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题名: Noble gas isotopic constraints on the origin and evolution of the Jinchuan Ni-Cu-(PGE) sulfide ore-bearing ultramafic intrusion, Western China
作者: Zhang, MJ(张铭杰); Tang, QY; Hu, PQ; Ye, XR; Cong, YA
收录类别: SCIE ; EI
出版日期: 2013-02-15
刊名: CHEMICAL GEOLOGY
卷号: 339, 页码:301-312
出版者: ELSEVIER
出版地: AMSTERDAM
英文摘要: The Jinchuan Ni-Cu-PGE sulfide deposit in Western China is the largest single magmatic sulfide deposit hosted by a small ultramafic intrusion in the world. The abundances and isotopic compositions of He, Ne and Ar in 23 silicate and sulfide mineral separates from peridotites, pyroxenites and sulfide ores have been determined by stepwise heating to investigate the formation and evolution of the intrusion and associated sulfide ores. Intriguingly, the volatiles released from elevated temperatures (400-1300 degrees C) are all characterized by low He-3/He-4 (<1 Ra) that are close to crustal value, varying He-3/He-4, Ne-21/Ne-22, N-20/Ne-22 and Ar-40/Ar-36 ratios suggest a mixture of crust, mantle and air components. Numerical modeling reveals that the apparent "crustal signatures" of the noble gases released from the Jinchuan samples are due to significant radiogenic production from U and Th decay after the crystallization from magma derived from a subcontinental lithospheric mantle at similar to 830 Ma. In contrast, the noble gases released at low temperatures (200-400 degrees C) are characterized by abundant atmosphere-origin components, suggesting that they are mainly derived from secondary fluid inclusions. The noble gases in the 400-1300 degrees C fractions collectively exhibit a negative correlation between He-3/He-4 and He-4, and a positive correlation between Ar-40/Ar-36 and Ar-40, which are consistent with significant radiogenic ingrowths. The sulfide separates have slightly higher He-3/He-4 ratios than coexisting silicates in the intrusion, indicating more abundant radiogenic components in the latter. Mass balance calculations of He and Ar isotopic mixing models indicate that about 20% crustal fluid and 63% air saturated fluid (ASF) were added into ore-forming magma. Our data are consistent with a recent suggestion by some researchers that significant amounts of crustal fluids were added to the parental magma of the Jinchuan intrusion. (c) 2012 Elsevier B.V. All rights reserved.
关键词: Noble gas isotopes ; Ni-Cu-(PGE) ore deposit ; Ultramafic rocks ; Jinchuan, China
作者部门: [Zhang, Mingjie ; Tang, Qingyan ; Hu, Peiqing ; Cong, Yanan] Lanzhou Univ, Sch Earth Sci, Key Lab Western Chinas Environm Syst MOE, Lanzhou 730000, Peoples R China ; [Ye, Xianren] Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resource Res, Lanzhou 730000, Peoples R China
通讯作者: Zhang, MJ (reprint author), Lanzhou Univ, Sch Earth Sci, Key Lab Western Chinas Environm Syst MOE, Lanzhou 730000, Peoples R China.
学科分类: Geochemistry & Geophysics
文章类型: Article
所属项目编号: China 973 Program [2012CB214701] ; NSF of China [41072056, 40772058, 91014003] ; SinoProbe [201011058] ; MOE Major Project [311010] ; CGS Fund [1212011121092]
所属项目名称: 国家自然科学基金项目 ; 国家重点基础研究发展计划以及国家重大科学研究计划(973计划) ; 教育部科学技术研究重大项目
项目资助者: NSFC ; MOST ; MOE
语种: 英语
DOI: 10.1016/j.chemgeo.2012.07.023
ISSN号: 0009-2541
WOS记录号: WOS:000316423200028
EI记录号: 20130816038796
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内容类型: 期刊论文
URI标识: http://ir.lzu.edu.cn/handle/262010/120622
Appears in Collections:地质科学与矿产资源学院_期刊论文

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Recommended Citation:
Zhang, MJ,Tang, QY,Hu, PQ,et al. Noble gas isotopic constraints on the origin and evolution of the Jinchuan Ni-Cu-(PGE) sulfide ore-bearing ultramafic intrusion, Western China[J]. CHEMICAL GEOLOGY,2013,339:301-312.
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