| 江西九瑞地区两种岩浆侵位类型及其成矿特征 |
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| 引用本文：.1998.Type of magmatic emplacement in relation to mineralization Jiujiang-Ruichang district, Jiangxi Province[J].Mineral Deposits,17(1):36~46 |
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| 基金项目:国家攻关项目（85-901-03-09） |
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| 中文摘要:通过对江西九江-瑞昌地区岩浆侵位的研究，将该区燕山早期“小岩体”划分为顶蚀侵能与贯入侵能两种类型。并阐述了与这两种类型岩体有关的成矿类型分别为接触交代矽卡岩型和中低温岩浆热液型，它们不但在矿化性质与矿化程度上有明显差别，而且在空间上亦各呈不同格式分布。因此，对该区“小岩体”应作具体分析，而其岩浆侵位类型将对矿化起直接控制作用。 |
| 中文关键词:岩浆侵位类型 顶蚀侵位 贯入侵位 成矿作用 九瑞地区 |
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| Type of magmatic emplacement in relation to mineralization Jiujiang-Ruichang district, Jiangxi Province |
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| Abstract:In Jiujiang-Ruichang district of Jiangxi Province there exist more than one hundred Early Yanshanisn small intrusive bodies, each smaller than 0.5 km2 in area. According to studies of these rock bodies in such aspects as their shapes , internal structures, contact relationships and petrochemical composition, the author has classified these rock bodies into deroofing emplacement type and injection emplacement type, and pointed out the existence of two metallogenic types related respectively to these two types of emplaced rock bodies: ore deposits related to rock bodies of deroofing emplacement seem to be contact metasomatic skarn deposits, whereas those related to rock bodies of injection emplacement are mesothermal-epithermal deposits. These two sorts of deposits exhibit obvious differences in occurrence position, material composition, fluid inclusion, stable isotope and mineralization dimensions. In addition, as rock bodies of deroofing emplacement arc controlled by intersecting and compounding positions of NW-trending faults and NE-NEE trending faults, and rock bodies of injection emplacement are controlled by NE-NEE trending large-sized strike faults along bedding planes (lithologic difference planes or parallel unconformity planes) , ore deposits related to these two sorts of rock bodies also exhibit corresponding regular distribution. Therefore, small rock bodies in Jiujiang-Ruichang district should be analysed individually, and their emplacement types ought to be determined. Only in this way can prospecting and evaluation of orc deposit be correctly done. |
| keywords:type of magmatic emplacement, deroofing emplacement, injection emplacement, mineralization, Jiujiang-Ruichang district |
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