| 西藏甲玛铜多金属矿床角岩岩石类型、成因意义及隐伏斑岩岩体定位预测 |
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| 引用本文： | 王崴平,唐菊兴.西藏甲玛铜多金属矿床角岩岩石类型、成因意义及隐伏斑岩岩体定位预测[J].矿床地质,2011,30(6):1017-1038. |
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| 作者姓名： | 王崴平 唐菊兴 |
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| 作者单位： | 1. 中国地质科学院研究生部,北京,100037
2. 中国地质科学院矿产资源研究所国土资源部成矿作用与资源评价重点实验室,北京,100037 |
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| 基金项目： | 本文得到危机矿山接替资源找矿专项典型矿床及成矿规律总结研究项目（编号：20089932）、国家973项目(编号：2011CB403103)、青藏专项（编号：1212010012005）共同资助 |
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| 摘 要： | 甲玛铜多金属矿床中发育角岩,按角岩与成矿的关系,可将其划分为成矿前角岩与成矿期角岩,多属钠长绿帘角岩相,矿物共生组合主要为钠长石+黑云母+石英.成矿前角岩以细晶化为主要特征,大多斑晶矿物没有独立晶形,其岩性主要为原生黑云母角岩(具典型斑点状、条带状构造)、长英质角岩；成矿期角岩的热液斑晶矿物具独立晶形,其岩性主要为硅化...
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| 关 键 词： | 地质学 角岩 成矿前角岩 成矿期角岩 热变质 隐伏斑岩岩体 矿床模型 斑岩成矿系统 演化 甲玛 |
Rock types and genetic significance of hornfels and location prediction of concealed porphyry bodies in Jiama copper polymetallic deposit, Tibet |
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| WANG WeiPing
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TANG JuXing.Rock types and genetic significance of hornfels and location prediction of concealed porphyry bodies in Jiama copper polymetallic deposit, Tibet[J].Mineral Deposits,2011,30(6):1017-1038. |
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| Authors: | WANG WeiPing TANG JuXing |
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| Institution: | WANG WeiPing1 and TANG JuXing2(1 Graduate School of Chinese Academy of Geological Sciences,Beijing 100037,China,2 MLR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,China) |
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| Abstract: | The hornfels thermal metamorphism is well developed in the Jiama copper polymetallic deposit. Rock types of hornfels can be divided into the pre-oreforming stage hornfels and the syn-oreforming ones, belonging to AEH facies with the main mineral association being albite+biotite+quartz. The pre-orefoming hornfels consists of protogenic biotite hornfels with typical mottled and banded structures, and felsic hornfels characterized by refined grains, with most phenocryst minerals having no independent morphology. The syn-oreforming hornfels silicified hornfels and hydrothermal biotite-chlorite hornfels, with phenocryst minerals possessing good crystal habit. Based on stratigraphic contact relationship and rock fabrics, the authors infer that the protoliths of hornfels were sandy slates and carbonaceous slates, evidenced by comparative study of petrochemical and geochemical features. Considering that hornfels is a natural tracer material for thermal metamorphism, the authors contoured the thickness of hornfels and related mineralization and located the concentration centers of Cu and Mo, which helps indicate the location of the concealed porphyry body with the help of the latest exploration results. The authors built a model for the Jiama copper polymetallic deposit, which indicates the sequence of mineralization in the ore deposit and comparatively explains the roles of the thermal metamorphism and hydrothermal alteration in hornfels type mineralization. |
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| Keywords: | geology hornfels pre-oreforming hornfels syn-oreforming hornfels thermal metamorphism concealed porphyry deposit model porphyry metallogenic system evolution Jiama |
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