盛夏,张达,阙朝阳,毕珉峰,狄永军,祖世元,马慧慧

• 1:中国地质大学(北京)地球科学与资源学院
• 2:安徽农业大学
• 3:紫金矿业集团股份有限公司
• 4:文山麻栗坡紫金钨业集团有限公司

摘要(Abstract)：

洒西钨铍矿床位于滇东南老君山钨锡多金属成矿区。确定早期似层状矿体和晚期脉状矿体的流体性质、来源和演化过程，并对其流体地球化学和同位素进行约束，可以有效探讨洒西钨铍矿床成矿机制，为老君山矿集区下一步找矿工作提供理论思考。洒西钨铍矿床脉状矿体的形成经历了硅酸盐阶段、氧化物-硫化物阶段和碳酸盐-萤石阶段，白钨矿和绿柱石主要形成于前两阶段。对洒西钨铍矿床脉状矿体不同阶段石英中的流体包裹体进行了岩相学特征、显微测温、激光拉曼光谱分析等研究，并对早期似层状矿体和晚期脉状矿体矿石中石英的氢-氧同位素组成进行了测试。结果表明：该矿床内脉状矿体的流体包裹体主要有富液相包裹体、富气相包裹体和含子矿物多相包裹体3种类型。流体包裹体的气相成分以H_2O主，含少量还原性气体如C_2H_2等，液相成分也以H_2O为主。从硅酸盐阶段到碳酸盐-萤石阶段，包裹体的均一温度和盐度(NaCl_(eq))峰值范围分别为240～360℃、2.35%～13.81%;220～310℃、4.03%～9.86%和190～270℃、2.41%～6.88%。从硅酸盐阶段到碳酸盐-萤石阶段，成矿流体的温度呈现降低趋势，盐度也呈降低趋势。成矿流体总体上属中-高温度、低盐度、贫CO_2、含部分还原性气体的NaCl-H_2O流体体系。早期似层状矿体石英样品δD_(V-SMOW)值变化范围小，为-102.8‰～-99.0‰,δ~(18)O_(V-SMOW)值为11.7‰～13.0‰,δ~(18)O_(H_2O)值为3.16‰～6.46‰;晚期脉状矿体氧化物-硫化物阶段石英样品δD_(V-SMOW)值变化范围较大，为-99.6‰～-69.5‰,δ~(18)O_(V-SMOW)值为11.2‰～14.1‰,δ~(18)O_(H_2O)值为3.08‰～6.73‰。综合表明成矿流体主要是岩浆水，混合有少量大气降水或有机水，流体可能发生了沸腾作用，加之温度的降低，导致晚期脉状矿体氧化物-硫化物阶段主要成矿物质的沉淀。洒西钨铍矿床属于中高温热液矿床。

关键词(KeyWords)： 流体包裹体;氢-氧同位素;洒西矿床;滇东南

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划(2016YFC0600509);; 云南省麻栗坡县政府委托项目“云南省麻栗坡县老君山地区钨多金属矿成因及成矿预测研究”

作者(Author): 盛夏,张达,阙朝阳,毕珉峰,狄永军,祖世元,马慧慧

DOI: 10.19509/j.cnki.dzkq.2022.0103

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