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

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	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
	Tang QingYan 1; Li JianPing 1; Zhang MingJei 1; Song Zhe 1; Dang YongXi 1; Du Li 2
刊名	ACTA PETROLOGICA SINICA
	2017
卷号	33 期号:1 页码:104-114
关键词	Origin Carbon Isotope Volatiles Magmatic Ni-cu Sulfide Deposit Xiarihamu East Kunlun China
ISSN号	1000-0569
文献子类	Article
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.
WOS关键词	GEODYNAMIC IMPLICATIONS ; OXIDATION-STATE ; TIBET PLATEAU ; NW CHINA ; SULFUR ; GEOCHEMISTRY ; GENESIS ; GEOCHRONOLOGY ; SATURATION ; INCLUSIONS
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000393257900009
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/53113]
专题	地质与地球物理研究所_兰州油气中心
通讯作者	Tang QingYan
作者单位	1.Lanzhou Univ, Sch Earth Sci, Gansu Key Lab Mineral Resources Western China, Lanzhou 730000, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Gansu Key Lab Petr Resource Res, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Tang QingYan,Li JianPing,Zhang MingJei,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):104-114.
APA	Tang QingYan,Li JianPing,Zhang MingJei,Song Zhe,Dang YongXi,&Du Li.(2017).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.ACTA PETROLOGICA SINICA,33(1),104-114.
MLA	Tang QingYan,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".ACTA PETROLOGICA SINICA 33.1(2017):104-114.