| 四川米易海塔地区混合岩型铀矿流体包裹体特征 |
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| 引用本文： | 郭锐,陈友良,刘凯鹏,郑玉文,胡漾.四川米易海塔地区混合岩型铀矿流体包裹体特征[J].矿物学报,2020,40(2):137-148. |
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| 作者姓名： | 郭锐 陈友良 刘凯鹏 郑玉文 胡漾 |
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| 作者单位： | 成都理工大学地球科学学院,四川成都610059;成都理工大学地球科学学院,四川成都610059;成都理工大学地学与核技术四川省重点实验室,四川成都610059;核工业203研究所,陕西咸阳712000 |
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| 基金项目： | 中国核工业地质局科研项目;国家自然科学基金 |
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| 摘 要： | 混合岩型铀矿是康滇地轴上最有希望取得找矿突破的铀矿类型,海塔地区的铀矿化即是该类型铀矿的典型代表。本文针对区内的长英质脉矿石、富晶质铀矿石英脉矿石和含矿热液石英脉中的石英流体包裹体进行了研究。结果表明,海塔地区混合岩型铀矿的成矿作用可分为2个阶段:早期混合岩化热液成矿阶段为高温、中低盐度流体,流体包裹体均一温度集中在380~540℃,盐度变化范围为16.15%~23.18%NaCl eqv,是区内铀成矿的主要阶段;晚期热液叠加改造成矿阶段为中低温、低盐度流体,流体包裹体均一温度集中在140~220℃,盐度变化范围为5.56%~23.18%NaCleqv,是区内富铀矿的形成阶段。流体包裹体的气相成分测试表明,长英质脉矿石石英包裹体中以CH4、CO2为主,其次为H2O和N2;而富晶质铀矿石英脉及含矿热液石英脉石英包裹体中以H2为主,部分含有CO2、CH4、H2O。氢、氧同位素研究表明,早期混合岩化成矿阶段的成矿流体可能为岩浆水与变质水的混合,而晚期热液叠加改造成矿阶段成矿流体中可能有大气降水的加入。
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| 关 键 词： | 流体包裹体 显微测温 激光拉曼光谱分析 氢氧同位素 混合岩型铀矿 海塔地区 |
Characteristics of Fluid inclusions in quartz of the Haita migmatite type uranium deposit in Miyi County,Sichuan Province,China |
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| GUO Rui,CHEN You-liang,LIU Kai-peng,ZHENG Yu-wen,HU Yang.Characteristics of Fluid inclusions in quartz of the Haita migmatite type uranium deposit in Miyi County,Sichuan Province,China[J].Acta Mineralogica Sinica,2020,40(2):137-148. |
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| Authors: | GUO Rui CHEN You-liang LIU Kai-peng ZHENG Yu-wen HU Yang |
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| Institution: | (College of Geosciences,Chengdu University of Technology,Chengdu 610059,China;Key Laboratory of Nuclear Techniques in Geosciences,Chengdu University of Technology,Chengdu 610059,China;No.203 Research Institute of Nuclear Industry,Xianyang 712000,China) |
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| Abstract: | Migmatite type uranium deposit is the most promising type for the exploration of uranium resources in the Kangdian Axis.The uranium mineralization in the Haita area is a typical representative of this type of uranium deposit.In this paper,fluid inclusions of the quartz in quartz-feldspar vein ores,uraninite-bearing quartz veins,and ore-bearing hydrothermal quartz veins in the Haita deposit have been studied.The results show that there are two stages of uranium mineralization of the migmatite type uranium deposit in the Haita area.The hydrothermal fluid of early ore-forming stage,sourced from the migmatization,is characterized with high temperature and medium-low salinity,with homogenization temperatures of fluid inclusions ranging mainly from 380℃to 540℃,and salinities varying mainly from 16.15%to 23.18%NaCl eqv.The early ore-forming stage is the main stage of uranium mineralization in the area.The hydrothermal fluid of the late ore-forming stage,which is a superimposed transformation metallogenic stage,is characterized with medium-low temperature and low salinity,with homogenization temperatures of fluid inclusions ranging mainly from 140℃to 220℃and salinities varying mainly from 5.56%to 23.18%NaCl eqv.This late ore-forming stage is the formation stage of high grade uranium orebodies in the area.The analysis of gas phase compositions of fluid inclusions show that fluid inclusions of the quartz in quartz-feldspar veins contain dominated CH4 and CO2,and minor H2O and N2.Fluid inclusions of the quartz in uraninite-bearing quartz veins and ore-bearing hydrothermal quartz veins contain dominant H2 and partly minor CO2,CH4 and H2O.The hydrogen and oxygen isotopes show that the ore-forming fluid of the early migmatization metallogenic stage may be the mixture of magmatic water and metamorphic water,while that of the late hydrothermal superimposed transformation stage could contain a certain amount of meteoric water. |
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| Keywords: | fluid inclusion microtermometry laser Raman spectroscopy hydrogen and oxygen isotopes migmatite type uranium deposit the Haita area |
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