| 西准噶尔白杨河铀矿床沥青铀矿矿物特征及形成环境 |
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| 引用本文： | 陈光旭,李光来,刘晓东,李成祥,刘朕语,王果,韩振,刘小波.西准噶尔白杨河铀矿床沥青铀矿矿物特征及形成环境[J].地质学报,2019,93(4):865-878. |
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| 作者姓名： | 陈光旭 李光来 刘晓东 李成祥 刘朕语 王果 韩振 刘小波 |
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| 作者单位： | 东华理工大学核资源与环境国家重点实验室;安徽省核工业勘查技术总院;核工业二一六大队 |
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| 基金项目： | 本文为国防科工委项目“西北古生代铀成矿作用”(No. 2110400024)、国家自然科学基金项目(No. 41302053；No. 41272101)、江西省研究生创新项目(No. YC2016- S291)联合资助的成果。 |
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| 摘 要： | 白杨河铀矿是我国新疆地区典型的铀-多金属矿床,为查明该矿原生铀矿物特征,进一步探究沥青铀矿的形成与保存环境,本文利用偏光显微镜、扫描电镜、电子探针等多种研究手段对该矿床中的沥青铀矿开展了矿物学研究工作,并利用激光拉曼和碳硫仪对与原生矿体空间关系极为密切的黑色断层泥开展了研究。结果表明,本矿床形成的原生沥青铀矿主要赋存在热液脉中,矿石组构包括:碎裂结构、花岗状压碎结构、斑状压碎结构、交代反应边结构;黑色断层泥含有一定量的有机碳(TOC为0.24%～1.07%),拉曼测试结果显示出较强烈的碳质峰。沥青铀矿不同程度地遭受流体改造作用,使得矿物化学成分极其复杂。随着流体改造程度的增加,UO_2、PbO呈现降低的趋势,Nb_2O_5及ZrO_2含量则表现出升高的趋势,显示在后期的流体改造作用过程中,铀被活化迁移的同时,流体还带来了丰富的Nb和Zr等元素。进一步分析认为富有机碳的断层泥在成矿过程中可能为U~(6+)的易溶络合物还原为沥青铀矿沉淀提供了有利条件,并且在沥青铀矿形成后起到了一定程度的保护作用。
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| 关 键 词： | 白杨河铀矿 沥青铀矿 后生改造作用 含碳断层泥 西准噶尔 |
| 收稿时间： | 2018/4/11 0:00:00 |
| 修稿时间： | 2018/8/31 0:00:00 |
Mineralogical characteristics and formation environment of pitchblende in the Baiyanghe uranium deposit in west Junggar |
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| Chen Guangxu,Li Guanglai,Liu Xiaodong,Li Chengxiang,Liu Zhenyu,Wang Guo,Han Zhen and Liu Xiaobo.Mineralogical characteristics and formation environment of pitchblende in the Baiyanghe uranium deposit in west Junggar[J].Acta Geologica Sinica,2019,93(4):865-878. |
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| Authors: | Chen Guangxu Li Guanglai Liu Xiaodong Li Chengxiang Liu Zhenyu Wang Guo Han Zhen and Liu Xiaobo |
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| Abstract: | Baiyanghe uranium deposit is a typical uranium- polymetallic deposit in Xinjiang. In order to find out the mineralogical characteristics of primary uranium minerals and to investigate the forming environment and preservation of pitchblende in detail, this paper carried out mineralogical analysis on pitchblende by utilizing polarizing microscope, scanning electron microscope (SEM), electron probe (EPMA) and other methods, and study of the black fault gouge spatially related to the primary uranium orebodies using Laser Raman spectrometer and carbon- sulphur detector. The results show that the primary pitchblende mainly occurs in the hydrothermal veins with main ore fabrics of cataclastic, granitic crushing, porphyroclastic, and metasomatic reaction rim textures. The chemical compositions of pitchblende are very complicated as pitchblende underwent varying degrees of transformation by fluids. With fluid transformation increasing, the contents of UO2 and PbO decrease and Nb2O5 and ZrO2 increase, indicating that the uranium was mobilized and migrated during the transformation processes and Nb and Zr elements were brought in by fluids. Further investigation shows that the carbon- bearing fault gouge may provide favorable conditions for the precipitation of pitchblende from reduction of soluble U6+ complex, and also play a protective role in the preservation of pitchblende. |
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| Keywords: | Baiyanghe uranium deposit Pitchblende Retroactive transformation Carbon- bearing fault gouge Western Junggar |
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