Multiple stages of magma emplacement and mineralization of eastern Tianshan, Xinjiang: Examplified by the Huangshan Ni-Cu deposit.

	Multiple stages of magma emplacement and mineralization of eastern Tianshan, Xinjiang: Examplified by the Huangshan Ni-Cu deposit.
	Mao YaJing 1,2,3; Qin KeZhang 1,3; Tang DongMei 3; Xue ShengChao 2,3; Feng HongYe 4; Tian Ye 3
刊名	ACTA PETROLOGICA SINICA
	2014-06-01
卷号	30 期号:6 页码:1575-1594
关键词	Olivine Orthopyroxene Multi-stage mineralization Huangshan Ni-Cu sulfide deposit Eastern Tianshan
ISSN号	1000-0569
文献子类	Article
英文摘要	Huangshan orefield, consisting of Huangshan, Huangshandong, Xiangshan and Huangshannan four Ni-Cu deposits in the west part of Huangshan-Jinerquan Permian mafic-ultramafic belt, is the most important nickel mineralization area in northern Xinjiang. This study choose the Huangshan (Huangshanxi in international literature) large Ni-Cu deposit as an example to discuss the multiple stages magma emplacement and the associated mineralization, because all of the deposits in the Huangshan camp have formed by more than two magma stages. Huangshan Ni-Cu deposit is a concealed Ni-Cu deposit. Grain size and major oxides of olivine and orthopyroxene of the Huangshan Ni-Cu deposit varies from different lithofacies, vertically and horizontally. Based on these variations, this paper suggests that the Huangshan Ni-Cu deposit formed by three separated magmas. The compositional discrepancy of Fo value and Ni content in olivine from the bottom of olivine websterite (phase III) may caused by Fe-Ni exchange between sulfide melt and olivine. Olivine orthopyroxenite and hornblende lherzolite of phase III are the major ore-bearing lithofacies of the Huangshan deposit The Fo value in olivine crystals in phase III are similar in different rock types, while olivine in olivine orthopyroxenite and lherzolite have higher Ni content (500 x 10(-6) similar to 2050 x 10(-6)) than olivine in olivine websterite (160 x 10(-6) similar to 1000 x 10(-6)). Maximum grain 'size of bronzite in olivine orthopyroxenite and lherzolite (4 similar to 8mm) is much larger than these olivine websterite (24 mm). value, CaO and Cr2O3 contents of bronzite show repeated changes from the core to the rim, implying the magma composition have been interrupted during bronzite crystallization. The rim of olivine wrapped in clinopyroxene in phase III has higher Ni content than the core of the olivine (with similar Fo value) suggests magma replenishment during olivine crystallization. This, together with the vertical cross-section variation of Cu, Ni, Co in drill cores ZK06-18 and ZK06-04, indicates that the injection of fresh magma led to the enrichment of sulfides in the No. 30 ore body in the Huangshan deposit Magma conduit system can be used to explaine these characteristics. Therefore, local dilational and orientation changing places are favorable for Ni-Cu sulfide enrichment, and can also be regarded as further exploration lacations. On the comprehensive correlation of ore-bearing lithofacies among the Huangshan, Huangshandong, Xiangshan and Huangshannan Ni-Cu deposits within the Huangshan Orefield, both ultramafic and mafic lithofacies have explorational potential for Ni-Cu mineralization. More attention should be paid to the multistage magmatism and the associated mineralization during Ni-Cu exploration in Eastern Tianshan even the whole southern part of Central Asian Orogenic Belt.
WOS关键词	MAFIC-ULTRAMAFIC COMPLEXES ; NW CHINA IMPLICATIONS ; ASIAN OROGENIC BELT ; U-PB AGE ; SULFIDE DEPOSITS ; NORTH XINJIANG ; TECTONIC EVOLUTION ; PRINCIPAL CHARACTERISTICS ; GEOLOGICAL IMPLICATIONS ; CONTINENTAL GROWTH
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000338487400005
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/85333]
专题	中国科学院地质与地球物理研究所
通讯作者	Mao YaJing
作者单位	1.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Xinjiang Res Ctr Mineral Resource, Urumqi 830011, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 4.Hebei United Univ, Dept Geol, Tangshan 063009, Peoples R China
推荐引用方式 GB/T 7714	Mao YaJing,Qin KeZhang,Tang DongMei,et al. Multiple stages of magma emplacement and mineralization of eastern Tianshan, Xinjiang: Examplified by the Huangshan Ni-Cu deposit.[J]. ACTA PETROLOGICA SINICA,2014,30(6):1575-1594.
APA	Mao YaJing,Qin KeZhang,Tang DongMei,Xue ShengChao,Feng HongYe,&Tian Ye.(2014).Multiple stages of magma emplacement and mineralization of eastern Tianshan, Xinjiang: Examplified by the Huangshan Ni-Cu deposit..ACTA PETROLOGICA SINICA,30(6),1575-1594.
MLA	Mao YaJing,et al."Multiple stages of magma emplacement and mineralization of eastern Tianshan, Xinjiang: Examplified by the Huangshan Ni-Cu deposit.".ACTA PETROLOGICA SINICA 30.6(2014):1575-1594.