| 金川铜镍硫化物矿床两类矿石的稀土元素地球化学特征研究 |
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| 引用本文：赵振华,钱汉东.2008.Geochemical REE study of two kinds of ores in Jinchuan copper_nickel sulfide deposit[J].Mineral Deposits,27(5):613~621 |
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| 基金项目:国家自然科学基金项目(No.40272025) |
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| 中文摘要:文章对金川铜镍硫化物矿床的网状富矿石和星点状贫矿石的稀土元素地球化学特征进行了研究，结果表明：网状富矿石的稀土元素含量低于星点状矿石，这可能与矿石中硫化物及橄榄石含量有关；网状富矿石的δEu差别大，结合矿石显微照片的结构特征，说明其岩浆演化环境比较复杂，应该处于缓慢冷凝的早期深部熔离成矿作用阶段；而星点状矿石样品的稀土元素标准化分布曲线相似，结合矿石显微照片的结构特征，指示其应该形成于快速冷凝的晚期就地熔离成矿作用。此外，两者的轻、重稀土元素分馏程度相当，这否定了贫矿岩浆与富矿岩浆之间的演化关系，揭示了原始岩浆分层后，各层岩浆是独立演化并成矿的。 |
| 中文关键词:地球化学 金川铜镍硫化物矿床 Q型聚类分析 稀土元素 深部熔离作用 就地熔离作用 |
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| Geochemical REE study of two kinds of ores in Jinchuan copper_nickel sulfide deposit |
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| Abstract:In this paper, the REE content of the network rich ores and the star_like lean ores in the Jinchuan copper_nickel sulfide ore_deposit was studied. The results show that the REE content in the network rich ores is lower than that of the star_like lean ores, which may be attributed to the content of sulfide and olivine. δEu values of the network rich ores vary remarkably. Combined with the micrographs of ores, it is held that network rich ores were formed in a complex environment during the process of early deep liquation. The star_like lean ores have similar chondrite_normalized REE patterns. Combined with the micrographs of ores, it is considered that the star_like lean ores were formed in the process of late in_situ liquation. In addition, the degrees of REE fractionation of the two types of ores are similar to each other, which refutes the view of evolutionary relationship between the poor sulfide magma and rich sulfide magma and also indicates that after the stratification of primary magma, the evolution and metallogenic process of magma of each layer are independent. |
| keywords:geochemistry, Jinchuan copper_nickel sulfide deposit, Qcluster analysis, REE, deep liquation, in_situ liquation |
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