| 云南会泽超大型铅锌矿床构造带方解石稀土元素地球化学 |
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| 引用本文：.2003.REE Geochemistry of Calcites from Fault Zone of Huize Superlarge Pb-Zn Deposit s in Yunnan Province[J].Mineral Deposits,22(2):199~207 |
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| 基金项目:自然科学基金项目(40172038)和云南省省院省校科技合作项目(2000YK_04) |
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| 中文摘要:云南会泽超大型铅锌矿床明显受北东向构造带控制，构造带中的脉状 方解石为富碳酸盐流体活动的产物。文章通过对这种脉状方解石的稀土元素地球化学研究， 探讨构造流体的来源及其与成矿流体的关系。结果显示，矿区北东向构造带中脉状方解石的 稀土含量范围较宽(∑REE：5.471×10-6～56.788×10-6)、稀土配分模式为相 似的轻稀土富集型、存在较强的铕负异常(δEu：0.439～0.742)。结合地层、矿石中脉石矿 物方解石、峨眉山玄武岩的稀土元素含量和碳、氧同位素组成，认为控矿构造带中方解石稀 土为同源构造流体的结晶产物，构造流体稀土元素地球化学特征明显受成矿流体的控制。 |
| 中文关键词:地球化学 构造带方解石 稀土元素 会泽铅锌矿床 |
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| REE Geochemistry of Calcites from Fault Zone of Huize Superlarge Pb-Zn Deposit s in Yunnan Province |
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| Abstract:The orebodies of the Huize superlarge Pb-Zn deposit in Yunnan Province are contr olled obviously by the NE-trending fault zone. The vein calcites in this fault z one are precipitated from carbonate-rich fluids. Based on a study of the REE geo chemical features of vein calcites, the authors have dealt with in this paper th e source of the fluids in the fault zone and its relationship with the ore-formi ng fluids. It is shown that the REE content of vein calcite in NE-trending fault zone ranges from 5.471×10-6 to 56.778×10-6, that the REE patterns are similar (LREE-rich), and that the Eu anomaly is rather strong (δEu being 0 .439～0.742). According to REE geochemistry, carbon and oxygen isotopes data of the strata, the gangue mineral (calcites) and the Emeishan basalts, the authors hold that the wide range of the REE content of vein calcite in the NE-trending fault zone results from REE reduction during the migration of fluids in the faul t zone, that REE geochemistry of fluid in the fault zone is controlled obviously by the ore-forming fluid, and that fluids in the NE-trending fault zone (and or e-forming fluids) have close relations with the strata and the magmatic activity of the Emeishan basalts. |
| keywords:geochemistry, calcites in fault zone, REE geochemistry, Huize Pb-Zn deposits |
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