| 金川超大型铜镍硫化物矿床的铂族元素地球化学特征 |
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| 引用本文： | 王瑞廷,毛景文,赫英,王东生,汤中立.金川超大型铜镍硫化物矿床的铂族元素地球化学特征[J].大地构造与成矿学,2004,28(3):279-286. |
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| 作者姓名： | 王瑞廷 毛景文 赫英 王东生 汤中立 |
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| 作者单位： | 中国地质大学地球科学与资源学院,北京,100083;西北有色地质勘查局,陕西,西安,710054;中国地质大学地球科学与资源学院,北京,100083;中国地质科学院矿产资源研究所,北京,100037;西北大学地质系,陕西,西安,710054;西北有色地质勘查局,陕西,西安,710054;长安大学地球科学与资源学院,陕西,西安,710054 |
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| 基金项目： | 国家重大基础研究发展规划项目 (编号 :19990 43 2 11) |
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| 摘 要： | 对金川超大型铜镍岩浆硫化物矿床岩石、矿石的铂族元素地球化学特征研究表明 ,金川岩体的平均Cu/Pd值远大于原生地幔岩浆的Cu/Pd值 ,说明其岩石为因硫化物析离而失去Pd的岩浆所结晶 ;且岩石的PGE具有部分熔融趋势 ,与地幔橄榄岩接近 ,这些均指示存在岩浆熔离作用。该矿床岩石、矿石的PGE球粒陨石标准化分布模式比较对应 ,均可分为两种类型 ,反映了岩浆多次侵入、熔离分异同时成岩成矿的特征。另外 ,PGE S关系分析表明其成岩成矿过程中有少量地壳物质混染。PGE地球化学特征参数还指示了其高镁拉斑玄武质母岩浆的性质。
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| 关 键 词： | 铂族元素 铜镍硫化物矿床 地球化学特征 金川 |
| 文章编号： | 1001-1552(2004)03-0279-08 |
| 修稿时间： | 2003年8月26日 |
GEOCHEMICAL CHARACTERISTICS OF PLATINUM GROUP ELEMENTS IN JINCHUAN SUPER-LARGE SULFIDE COPPER-NICKEL DEPOSIT, JINCHANG CITY, GANSU PROVINCE, CHINA |
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| WANG Ruiting.GEOCHEMICAL CHARACTERISTICS OF PLATINUM GROUP ELEMENTS IN JINCHUAN SUPER-LARGE SULFIDE COPPER-NICKEL DEPOSIT, JINCHANG CITY, GANSU PROVINCE, CHINA[J].Geotectonica et Metallogenia,2004,28(3):279-286. |
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| Authors: | WANG Ruiting |
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| Institution: | WANG Ruiting~ |
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| Abstract: | The Platinum-group element geochemistry of rocks and ores from Jinchuan super-large copper-nickel sulfide deposit is systematically studied. The Cu/Pd mean ratio of Jinchuan intrusion is lower than that of original mantle magma, which indicates that these ultrabasic rocks were crystallized from magma that lost Pd in the form of melting segregation of sulfides. The PGE of the rocks show trend of partial melting, similar to that of mantle peridotite, which shows that magma liquation exists during rock-forming and ore-forming process. The chondrite normalized PGE patterns of the rocks and ores are well related to each other, which signifies the signatures of multi-episode magmatic intrusion, melting and differentiation in the formation processes of rocks and ores. In addition, analyses about the relation between PGE and S, and study on Re-Os isotopes indicate that few contamination of the crustal substances occurred during the magmatic intrusion and the formation of deposit. However, contamination by crustal substances helps to supply part of the S for the enrichment of PGE. Meanwhile, the hydrothermal process is also advantageous for the enrichment of PGE, especially for Pt and Pd, due to deep melting segregation. The charcteristic parameters (such as Pt/(Pt+Pd), (Pt+Pd)/(Ru+Ir+Os), Pd/Ir, Cu/(Ni+Cu), and so on.) for platinum-group elements for Jinchuan sulfide copper-nickel deposit show the same features as those for sulfide copper-nickel deposit related to basic magma, which also illustrates its original magma property representative of Mg-high tholeiite. Therefore,it is the mafic (not ultramafic) magma that results in the formation of the superlarge sulfide copper-nickel deposit enriched in Cu and PGE. To sum up, the geochemical charcteristics of platinum-group elements in rocks and ores from Jinchuan copper-nickel sulfide deposit are constrained by the continental rift tectonic environment, the parent magma features, the enriched mantle magma source, the complex metallogenesis and PGE geochemical signatures, and this would be rather significant for the study about the genetic mechanism of copper-nickel sulfide deposit. |
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| Keywords: | platinum group elements copper-nickel sulfide deposit geochemical feature Jinchuan |
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