Oxygen-fugacity evolution of magmatic Ni-Cu sulfide deposits in East Kunlun: Insights from Cr-spinel composition
文献类型：期刊论文
| 作者 | Jia, Lihui1; Chen, Yi1,2; Su, Bin1; Mao, Qian1; Zhang, Di1 |
| 刊名 | AMERICAN MINERALOGIST
 |
| 出版日期 | 2022-10-26 |
| 卷号 | 107期号:10页码:1968-1981 |
| ISSN号 | 0003-004X |
| 关键词 | Oxygen fugacity Cr-spinel ultramafic rocks Ni-Cu sulfide deposit East Kunlun |
| DOI | 10.2138/am-2022-8050 |
| 英文摘要 | In this study, we use Cr-spinel as an efficient indicator to evaluate the oxygen fugacity evolution of the Xiarihamu Ni-Cu deposit and the Shitoukengde non-mineralized intrusion. Oxygen fugacity is calculated using an olivine-spinel oxybarometer, with spinel Fe3+/sigma Fe ratios determined by a secondary standard calibration method using an electron microprobe. Cr-spinel Fe3+/sigma Fe ratios of the Xiarihamu Ni-Cu deposit vary from 0.32 +/- 0.09 to 0.12 +/- 0.01, corresponding to magma f(O2) values ranging from Delta QFM+2.2 +/- 1.0 to Delta QFM-0.6 +/- 0.2. By contrast, those of the Shitoukengde mafic-ultramafic intrusion increase from 0.07 +/- 0.02 to 0.23 +/- 0.04, corresponding to magma f(O2) varying from Delta QFM-1.3 +/- 0.3 to Delta QFM+1.0 +/- 0.5. A positive correlation between f(O2) and Cr-spinel Fe3+/sigma Fe ratios suggests that the Cr-spinel Fe3+/sigma Fe ratios can be used as an indicator for magma f(O2). The high f(O2) (QFM+2.2) of the harzburgite in the Xiarihamu Ni-Cu deposit suggests that the most primitive magma was characterized by relatively oxidized conditions, and then became reduced during magmatic evolution, causing S saturation and sulfide segregation to form the Xiarihamu Ni-Cu deposit. The evolution trend of the magma f(O2) can be reasonably explained by metasomatism in mantle source by subduction-related fluid and addition of external reduced sulfur from country gneisses (1.08-1.14 wt% S) during crustal processes. Conversely, the primitive magma of the Shitoukengde intrusion was reduced and gradually became oxidized (from QFM-1.3 to QFM+1.0) during crystallization. Fractional crystallization of large amounts of Cr-spinel can reasonably explain the increasing magma f(O2) during magmatic evolution, which would hamper sulfide precipitation in the Shitoukengde intrusion. We propose that the temporal evolution of oxygen fugacity of the mantle-derived magma can be used as one of the indicators for evaluating metallogenic potential of Ni-Cu sulfide deposits and the reduction processes from mantle source to shallow crust play an important role in the genesis of magmatic Ni-Cu sulfide deposits. |
| WOS关键词 | QINGHAI-TIBET PLATEAU ; MAFIC-ULTRAMAFIC INTRUSIONS ; OXIDATION-STATE ; OROGENIC BELT ; CHINA IMPLICATIONS ; FERRIC IRON ; GEOCHEMICAL CONSTRAINTS ; MOSSBAUER-SPECTROSCOPY ; LAYERED INTRUSIONS ; SATURATION SCSS |
| 资助项目 | National Natural Science Foundation of China[41822202] ; National Natural Science Foundation of China[42002096] ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences[11990860] |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| 出版者 | MINERALOGICAL SOC AMER |
| WOS记录号 | WOS:000860851300015 |
| 资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences ; Experimental Technology Innovation Fund of the Institute of Geology and Geophysics, Chinese Academy of Sciences |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/108329]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 通讯作者 | Jia, Lihui; Chen, Yi |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Jia, Lihui,Chen, Yi,Su, Bin,et al. Oxygen-fugacity evolution of magmatic Ni-Cu sulfide deposits in East Kunlun: Insights from Cr-spinel composition[J]. AMERICAN MINERALOGIST,2022,107(10):1968-1981. |
| APA | Jia, Lihui,Chen, Yi,Su, Bin,Mao, Qian,&Zhang, Di.(2022).Oxygen-fugacity evolution of magmatic Ni-Cu sulfide deposits in East Kunlun: Insights from Cr-spinel composition.AMERICAN MINERALOGIST,107(10),1968-1981. |
| MLA | Jia, Lihui,et al."Oxygen-fugacity evolution of magmatic Ni-Cu sulfide deposits in East Kunlun: Insights from Cr-spinel composition".AMERICAN MINERALOGIST 107.10(2022):1968-1981. |
入库方式： OAI收割
来源：地质与地球物理研究所
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