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兰州大学机构库  > 地质科学与矿产资源学院  > 期刊论文
题名: The volatile conditions of ore-forming magma for the Xiarihamu Ni-Cu sulfide deposit in East Kunlun orogenic belt, western China: Constraints from chemical and carbon isotopic compositions of volatiles
作者: Tang, QY; Li, JP; Zhang, MJ; Song, Z; Dang, YX; Du, L
收录类别: SCIE
出版日期: 2017-01
刊名: ACTA PETROLOGICA SINICA
卷号: 33, 期号:1-1, 页码:104-114
期刊主办单位: 中国矿物岩石地球化学学会 ; 中国科学院地质与地球物理研究所
出版者: SCIENCE CHINA PRESS
出版地: BEIJING
英文摘要: The newly-discovered Xiarihamu magmatic Ni-Cu sulfide deposit in the East Kunlun orogenic belt, China is the largest one ever found in arc settings. In this study, the chemical and carbon isotopic compositions of volatiles in pyroxene crystals of different types of rocks from the Early Devonian Xiarihamu mafic-ultramafic intrusion were measured with a stepwise heating mass spectrometer. The results showed the total volatiles released from mineral separates in Xiarihamu deposit have relatively low contents with an average of 888mm(3). STP/g (STP-standard temperature and pressure). The volatiles were dominated by H2O (48mol%), with minor H-2 (26%), CO2 (15%) and CO (5%). The H2S contents gradually increased from lherzolite (10mm(3)/g), olivine websterite (18mm(3)/ g) to websterite (28mm(3)/g), indicating that some sulfur-bearing components has been added into the magma during its evolution. The delta C-13 values of CO, ranging from-23. 5 parts per thousand to- 5. 0 parts per thousand were plotted in the area between crust and mantle. The delta(13)Cvalues of CH4, C2H6, C3H6 and C4H10 etc. methane homologues showed the normal distribution pattern of carbon isotopic composition among CH4 to C4H10 in most of the samples, and partial reversal distribution pattern in some samples, which were attributed to the thermogenic hydrocarbon gases by oceanic organic materials. The rather low H2O and high H-2 contents in Xiarihamu mafic-ultramafic rocks indicated that the magma was formed in a reduced volatile condition, and the oceanic sedimentary rock could be subducted into the mantle. Country rock contamination and the addition of S-rich fluid to the magma chamber may be the main mechanism for sulfide saturation in Xiarihamu magmatic Ni-Cu sulfide deposit.
关键词: Origin ; Carbon isotope ; Volatiles ; Magmatic Ni-Cu sulfide deposit ; Xiarihamu ; East Kunlun ; China
作者部门: [Tang QingYan ; Li JianPing ; Zhang MingJei ; Song Zhe ; Dang YongXi] Lanzhou Univ, Sch Earth Sci, Gansu Key Lab Mineral Resources Western China, Lanzhou 730000, Peoples R China ; [Du Li] Chinese Acad Sci, Inst Geol & Geophys, Gansu Key Lab Petr Resource Res, Lanzhou 730000, Peoples R China
通讯作者: Tang, QY (reprint author), Lanzhou Univ, Sch Earth Sci, Gansu Key Lab Mineral Resources Western China, Lanzhou 730000, Peoples R China.
学科分类: Geology
文章类型: Article
语种: 中文
ISSN号: 1000-0569
WOS记录号: WOS:000393257900009
IR记录号: WOS:000393257900009
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内容类型: 期刊论文
URI标识: http://ir.lzu.edu.cn/handle/262010/189137
Appears in Collections:地质科学与矿产资源学院_期刊论文

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Recommended Citation:
Tang, QY,Li, JP,Zhang, MJ,et al. The volatile conditions of ore-forming magma for the Xiarihamu Ni-Cu sulfide deposit in East Kunlun orogenic belt, western China: Constraints from chemical and carbon isotopic compositions of volatiles[J]. ACTA PETROLOGICA SINICA,2017,33(1-1):104-114.
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