxiagyan@mail.gyig.ac.cn) ; Sun, Wei Dong(weidongsun@gdio.ac.cn)
英文摘要	Mesozoic 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.
资助项目	National 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研究方向	Geology
语种	英语
出版者	TAYLOR & FRANCIS INC
WOS记录号	WOS:000497124100001
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/163831]
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	Jiang, Xiao-Yan; Sun, Wei Dong
作者单位	1.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Shaanxi, Peoples R China 2.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang, Guizhou, Peoples R China 3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao, Shandong, Peoples R China 4.ChemistryChinese Acad Sci, Guangzhou Inst Geo, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China 5.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Qingdao, Shandong, Peoples R China 6.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China 7.Univ Chinese Acad Sci, Beijing, Peoples R China
推荐引用方式 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.