| 金川铜镍硫化物矿床深熔-就地成矿作用过程研究 |
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| 引用本文：.2003.A Study of Deep Segregation and Ore-forming Process of Jinchuan Nickel-Copper Sulfide Deposit[J].Mineral Deposits,22(3):301~308 |
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| 基金项目:国家重点基础研究发展规划项目“大规模成矿作用与大型矿集区预测”(编号：G1999043211)和国土资源大调查项目“中国超大型铜镍铂岩浆硫化物矿床预测研究”(编号：200110200058) |
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| 中文摘要:文章通过研究矿石冶炼过程中矿物种类、含量、物理化学性质、结晶形态、嵌布特征、颗粒大小和生成环境以及矿物在高温条件下的物理化学反应等，并使之与铜镍硫化物矿床特征对比，认为金川铜镍硫化物矿床深熔_就地成矿作用过程为从深部到侵位的持续熔离。岩浆上侵过程中由于高熔点富镁橄榄石及铬铁矿陆续在岩浆房侧边析出固结，使得岩浆房逐渐变小，硫化物不断富集，最终使得小岩体容大矿。 |
| 中文关键词:地质学 熔离 硅酸盐熔体 铜镍硫化物 冶炼 成矿作用 金川 |
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| A Study of Deep Segregation and Ore-forming Process of Jinchuan Nickel-Copper Sulfide Deposit |
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| Abstract:The structures of the deep segregation orebody in the Jinchuan nickel_copper sulfide deposit are similar to the congealed melt in nickel matte smelting furnace after unexpected power off. From the top to the bottom, Si content decreases in silicate facies，olivine is accumulated in the lower part, and sulfides increase in order of sparsely spotted→sparsely disseminated→densely disseminated→side ronitic→massive forms. A comparison of an orebody with the smelting melt reveal s that the segregation of Jinchuan sulfides_containing magma is not complete. Al l this suggests that the Jinchuan nickel_copper sulfide deposit was formed by a segregation process from depth to emplacement. In the process, the magma chamber became smaller and smaller due to the crystallization of Mg rich olivine and ch romite on the side of the chamber, and thereby sulfides were enriched in the middle part, forming a giant deposit in a small body. |
| keywords:geology, segregation, silicate melt, nickel (copper) sulfide, smelt, metallogenesis, Jinchuan. |
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