| 相山铀矿田成矿作用的地球化学模拟 |
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| 引用本文： | 周文斌,史维浚.相山铀矿田成矿作用的地球化学模拟[J].地球化学,1997,26(5):62-70. |
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| 作者姓名： | 周文斌 史维浚 |
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| 作者单位： | 华东地质学院!江西临川，344000，华东地质学院!江西临川，344000，华东地质学院!江西临川，344000 |
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| 摘 要： | 相山铀矿田是我国最大的火山岩型热液铀矿田，在地质地球化学和高温高压实研究的基础上，利用地球化学模式程序ＥＱ３／６模拟了成矿热水溶液的形成过程和减压排泄区铀成矿作用。计算机模拟结果表明，通过大气降水与碎斑熔岩相互作用，可以形成富含Ｆ和ＳｉＯ２等矿化剂的含铀热水溶液；由于铀以ＵＯ２Ｆ＾３和ＵＯ２（ＣＯ３（＾２－３等配合形式存在，非常稳定，即使在深部强还原环境中仍能能够迁移；酸性和碱性环境，尤其是强酸性
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| 关 键 词： | 成矿作用 地球化学模拟 铀矿田 |
GEOCHEMICAL MODELING OF MINERALIZATION PROCESSES FOR XIANGSHAN URANIUM ORE-FIELD |
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| Zhou Wenbin, Shi Wei, jun Lu, Yuejin.GEOCHEMICAL MODELING OF MINERALIZATION PROCESSES FOR XIANGSHAN URANIUM ORE-FIELD[J].Geochimica,1997,26(5):62-70. |
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| Authors: | Zhou Wenbin Shi Wei jun Lu Yuejin |
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| Abstract: | Xiangshan uranium ore-field is the largest volcanic rock type hydrothermal uranium deposit in China. Based on the study of geology, geochewistry and experiments athigh pressures and temperatures, the authors have modeled the formation of ore-forminghydrothermal solution and the mineraization in discharge zones of Xiangshan fossilhydrothermal system using EQ3 / 6. The modeling shows tha F and CO2-richeduranium-bearing hydrothermal fluids could be generated by means of the intefactionbetween local meteoric water and porphyro-clastic lava, UO2F3, UO2(CO3)2 andother uranium complexes could be very stable even in strong reducing enviommenturanium tending to be more mobile with the increase of F CO2 and temperature, indischarge zones of hydrothermal systems, uranium could be precipitated by temperaturedropping, degassing and mixing, forming the mineara assemblage of uraninite,thorianite, fluorite, calcite and hematite, which is in accordance with thefluorite-hydromica type of Uranium deposit. Therefore, geochemical medeling codes areeffective meassures to approch the geochemical processes in hydrothermal system,which can be used not only for modeling of geochemical processes under naturaconditions, but also for exploring the reaction path and dynamics of geochemicalprocesses. |
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| Keywords: | mineralization process geochemical modeling Uranium ore-field |
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