| 西藏甲玛铜多金属矿石榴子石矿物学特征及成因意义 |
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| 引用本文：唐晓倩,王国芝,秦志鹏,姚晓峰,周宇雄.2012.西藏甲玛铜多金属矿石榴子石矿物学特征及成因意义[J].地球学报,33(4):633-640. |
| DOI：10.3975/cagsb.2012.04.23 |
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| 基金项目:国家973项目(编号: 2011CB403103);国土资源地质大调查项目(编号: 1212010012005);中央公益性行业科研专项(编号: 200911007-02) |
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| 中文摘要:甲玛铜多金属矿主要的工业矿体赋存于矽卡岩中, 石榴石矽卡岩是主要的矽卡岩类型, 因此, 研究石榴子石的矿物学特征及其成因具有重要的意义。本文综合前人研究成果, 重点对采于甲玛矿区不同钻孔的、不同空间位置的石榴子石进行了矿石学及电子探针分析研究, 并系统对比其矿物学特征。对18个石榴子石测点和项目组其它电子探针分析成果表明, 甲玛铜多金属矿的石榴子石均为钙质系列, 由贫Ti的钙铁榴石和富Ti、Mg、Mn的钙铝榴石组成。受流体氧逸度的制约, 矿区中心以钙铁榴石为主, 边缘以钙铝榴石为主, 从深部至浅部钙铁榴石含量减少, 钙铝榴石含量增加。此外, 石榴子石“锯齿状”环带成分暗示了其流体过程的多期多阶段性。 |
| 中文关键词:石榴子石 电子探针 成因意义 甲玛铜多金属矿 西藏 |
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| Mineralogical Characteristics and Genesis of Garnet in the Jiama(Gyama) Copper-Polymetallic Deposit of Tibet |
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| Abstract:The ore bodies of the Jiama(Gyama) copper polymetallic deposit are mainly hosted in skarn. Garnet skarn is the main skarn type, and it is therefore significant to study the mineralogical characteristics and genesis of the garnet. Based on previous studies, the authors used electron microprobe to analyze the garnets collected from different depths of drill holes at the mine center and the edge of the Jiama(Gyama) deposit, with a detailed comparative study of mineralogical characteristics. The analytical results of 18 garnet points and other electron microprobe analyses show that all the garnets are of calcium series. They are composed of Ti-poor andradite and Ti-, Mg- and Mn-rich grossular. Constrained by the fluid oxygen fugacity, garnets at the mining center are mainly composed of andradite, while those on the edge of the mining area are composed of grossular. The content of the andradite decreases from the depth to the shallow part, whereas the grossular content increases. In addition, the zigzag zonation composition of the garnet indicates that the fluid process had multi-phase and multi-stage characteristics. |
| keywords:garnet electron microprobe analysis genetic significance Jiama(Gyama) copper polymetallic deposit Tibet |
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