湘西沃溪金锑钨矿床流体包裹体特征及矿床成因  

Characteristics of fluid inclusions and genesis of Woxi Au-Sb-W deposit in western Hunan, China

作　　者：彭南海[1,2,3] 黄德志[1,2] 辛宇佳[1,2] 刘忠法[1,2] 柳永康[1,2] 

机构地区：[1]中南大学有色金属成矿预测教育部重点实验室,长沙410083 [2]中南大学地球科学与信息物理学院,长沙410083 [3]湖南省有色地质勘查研究院,长沙410015

出　　处：《中国有色金属学报》2013年第9期2605-2612,共8页The Chinese Journal of Nonferrous Metals

摘　　要：对沃溪金锑钨矿床含金石英脉流体包裹体温度、成分进行研究，并结合井下矿体特征对流体来源及矿床成因进行了探讨。结果表明，沃溪矿区含金石英脉中的流体包裹体均为LV型富液相原生包裹体，并具有中低温（均一温度集中在170～220℃之间）、低盐度（3％～6％，质量分数）及低密度（0．88～0．92g／cm^3）的特征。从包裹体成分上看，流体包裹体同时具有变质流体（中温、低盐度、高CO2含量）与大气降水w（Na＋）／w（K＋）〉2，w（F-）／w（Cl-）≥1，明显地富集Ca＋（w（Ca＋）〉w（Na＋）〉w（K＋））或Ca＋含量较高（w（Na＋）〉w（Ca＋）〉w（K＋））的成分特征，显示可能为混合流体；从矿脉地质特征来看，沃溪矿区矿脉既发育顺层脉体，又发育切层脉体，亦显示变质分异与热液充填的特征。The study on the composition and temperature of fluid inclusions inside quartz-vein from Woxi Au-Sb-W deposit and wild observation of the relationships between quartz veins and ore body were carried out to discuss the origin of ore-forming fluid and deposit genesis. The results indicate that, in Woxi mine area, fluid inclusions in gold-beating quartz veins are all LV-type liquid-rich ones, and the fluid has the characteristics of moderate or low temperature （in homogeneous temperature range of 170-220 ℃）, low salinities （3%-6%, mass fraction） and low density （0.88-0.92 g/cm3）. The composition of fluid inclusions of Woxi Au-Sb-W deposit shows that they have characteristics of both metamorphic water （moderate temperature, low salinity and high content of CO2） and meteoric water w（Na＋）/w（K＋）〉2,w（F-）/w（Cl-）≥1, w（Ca＋） 〉 w（Na＋） 〉 w（K＋） or w（Na＋） 〉 w（Ca＋） 〉 w （K＋））, which represents mixing of metamorphic water and meteoric water. The study of quartz veins shows that veins and bedded veins both exist in Woxi Au-Sb-W deposit, which also represents characteristics of both metamorphic deposit and mesothermal deposit related to meteoric water.

关 键 词：湘西沃溪金锑钨矿床 流体包裹体 成矿流体来源 矿床成因 

分 类 号：P588.121[天文地球—岩石学]