湖南瑶岗仙钨矿床流体包裹体特征及其意义
Characteristics and significance of the fluid inclusions from Yaogangxian tungsten deposit in south of Hunan
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摘要: 对瑶岗仙石英脉型钨矿床的石英、萤石和夕卡岩型钨矿床中石榴石流体包裹体的岩相学特征研究表明,与成矿有关的包裹体主要有三类:富液相、富气相和含子晶的多相包裹体。脉型钨矿床中石英包裹体均一温度范围为180℃-300℃,盐度O.88—6.45wt%NaCleqv;矽卡岩型钨矿床中石榴石包裹体的均一温度范围为190℃~300℃,盐度0.1~8.95wt%NaCleqv;成矿溶液的密度为0.81~0.89g/cm^3.表明形成这两种类型矿床的成矿流体均属于中温、低盐度、低密度的流体;成矿压力为120~160MPa,成矿深度约为7—9km,因此该矿床是在中高压力、中深成条件下形成的。激光拉曼探针分析表明,石英中包裹体的气相成分比石榴石中的更富含CH4、CO2和H2O等挥发份,说明流体是一种介于岩浆与热液之间的过渡性流体,具有上部偏液、下部偏浆的特点。由于该区自燕山期以来软流圈上隆,岩石圈经历了强烈的伸展、减薄作用和壳幔相互作用,而C-H还原性组分的增加,指示流体很可能来自于深部的地幔过渡带或者软流圈。
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