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题名: Sr-Nd-Os-S isotope and PGE geochemistry of the Xiarihamu magmatic sulfide deposit in the Qinghai-Tibet plateau, China
作者: Zhang, ZW; Tang, QY; Li, CS; Wang, YL; Ripley, E
收录类别: SCIE
出版日期: 2017-01
刊名: MINERALIUM DEPOSITA
卷号: 52, 期号:1-1, 页码:51-68
出版者: SPRINGER
出版地: NEW YORK
英文摘要: The newly discovered Xiarihamu Ni-Cu deposit is located in the Eastern Kunlun orogenic belt in the northern part of the Qinghai-Tibet plateau, western China. It is the largest magmatic Ni-Cu sulfide deposit found thus far in an arc setting worldwide and ranks second in China in terms of total Ni resources. Fe-Ni-Cu sulfide mineralization occurs in a small ultramafic body that is part of a larger mafic-ultramafic complex formed by protracted Silurian-Early Devonian basaltic magmatism. The mineralized ultramafic body is composed predominantly of lherzolite and olivine websterite, with minor dunite, websterite and orthopyroxenite. Here we report new PGE (platinum group element) data and the results of a new, integrated Sr-Nd-Os-S isotope study. The initial concentrations of Rh and Pd in the parental magma are estimated to be 0.014 ppb and 0.24 ppb, respectively, which are more than one order of magnitude lower than those in undepleted mantle-derived magmas such as many continental picrites. The observed PGE depletions in the Xiarihamu parental magma are attributed to sulfide retention in the source mantle, because the degree of partial melting required to generate the Xiarihamu primary magma was not high enough for a magma of that composition to dissolve all sulfides in the source. The (Sr-87/Sr-86) (i) ratios and epsilon(Nd) (t) of the Xiarihamu host rocks range from 0.7062 to 0.7105 and from -1.97 to -5.74, respectively, indicating 5-30 wt% crustal contamination in the Xiarihamu magma. These data also reveal that the source mantle for the Xiarihamu magma is isotopically (Sr-Nd) more enriched than that for the average Cenozoic arc basalt. The gamma Os(t) and delta S-34 values of sulfide ores from the Xiarihamu deposit range from 78 to 1393 and from 2 to 6aEuro degrees, respectively. These values clearly indicate addition of crustal Os and S to the Xiarihamu parental magma. Metal tenors such as Ni and Rh are inversely correlated with gamma Os(t) and delta S-34 values. This indicates that mixing between different pulses of magma with different isotope compositions took place during magma emplacement at Xiarihamu, and that external S played a critical role in the formation of the Xiarihamu magmatic Ni-Cu sulfide deposit.
作者部门: [Zhang, Zhaowei ; Wang, Yalei] Xian Inst Geol & Mineral Resources, MLR Key Lab Magmat Ore Deposits Genet Models & Ex, Xian 710054, Peoples R China ; [Tang, Qingyan] Lanzhou Univ, Sch Earth Sci, Lanzhou 730000, Peoples R China ; [Tang, Qingyan] Lanzhou Univ, Key Lab Mineral Resources Western China Gansu Pro, Lanzhou 730000, Peoples R China ; [Li, Chusi ; Ripley, Edward M.] Indiana Univ, Dept Geol Sci, Bloomington, IN 47405 USA
通讯作者: Tang, QY (reprint author), Lanzhou Univ, Sch Earth Sci, Lanzhou 730000, Peoples R China. ; Tang, QY (reprint author), Lanzhou Univ, Key Lab Mineral Resources Western China Gansu Pro, Lanzhou 730000, Peoples R China.
学科分类: Geochemistry & Geophysics; Mineralogy
文章类型: Article
所属项目编号: Special Fund for Land and Resources Scientific Research of Public Interest [201511020] ; Natural Science Foundation of China [41472070, 41372095, 41302052] ; Fundamental Research Funds for the Central Universities [lzujbky-2015-64]
所属项目名称: 国家自然科学基金项目 ; 公益性行业科研专项 ; 中央高校基本科研业务费专项资金
项目资助者: NSFC ; MOST ; LZU
语种: 英语
DOI: 10.1007/s00126-016-0645-0
ISSN号: 0026-4598
WOS记录号: WOS:000392126400003
IR记录号: WOS:000392126400003
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内容类型: 期刊论文
URI标识: http://ir.lzu.edu.cn/handle/262010/189140
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, ZW,Tang, QY,Li, CS,et al. Sr-Nd-Os-S isotope and PGE geochemistry of the Xiarihamu magmatic sulfide deposit in the Qinghai-Tibet plateau, China[J]. MINERALIUM DEPOSITA,2017,52(1-1):51-68.
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