In situ U-Th-Pb ages of the Miaoya carbonatite complex in the South Qinling orogenic belt, central China

doi:10.1016/j.lithos.2017.08.003

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 岩石圈演化国家重点实验室

	In situ U-Th-Pb ages of the Miaoya carbonatite complex in the South Qinling orogenic belt, central China
	Ying, Yuancan 1; Chen, Wei 1; Lu, Jue 1; Jiang, Shao-Yong 1,2; Yang, Yueheng 3
刊名	LITHOS
	2017-10-01
卷号	290 页码:159-171
关键词	U-Th-Pb dating Zircon Monazite Columbite The Miaoya carbonatite complex
ISSN号	0024-4937
DOI	10.1016/j.lithos.2017.08.003
文献子类	Article
英文摘要	The Miaoya carbonatite complex in the South Qinling orogenic belt hosts one of the largest rare earth element (REE)-Nb deposits in China that is composed of carbonatite and syenite. The emplacement age of the complex and the geochronological relationship between the carbonatite and syenite have long been debated. In this study, in situ U-Th-Pb ages have been obtained for the constituent minerals zircon, monazite and columbite from carbonatite and syenite of the Miaoya complex, together with their chemical and isotopic compositions. In situ trace element compositions for zircon from carbonatite and syenite are highly variable. The zircon displays slightly heavy REE (HREE)-enriched chondrite-normalized patterns with no Eu anomaly and various light REE (LREE) contents. In situ Th-Pb dating for zircon from the Miaoya complex by laser ablation ICP-MS yields ages of 442.6 +/- 4.0 Ma (n = 53) for syenite and 426.5 +/- 8.0 Ma (n = 23) for carbonatite. Monazite from carbonatite and syenite shows similar chondrite-normalized REE patterns and yields a consistent Th-Pb age of-240 Ma. Based on petrographic and chemical composition, columbite from the carbonatite can be identified into two groups. The columbite dispersed within carbonatite is characterized by slightly LREE-enriched chondritenormalized REE patterns, whereas columbite associated with apatite is characterized by LREE-depleted trends. Columbite has been further determined to have a weighted mean Pb-206/U-238 age of 232.8 +/- 4.5 Ma (n = 9) using LA-ICP-MS. Detailed geochronological and chemical investigations suggest that there were two major episodes of magmatic/metasomatic activities in the formational history of the Miaoya carbonatite complex. The early alkaline magmatism emplaced in the Silurian was related to the opening of the Mianlue Ocean, whereas the late metasomatism or hydrothermal overprint occurred during the Triassic South Qinling orogeny. The latter serves as the major ore formation period for both REE (e.g., monazite) and Nb (e.g., columbite). (C) 2017 Elsevier B.V. All rights reserved.
WOS关键词	TRACE-ELEMENT COMPOSITION ; LA-ICP-MS ; WESTERN SICHUAN PROVINCE ; PLASMA-MASS SPECTROMETRY ; DALUCAO REE DEPOSIT ; ISOTOPIC CONSTRAINTS ; TECTONIC EVOLUTION ; HYDROTHERMAL PROCESSES ; DABIE MOUNTAINS ; INNER-MONGOLIA
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000413390700011
资助机构	National Key R&D Program of China(2017YFC0602405) ; National Natural Science Foundation of China(41673035 ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) ; special fund from the State Key Laboratory of Geological Processes and Mineral Resources(MSFGPMR03-2) ; 41402046 ; 41530211) ; National Key R&D Program of China(2017YFC0602405) ; National Natural Science Foundation of China(41673035 ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) ; special fund from the State Key Laboratory of Geological Processes and Mineral Resources(MSFGPMR03-2) ; 41402046 ; 41530211) ; National Key R&D Program of China(2017YFC0602405) ; National Natural Science Foundation of China(41673035 ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) ; special fund from the State Key Laboratory of Geological Processes and Mineral Resources(MSFGPMR03-2) ; 41402046 ; 41530211) ; National Key R&D Program of China(2017YFC0602405) ; National Natural Science Foundation of China(41673035 ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) ; special fund from the State Key Laboratory of Geological Processes and Mineral Resources(MSFGPMR03-2) ; 41402046 ; 41530211)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/61992]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者	Chen, Wei
作者单位	1.China Univ Geosci, Collaborat Innovat Ctr Explorat Strateg Mineral R, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Hubei, Peoples R China 2.Nanjing Univ, Dept Earth Sci, State Key Lab Mineral Deposits Res, Nanjing 210093, Jiangsu, Peoples R China 3.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	Ying, Yuancan,Chen, Wei,Lu, Jue,et al. In situ U-Th-Pb ages of the Miaoya carbonatite complex in the South Qinling orogenic belt, central China[J]. LITHOS,2017,290:159-171.
APA	Ying, Yuancan,Chen, Wei,Lu, Jue,Jiang, Shao-Yong,&Yang, Yueheng.(2017).In situ U-Th-Pb ages of the Miaoya carbonatite complex in the South Qinling orogenic belt, central China.LITHOS,290,159-171.
MLA	Ying, Yuancan,et al."In situ U-Th-Pb ages of the Miaoya carbonatite complex in the South Qinling orogenic belt, central China".LITHOS 290(2017):159-171.