| 西准噶尔白杨河铍铀矿床中铍与铀成生关系初探——来自围岩蚀变和矿石矿物接触关系的证据 |
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| 引用本文： | 刘,畅.西准噶尔白杨河铍铀矿床中铍与铀成生关系初探——来自围岩蚀变和矿石矿物接触关系的证据[J].地质与勘探,2020,56(3):465-477. |
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| 作者姓名： | 刘 畅 |
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| 作者单位： | 铀资源勘查与评价技术重点实验室，核工业北京地质研究院，北京； 核工业216大队，新疆乌鲁木齐； 中国地质大学（北京）地球科学与资源学院，北京 |
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| 基金项目： | 中国核工业集团“龙腾2020”科技创新计划项目（编号:LTD1603）资助 |
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| 摘 要： | 与高硅富氟火成岩(流纹岩或花岗斑岩)有关的铍矿床中常伴有铀矿化,其成矿特色明显,是认识岩浆-岩浆热液-热液演化过程中铍与铀地球化学行为异同的理想对象,但其中铍与铀成矿的时空关系及成因关系尚不清楚。为了理解该类矿床中铍与铀的成生关系,并为区域内铍与铀的找矿勘查提供理论支撑,本文选取该类矿床的典型代表—西准噶尔白杨河铍铀矿床为研究对象,通过镜下观察、扫描电镜能谱和激光拉曼光谱分析,对矿区内单铍矿石、单铀矿石和铍铀矿石开展了系统的岩相和矿相学研究。结果显示,与铍矿化相关的围岩蚀变为钠长石化、电气石化、白云母化、萤石化、碳酸盐化和绿泥石化,与铀矿化相关的围岩蚀变为硅化、赤铁矿化、萤石化、伊利石化和锰矿化(含少量铅),且铍铀矿石中可见沥青铀矿切穿羟硅铍石的现象。结合铍与铀的地球化学行为和前人研究成果,认为白杨河铍铀矿床中铍矿化与铀矿化应是不同期热液作用的结果:铍矿化可能是花岗斑岩深部岩浆房分异的岩浆热液在不断演化过程中形成的,而铀矿化可能与后期流体(如幔源流体、加热循环的大气降水等)的淋滤作用有关。
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| 关 键 词： | 围岩蚀变 矿石矿物接触关系 铍与铀成生关系 白杨河矿床 西准噶尔 |
| 收稿时间： | 2019/9/7 0:00:00 |
| 修稿时间： | 2020/2/10 0:00:00 |
Relationship between the beryllium and uranium mineralization in the Baiyanghe Be-U deposit, western Junggar: Evidence from wall-rock alteration and contact relation of ore and minerals |
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| Liu Chang.Relationship between the beryllium and uranium mineralization in the Baiyanghe Be-U deposit, western Junggar: Evidence from wall-rock alteration and contact relation of ore and minerals[J].Geology and Prospecting,2020,56(3):465-477. |
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| Authors: | Liu Chang |
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| Institution: | (1. Key Laboratory of Uranium Resources Exploration and Evaluation Techniques, Beijing Research Institute of Uranium Geology, Beijing 100029; 2. Geologic Party No.216, Urumqi, Xinjiang 830011;3. School of Earth Sciences and Resources, China University of Geosciences (Beijing) , Beijing 100083) |
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| Abstract: | The Be deposits related to high-silica, fluorine-rich igneous rocks (rhyolite, granite porphyry) are commonly accompanied by U mineralization, and a distinctive and ideal object to understand the similarities and differences of geochemical behavior between Be and U during the magmatic-magmatic hydrothermal-hydrothermal evolution. However, the temporal-spatial and genetic relationships between Be and U mineralization remain unclear. To address this issue, this work selects the Baiyanghe Be deposit in western Jungar as an object, carries out the systematic studies of petrography and mineralogy on Be ores, U ores and Be-U ores by microscopic observation, scanning electron microscopy -X-ray energy dispersive and Laser Raman spectroscopy analysis. Results show that the wall-rock alteration related to the Be mineralization includes albitization, tourmalinization, muscovitization, fluoritization, carbonatization and chloritization, whereas that related to the U mineralization includes silicification, hematitization, fluoritization, illitization and Mn (Pb) oxides, and the the pitchblende crosscutting bertrandite is observed in Be-U ores. Combining with the geochemical behaviors of beryllium and uranium, and previous relevant studies, it is suggested that the Be and U mineralization in the Baiyanghe deposit might result from different mineralization events. The Be mineralization formed probably in the evolution process of magmatic fluid derived from the magma of granite porphyry, and the U mineralization may be associated with the later leaching process of fluids (such as mantle-derived fluids or meteoric waters). |
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| Keywords: | wall-rock alteration contact relation of ore minerals relationship between Be and U mineralization Baiyanghe deposit western Junggar |
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