哈萨克斯坦库尕德里金矿床流体包裹体特征及矿床成因研究

Fluid Inclusion Studies and the Genesis of the Kugadri Gold Deposit,Kazakhstan

库尕德里金矿床位于哈萨克斯坦楚伊犁–天山成矿省楚伊犁成矿带之楚河–肯得克塔斯金、铅、锌、铜、钼成矿亚带,大地构造位置属于中亚造山带之哈萨克斯坦–准噶尔板块的穆云库姆–克齐尔库姆–伊犁微板块之肯得克塔斯地块。库尕德里金矿床为该区重要的大型矿床之一,该矿床成矿流体的研究,对深化矿床成因认识、区域成矿规律研究和找矿勘查工作有重要的指导意义。笔者在研究区地质调查和矿床地质特征研究的基础上,开展成矿阶段含矿石英脉流体包裹体岩相学、显微测温和激光拉曼分析。结果表明:库尕德里金矿流体包裹体有C、W、S等3种类型;C型包裹体完全均一温度为278~421℃,盐度为0~13.9wt%NaCleqv;W型包裹体完全均一温度为119~378℃,盐度为1.1~22.9wt%NaCleqv;S型包裹体完全均一温度为136~327℃,盐度为29.1~31.0wt%NaCleqv。成矿压力和深度估算结果表明:成矿压力为95~200MPa,成矿深度约为2~5 km,成矿温度为290~380℃。结合矿床地质特征认为,库尕德里金矿成矿流体具有富CO_(2)、中低盐度的变质流体特征,矿床成因为造山型金矿。

The Kugadri gold deposit is located in the Chuhe-Kendektas gold,lead,zinc,copper and molybde-num metallogenic subzone of the Chuhe-Kendektas gold,lead,zinc,copper and molybdenum metallogenic sub-zone of the Chuyili-Tianshan metallogenic province in Kazakhstan.The geotectonic location belongs to the Muyunkumu-Kezirkumu-Ili microplate of the Kazakhstan-Junggar plate in the Central Asian orogenic belt.The Kugadri gold deposit is one of the important large deposits in this area.The study of the ore-forming fluid of the deposit has important guiding significance for deepening the understanding of the genesis of the deposit,the study of the regional metallogenic regularity and the prospecting and exploration work.Based on the geological survey of the mining area and the study of the geological characteristics of the deposit,this paper carried out the petrography,microthermometry and laser Raman analysis of ore-bearing quartz vein fluid inclusions in the met-allogenic stage.The results show that there are three types of fluid inclusions in Kugadri gold deposit:C,W and S;the complete homogenization temperature of C-type inclusions is 278~421℃,and the salinity is 0~13.9 wt%NaCleqv.The complete homogenization temperature of W-type inclusions is 119~378℃,and the salinity is 1.1~22.9 wt%NaCleqv.The complete homogenization temperature of S-type inclusions is 136~327℃,and the salinity is 29.1~31.0 wt%NaCleqv.The estimation of metallogenic pressure and depth shows that the metallogenic pressure is 95~200 MPa,the metallogenic depth is about 2~5 km,and the metallogenic temperature is 290~380℃.Combined with the geological characteristics of the deposit,it is considered that the ore-forming fluid of the Kugadri gold deposit has the characteristics of CO_(2)-rich,medium-low salinity metamor-phic fluid,and the genesis of the deposit is orogenic gold deposit.