东昆仑埃坑德勒斯特钼(铜)矿流体包裹体研究

Fluid Inclusion Study on the Aikengdelesite Mo(Cu)Ore Deposit,Eastern Kunlun

埃坑德勒斯特钼（铜）矿是近年来在东昆仑地区发现的一处斑岩型钼（铜）矿。矿区位于东昆南复合拼贴带内,矿体主要赋存于花岗斑岩及外围碎裂的二长花岗岩中。通过对含矿石英脉中流体包裹体的研究,结合成矿地质特征,认为埃坑德勒斯特钼（铜）矿成矿阶段可分为氧化物阶段（Ⅰ）、黄铁矿-磁黄铁矿-石英阶段（Ⅱ）、辉钼矿-多金属硫化物阶段（Ⅲ）及碳酸盐阶段（Ⅳ）4个阶段。矿区含矿石英脉中主要发育气液两相型包裹体和含NaCl子矿物三相包裹体,流体包裹体均一温度为150～280℃,盐度为2～30 wt（NaCl）%,密度为0.76～1.16g/cm3,成矿流体属于H2O-NaCl体系。经研究,矿区主要金属硫化物形成温度较低,为200℃左右,并确定主成矿阶段至成矿晚阶段成矿深度为1.2～3km,矿体保存较好。

Aikenglesite Mo（Cu）deposit,aporphyry molybdenum（copper）deposit newly found in Eastern Kunlun in recent years,is located in the east of Kunnan compound splicing belt.The ore bodies are found in the granite porphyry as well as the outside broken monzonitic granite.The research of fluid inclusion in veined ore-bearing quartz and metallogenic characteristics show that the mineralization process can be divided into 4stages：oxide stage（Ⅰ）,pyrite-pyrrhotite-quartz stage（Ⅱ）,molybdenite-polymetallic sulfide stage（Ⅲ）and carbonatite stage（Ⅳ）.The types of fluid inclusions mainly include gas-liquid two-phase inclusions and halite-bearing three-phase inclusions.The fluid belongs to H2O-NaCl system and the range of homogeneous temperature,salinity and density are 150-280 ℃,2-30 wt% NaCl and 0.76-1.16g/cm3.The major metal sulfides are formed in low temperature（mainly concentrated on 200℃）.After all,it is calculated that the metallogenic depth from middle to late mineralization stage is 1.2-3km,and the orebodies are well preserved.