湘西沃溪钨锑金矿床黄铁矿中发现Au-Sb矿物相  

Gold-antimony mineral phases observed in pyrite grains in the Woxi W-Sb-Au deposit,western Hunan,China.

作　　者：彭渤[1] Adam Piestrzynski 刘升友 Jadwiga Pieczonka 

机构地区：[1]湖南师范大学资源与环境学院,湖南长沙410081 [2]Ore Geology Department,AGH University of Science and Technology,30-059 Cracow,Poland [3]湖南辰州矿业有限责任公司,湖南沅陵416907

出　　处：《地质通报》2007年第5期553-559,共7页Geological Bulletin of China

基　　金：国家自然科学基金(批准号:40002021)资助

摘　　要：利用扫描电镜和电子探针等方法,对沃溪钨锑金矿床中产于(块状白钨矿-石英脉中的)黄铁矿微裂隙中的自然金和Au-Sb矿物相进行了较详细的观察和研究。结果表明,黄铁矿中Au-Sb矿物相除了有前人已经鉴定出的方锑金矿(AuSb2.13)外,还新发现有锑金矿(Au1.02Sb)矿物相。二者以显微颗粒的形式存在于黄铁矿显微裂隙中。黄铁矿微裂隙中Au-Sb矿物相的存在,指示矿床成矿在黄铁矿形成之后存在Au-Sb混溶的成矿流体。自然金、方锑金矿、锑金矿等矿物的沉淀析出可能是Au-Sb混溶流体从高温(高于350℃)向低温(250℃)演变的结果。此外,Au-Sb矿物相的发现对改进矿石冶炼中Au、Sb的分离技术有参考价值。Native gold and Au-Sb mineral phases hosted within microfractures of pyrite grains in massive scheelite-quartz veins were observed and studied intensively using the scanning electron microscope （SEM） and electron microprobe fitted with an energy dispersive spectrometer （EDS）. The results show that the Au-Sb mineral phases in pyrite include the newly found antimony gold （Au1.02Sb） mineral phase in addition to previously observed aurostibite （AuSb2 13）. The two mineral phases occur as micrograins in microfractures of pyrite. The existence of the Au-Sb mineral phases in the pyrite microfractures indicate that there existed a mixed Au and Sb ore fluid with temperature higher than 350℃ after pyrite formation during the mineralization. The precipitation and removal of the minerals such as native gold, aurostibite and antimony gold probably were resulted from the evolution of the Au and Sb coexisting fluid from higher temperatures （higher than 350℃ ） to lower temperatures （250℃）. Furthermore, the discovery of the Au-Sb mineral phases has reference value for improving the Au and Sb separation technique in ore smelting.

关 键 词：Au—Sb矿物相 方锑金矿 锑金矿 钨锑金矿床 湘西沃溪 

分 类 号：P618.67[天文地球—矿床学] P618.66[天文地球—地质学]