Single-grain mica Rb-Sr isochron ages and mineral chemistry for the Weishan pluton in Hunan Province and implications on petrogenesis and mineralization of Mesozoic composite granite in South China

	Single-grain mica Rb-Sr isochron ages and mineral chemistry for the Weishan pluton in Hunan Province and implications on petrogenesis and mineralization of Mesozoic composite granite in South China
	Ding Xing 1; Sun WeiDong 2; Wang FangYue 3; Chen LinLi 1; Li QiuLi 4; Chen FuKun 3
刊名	ACTA PETROLOGICA SINICA
	2012-12-01
卷号	28 期号:12 页码:3823-3840
关键词	Single-grain mica Rb-Sr age Biotite Primary muscovite Secondary muscovite Weishan granite South China
ISSN号	1000-0569
文献子类	Article
英文摘要	Petrogenesis and mineralization on numerous Mesozoic composite granites in South China is the subject of an ongoing debate. This paper reports biotite and muscovite single-grain mineral Rb-Sr ages and geochemical results for the Weishan granite, a typical Mesozoic composite granitic pluton in South China that includes Xinpu highly-evolved granite, Tangshi biotite monzogranite and Xiangzikou two-mica granite, probing into multistage magmatisms and implications for the petrogenetic and metallogenic processes. The results show that (1) biotite that crystallized at 227.0 +/- 13Ma (MSWD = 1.6) from the Xinpu highly-evolved granite is low in Al, Mg, Rb and ACNK ratios, but high in Fe and Fe/(Fe + Mg) ratios; (2) biotite that crystallized at 221.9 +/- 5.8Ma (MSWD = 3.8) from the Weishan's main body, the Tangshi biotite monzogranite, is high in Mg and Sr, but low Fe/(Fe + Mg) and Rb/Sr ratios; and (3) biotite from the Xiangzikou two-mica granite, formed at 210.1 +/- 3.3Ma (MSWD = 0.21) that were determined by single-grain muscovite Rb-Sr isochron age, is low Sr and high in Al, Rb, ACNK and Rb/Sr ratio; and (4) muscovite from the Tangshi biotite monzogranite is formed during the hydrothermal process, and is characterized by very low concentrations for most major and trace elements and high Fe/(Fe + Mg), Cs/Nb, Rb/Sr ratios, whereas muscovite from the Xiangzikou two-mica granite is formed by metasomatisms of biotite and K-feldspar etc., with higher Al, Ti and Na. The magma temperature and oxygen fugacity drop from the Tangshi biotite monzogranite to the Xiangzikou two-mica granite, finally to the Xinpu highly-evolved granite, while the magma for the Xiangzikou two-mica granite was involved in more pelitic sediments. Muscovite from the Xiangzikou two-mica granite is secondary in origin, and thus cannot be used as a pressure indicator to designate another magma source. The clear fractionation trends of biotite and muscovite compositions claim kindred among multistage magmas for the Weishan composite granite, which were mainly derived from a single psammite magma chamber, and intruded in batches under different tectonic regimes after extensive fractional crystallization and assimilation. Both of the Xinpu highly-evolved granite and the Xiangzikou two-mica granite are potential sources for uranium mineralization, but the latter shows a better perspective because of intense hydrothermal alternation.
WOS关键词	PERALUMINOUS GRANITOIDS ; TIN MINERALIZATION ; NOVA-SCOTIA ; ICP-MS ; BIOTITE ; MUSCOVITE ; ROCKS ; GEOCHEMISTRY ; DEPOSIT ; LA
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000313315700004
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/84452]
专题	中国科学院地质与地球物理研究所
通讯作者	Ding Xing
作者单位	1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangzhou 510640, Guangdong, Peoples R China 3.Univ Sci & Technol China, Sch Earth & Space Sci, Hefei 230026, Peoples R China 4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Ding Xing,Sun WeiDong,Wang FangYue,et al. Single-grain mica Rb-Sr isochron ages and mineral chemistry for the Weishan pluton in Hunan Province and implications on petrogenesis and mineralization of Mesozoic composite granite in South China[J]. ACTA PETROLOGICA SINICA,2012,28(12):3823-3840.
APA	Ding Xing,Sun WeiDong,Wang FangYue,Chen LinLi,Li QiuLi,&Chen FuKun.(2012).Single-grain mica Rb-Sr isochron ages and mineral chemistry for the Weishan pluton in Hunan Province and implications on petrogenesis and mineralization of Mesozoic composite granite in South China.ACTA PETROLOGICA SINICA,28(12),3823-3840.
MLA	Ding Xing,et al."Single-grain mica Rb-Sr isochron ages and mineral chemistry for the Weishan pluton in Hunan Province and implications on petrogenesis and mineralization of Mesozoic composite granite in South China".ACTA PETROLOGICA SINICA 28.12(2012):3823-3840.