Igneous rocks geochemistry, zircon U-Pb age and its geological significance in the central section of Xiemisitai area, Xinjiang

	Igneous rocks geochemistry, zircon U-Pb age and its geological significance in the central section of Xiemisitai area, Xinjiang
	Meng Lei 1,2; Shen Ping 1; Shen YuanChao 1; Liu TieBing 1; Song GuoXue 1; Dai HuaWu 1; Li ChengKai 2; Lang ZeSong 2
刊名	ACTA PETROLOGICA SINICA
	2010-10-01
卷号	26 期号:10 页码:3047-3056
关键词	Igneous rocks Geochemistry SIMS zircon U-Pb date Island arc the central section of the Xiemisitai
ISSN号	1000-0569
文献子类	Article
英文摘要	The igneous rocks, occurred in the central section of the Xiemisitai area in Xinjiang, are made of the andesite, dacite and rhyolite. Geochemical data indicate that the igneous rocks have a high-K calc-alkaline composition (K2O = 3. 42% similar to 9. 85%; Na2O =0.48% similar to -5.30%), and are enriched in large ion lithophile elements (LILE) and depleted in high field strength elements (HFSE) with a clear negative Nb, P and Ti anomaly. REE patterns show distinct enrichments in LREE relative to HREE. Lead isotope composition of the rocks span a narrow range (Pb-206/Pb-204 =18. 435 similar to 19. 409, (207)pb/Pb-204 = 15. 535 similar to 15. 602, Pb-208/Pb-204 = 38.361 similar to 39.213). The rocks also exhibit high initial epsilon(Nd)(t) (+ 4. 43 similar to + 6.65) ratios and low initial Sr-87/Sr-86 values (0.700953 similar to 0. 704435). Volcanic activity occurred at 422.5 +/- 1. 9Ma based on U-Pb (SIMS) analyses of zircons from the rhyolite. These data are consistent with a mature arc and suggest that the volcanic rocks were derived from the partial melting of multiple sources including oceanic crust and enriched mantle, with melts undergoing significant crystal fractionation and minor crustal assimilation during convergence between the paleo-Junggar ocean and the Xiemisitai mature arc in Late Silurian.
WOS关键词	TECTONIC EVOLUTION ; NORTHERN XINJIANG ; NW CHINA ; OPHIOLITIC MELANGE ; TRACE-ELEMENT ; WEST JUNGGAR ; ISOTOPE ; ND ; MINERALIZATION ; GEOCHRONOLOGY
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000284450800016
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/72154]
专题	中国科学院地质与地球物理研究所
通讯作者	Meng Lei
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 2.China Nonferrous Met Resource Geol Survey, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Meng Lei,Shen Ping,Shen YuanChao,et al. Igneous rocks geochemistry, zircon U-Pb age and its geological significance in the central section of Xiemisitai area, Xinjiang[J]. ACTA PETROLOGICA SINICA,2010,26(10):3047-3056.
APA	Meng Lei.,Shen Ping.,Shen YuanChao.,Liu TieBing.,Song GuoXue.,...&Lang ZeSong.(2010).Igneous rocks geochemistry, zircon U-Pb age and its geological significance in the central section of Xiemisitai area, Xinjiang.ACTA PETROLOGICA SINICA,26(10),3047-3056.
MLA	Meng Lei,et al."Igneous rocks geochemistry, zircon U-Pb age and its geological significance in the central section of Xiemisitai area, Xinjiang".ACTA PETROLOGICA SINICA 26.10(2010):3047-3056.