| 一七九岩体接触带铀成矿特征 |
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| 引用本文：.1990.Characteristics of uranium mineralization along the cont act zone of no．179 intrusive body[J].Mineral Deposits,9(1):56~62 |
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| 中文摘要:一七九岩体接触带产有铀矿床。该矿床矿石组合为沥青铀旷一金属硫化物一方解石。赋矿岩石为晚元古代浅变质岩、晚古生代碳硅泥岩及印支期花岗岩等围岩中的碎裂岩。该矿体既具花岗岩型铀矿的一般特征（如受岩体和断裂构造控制，与该岩体内的微晶石英型铀矿床，有着密切的时空和成因联系），也有自身的某些特点（如沥青铀矿主要沉淀于碳酸盐热液期，在成因上具多源性和复成性，属混合热液型）；在成矿地质背景方面，具铀源条件较差、碳酸岩与水云母化发育等重要特色。矿床属花岗岩型铀旷中的一个特殊类型。 |
| 中文关键词:一七九岩体接触带 碳酸盐型铀矿床 成矿特征 复成热液成矿 钙沉淀期 |
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| Characteristics of uranium mineralization along the cont act zone of no．179 intrusive body |
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| Abstract:The No. 179 rock body is an Indo-Sinian complex granite body. Along its contact zone occurs a carbonate type uranium doposit which has the characteristic association of pitchblende-metallic sulfides-calcite. Pitchblende-calciteveins occur in cataclasite zones within such wall rocks as Iate Proterozoic epimetamorphic rocks, late Paleozoic carbonaceous siliceous mudstone and Indosinian granite.Uranium mineralization in this ore deposit is mainly controlled by granite body and fracture structures; uraItium mineralization is chiefly in the form of colloidal filling and possesses obvious poly-stage characters; the rock-forming temperatures are 130-200℃, belonging to mesothermal-epithermal type; uranium mineralization age is 60Ma, indicating a rather great time difference between the ore and the rock; this ore deposit has a quite close temporal-spatial and genetic connection with the microcrystalline quartz type uranium deposit in the granite body. All these phenomena suggest that this ore deposit possesses the common characteristics of the granite type uranium deposits. The ore deposit also shows lots of its own features: the apparent difierence in sulfur, oxygen and carbon isotope determinations betweew mineralization veins of the two stages suggests that their ore-forming substances came from the depth and tile near-surface places respectivdy; uranium was extracted uninterruptedly through different means from different soIid rocks with dffferent depths; uranium mineralization belongs to acid siliceous stage and carbonate hydrothermal stage(corresponding to calcium deposition stage of granite type uranium deposits); the ore deposit is genetically of mixed hydrothermal type and is fundamentally different from the microcrystalline quartz type uranium deposit. This ore deposit, therefore, is of a special type in granite type uranium deposits. |
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