Geochemistry and zircon U-Pb age of volcanic rocks from the Chagangnuoer and Zhibo iron deposits, western Tianshan, and their geological significance

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	Geochemistry and zircon U-Pb age of volcanic rocks from the Chagangnuoer and Zhibo iron deposits, western Tianshan, and their geological significance
	Jiang, ZS (Jiang ZongSheng); Zhang, ZH (Zhang ZuoHeng); Hou, KJ (Hou KeJun); Hong, W (Hong Wei); Wang, ZH (Wang ZhiHua); Li, FM (Li FengMing); Tian, JQ (Tian JingQuan)
刊名	ACTA PETROLOGICA SINICA
	2012
卷号	28 期号:7 页码:2074-2088
关键词	Volcanic rock Geochemistry Zircon U-Pb dating Chagangnuoer iron deposit Zhibo iron deposit Western Tianshan
ISSN号	1000-0569
英文摘要	The Chagangnuoer and Zhibo iron deposits occurring in eastern segment of western Tianshan, were hosted primarily by the Late Carboniferous volcanic rocks, which mainly contain basalt, basaltic andesite, trachyte and andesitic tuff. The tectonic setting and age of the volcanic rocks are key elements in the reconstruction of ore genesis. In this paper, representative samples of volcanic rocks from the Chagangnuoer and Zhibo iron deposits were analyzed for major, trace elements and zircon U-Pb dating to validate their tectonic setting and formation ages. Geochemical data indicate that most of the volcanic rocks range in composition from calc-alkaline, high-K calc-alkaline to shoshonitic, with light rare earth element(LREE) and large ion lithophile element(LILE; e. g., Rb, Th, K) enrichment and almost flat heavy rare earth element(HREE) patterns as well as strongly negative Nb, Ta and Ti anomalies, similar to features of arc volcanic rocks. In the plots of tectonic discrimination, the basaltic volcanic rocks are mainly projected in arc setting regions. LA-ICP-MS U-Pb dating of magmatic zircons from the rhyolite and dacite yield weighted average Pb-206/U-238 ages of 301.8 +/- 0.9Ma and 300.3 +/- 1.1Ma, respectively. In addition, weighted average Pb-206/U-238 ages from 303.8Ma to 305Ma were obtained for two diorites. The similar geochemical characteristics and formation ages of volcanic rocks and diorites indicated that they were sourced from the same parent magma and may formed in the same tectonic setting. Combined with the regional geological data, we therefore suggest that the high-K calc-alkaline to shoshonitic volcanic rocks were probably the products of continental island-arc magmatism during the late stage of subduction.
学科主题	火成岩岩石学
WOS关键词	TRACE-ELEMENT GEOCHEMISTRY ; NATURAL REFERENCE MATERIAL ; CALC-ALKALINE MAGMATISM ; NW-CHINA ; ISOTOPIC GEOCHEMISTRY ; TECTONIC EVOLUTION ; SHRIMP CHRONOLOGY ; XINJIANG ; MOUNTAINS ; PETROLOGY
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000306631600010
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39536]
专题	中国地质调查局
作者单位	Bur Geol & Mineral Resources Xinjiang, Kuerle 841000, Peoples R China
推荐引用方式 GB/T 7714	Jiang, ZS ,Zhang, ZH ,Hou, KJ ,et al. Geochemistry and zircon U-Pb age of volcanic rocks from the Chagangnuoer and Zhibo iron deposits, western Tianshan, and their geological significance[J]. ACTA PETROLOGICA SINICA,2012,28(7):2074-2088.
APA	Jiang, ZS .,Zhang, ZH .,Hou, KJ .,Hong, W .,Wang, ZH .,...&Tian, JQ .(2012).Geochemistry and zircon U-Pb age of volcanic rocks from the Chagangnuoer and Zhibo iron deposits, western Tianshan, and their geological significance.ACTA PETROLOGICA SINICA,28(7),2074-2088.
MLA	Jiang, ZS ,et al."Geochemistry and zircon U-Pb age of volcanic rocks from the Chagangnuoer and Zhibo iron deposits, western Tianshan, and their geological significance".ACTA PETROLOGICA SINICA 28.7(2012):2074-2088.