新疆阿希勒金矿床成矿流体特征  

Characteristics of ore-forming fluid in Axile Gold Deposit,Xinjiang

作　　者：卫晓锋[1,2] 徐九华[1] 阴元军[2] 单立华[1] 

机构地区：[1]北京科技大学,北京100083 [2]有色金属矿产地质调查中心,北京100012

出　　处：《有色金属（矿山部分）》2011年第4期29-35,共7页NONFERROUS METALS(Mining Section）

基　　金：国家自然科学基金项目(40972066;40672060);国家科技支撑计划资助项目(新疆305项目2007BAB25B01)

摘　　要：阿希勒金矿床处于额尔齐斯构造成矿带西北段-玛尔卡库里成矿带。通过流体包裹体研究,认为包裹体类型为富CO2的两相包裹体LH2O-LCO2、水溶液两相包裹体(L-V)、纯H2O的单相包裹体。包裹体均一温度值为97.8～298.7℃,盐度为1.81～14.41wt%NaCl.eq,流体密度为0.59～0.83 g/cm3,属于中低温、低盐度、中等密度流体。流体成分主要有H2O、CO2和少量CH4、C2H6、N2。氢氧同位素δ18OH2O值为-0.69‰～-2.48‰,δD值为-86.88‰～97.24‰,显示大气降水参与成矿。韧性-韧脆性-脆性的构造变形,引发流体不混溶和沸腾作用,形成还原环境,络合物稳定性降低,金析出沉淀成矿。Axile Gold Deposit is located at the northwest of Erqi structural zone-maerkakul structural zone.Through the study on fluid inclusions,it is confirmed that the types of fluid inclusions in the Axial gold deposit are CO2-rich inclusions（LH2O-LCO2）,aqueous inclusions（L-V） and monophase aqueous inclusions.The homogenization temperature is 97.8～298.7℃,with salinity from 1.81 wt% NaCl.eq to 14.41wt%NaCl.eq and density from 0.59 g/cm3 to 0.83 g/cm3,so the fluid characteristics reflect that it is in low-temperature,low salinity and low-density environment.The main compositions include H2O,CO2 and a little of CH4、C2H6、N2.The data of δ18OH20（-0.69‰ to-2.48‰） and δD（-86.88‰ to 97.24‰） suggest that meteoric water involve in the mineralization.The tectonic deformation mechanism from ductile to brittle-ductile to brittle causes fluid unmixing,abnormal temperature,and forms reductive environment.Then the complex stability is reduced and deposited to form gold deposit.

关 键 词：流体包裹体 构造-流体演化 成矿作用 阿希勒金矿床 

分 类 号：P611[天文地球—矿床学]