Insights into the origin of coexisting A(1)- and A(2)-type granites: Implications from zircon Hf-O isotopes of the Huayuangong intrusion in the Lower Yangtze River Belt, eastern China

doi:10.1016/j.lithos.2018.08.008

	Insights into the origin of coexisting A(1)- and A(2)-type granites: Implications from zircon Hf-O isotopes of the Huayuangong intrusion in the Lower Yangtze River Belt, eastern China
	Jiang, Xiao-Yan 1; Ling, Ming-Xing 3,5; Wu, Kai 1,6; Zhang, Zhe-Kun 1,6; Sun, Wei-Dong2,4,5,6 ; Sui, Qing-Lin 7; Xia, Xiao-Ping 3
	2018-10-01
发表期刊	LITHOS
ISSN	0024-4937
卷号	318 页码:230-243
通讯作者	Jiang, Xiao-Yan(jiangxy@gig.ac.cn) ; Sun, Wei-Dong(weidongsun@qdio.ac.cn)
摘要	The origin of A-type granites has been the subject of great debate, especially the enigmatic synchronous A(1)- and A(2)-type granites. Cretaceous (similar to 125 Ma) A(1)- and A(2)-type granites are common throughout the Lower Yangtze River Belt (LYRB), eastern China. However, their genesis still remains unclear. In this study, in-situ zircon Oisotopic data and chemical compositions of the Huayuangong (HYG) A-type granites in Anhui province, provide new insights into the origin and evolution of A-type granites in the LYRB, as well as the genetic link for synchronous A(1)- and A(2)-type granites. The HYG granites include syenogranite (75.9 wt%-76.6 SiO2) and quartz syenite (66.1 wt%-66.9 wt% SiO2). Both are metaluminous and belong to ferroan series. They are characterized by high alkalis (K2O + Na2O = 8.36 wt%-8.55 wt% and 11.7 wt%-11.9 wt%), high field strength elements (Zr + Nb + Ce + Y = 909 ppm-1269 ppm and 1092 ppm-1329 ppm) and high Ga/Al ratios (10,000 * Ga/Al = 4.91-4.96 and 2.64-2.68). The zircon saturation thermometer results indicate high magmatic temperatures (896-964 degrees C and 860-882 degrees C). All those geochemical features show an A-type granite affinity. They can be further classified into A(1)- and A(2)-type granites, corresponding to reduced and oxidized A-type granites, respectively. Additionally, the in-situ zircon O-Hf isotope compositions are also distinctly different, with delta O-18 = 4.7 parts per thousand-6.0 parts per thousand and epsilon(Hf)(t) = -1.5 to -3.6 for A(1)-type granites, and delta O-18 = 7.0 parts per thousand-7.8 parts per thousand and epsilon(Hf)(t) = 3.3 to 6.9 for A(2)-type granites. The geochemical signatures and newly discovered delta O-18 and epsilon(Hf)(t)values of the two A-type granite subgroups, indicate that they were derived from different source components and under disparate physicochemical conditions (e.g.,temperature, redox state and water contents). Lithospheric mantle-like isotopic data from zircons of Artype granites suggest fractional crystallization of reduced, anhydrous basaltic magmas resulting in the formation of A(1)-type granites. In contrast, A2-type granites with relatively high delta O-18 and negative epsilon Hf values were generated from partial melting of the lithospheric mantle which was metasomatized by slab-derived melts/fluids. The coexisting A(1)- and A(2)-type granites were formed under the extensional setting where lithospheric thinning and asthenosphere upwelling occurred. (C) 2018 Elsevier B.V. All rights reserved.
关键词	A-type granite Zircon Hf-O isotopes Petrogenesis Physicochemical conditions Lower Yangtze River Belt
DOI	10.1016/j.lithos.2018.08.008
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] ; National Natural Science Foundation of China[41703010] ; China Postdoctoral Science Foundation[Y701092001] ; China Postdoctoral Science Foundation[IS-0000] ; National Key R&D Program of China[2016YFC0600408] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB18000000] ; National Natural Science Foundation of China[41703010] ; China Postdoctoral Science Foundation[Y701092001] ; China Postdoctoral Science Foundation[IS-0000]
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
WOS类目	Geochemistry & Geophysics ; Mineralogy
WOS记录号	WOS:000449141300016
出版者	ELSEVIER SCIENCE BV
引用统计	被引频次：34[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/337002/156400
专题	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.Chinese Acad Sci, Guangzhou Inst Geochem, 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, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China 4.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao 266071, Peoples R China 5.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China 6.Univ Chinese Acad Sci, Beijing 100094, Peoples R China 7.Xian Inst Geol & Mineral Resources, Xian 710054, Shaanxi, Peoples R China
通讯作者单位	深海极端环境与生命过程研究中心
推荐引用方式 GB/T 7714	Jiang, Xiao-Yan,Ling, Ming-Xing,Wu, Kai,et al. Insights into the origin of coexisting A(1)- and A(2)-type granites: Implications from zircon Hf-O isotopes of the Huayuangong intrusion in the Lower Yangtze River Belt, eastern China[J]. LITHOS,2018,318:230-243.
APA	Jiang, Xiao-Yan.,Ling, Ming-Xing.,Wu, Kai.,Zhang, Zhe-Kun.,Sun, Wei-Dong.,...&Xia, Xiao-Ping.(2018).Insights into the origin of coexisting A(1)- and A(2)-type granites: Implications from zircon Hf-O isotopes of the Huayuangong intrusion in the Lower Yangtze River Belt, eastern China.LITHOS,318,230-243.
MLA	Jiang, Xiao-Yan,et al."Insights into the origin of coexisting A(1)- and A(2)-type granites: Implications from zircon Hf-O isotopes of the Huayuangong intrusion in the Lower Yangtze River Belt, eastern China".LITHOS 318(2018):230-243.

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