东昆仑大场金矿田扎家同哪矿床地质特征及找矿方向

Geological features and prospecting orientation of Zhajiatongna deposit in Dachang golden orefield of Eastern Kunlun mountain

通过野外地质现象分析认为扎家同哪矿床为低硫型浅成低温热液矿床,成矿作用与区域热流值升高驱动含矿热液沿构造破碎带充填有关。自矿体至围岩发育有硅化、绢云母化、绿泥石化、褐铁矿化、高岭土化。含矿破碎带总体表现为浅部脆性变形,岩石多呈碎裂团块状,深部为韧性变形,破碎带与围岩界线不明显。载金矿物主要为毒砂和黄铁矿等硫化物。扎家同哪金矿床以断层破碎带、土壤异常、围岩蚀变、砂金为主要的找矿标志。通过对成矿地质背景及土壤地球化学异常分析,认为矿区东部的阿棚鄂一也具有良好的找矿前景,矿床资源量有望进一步提升。

By analyzing geological phenomenon,we concluded that Zhajiatongna golden deposit is alow sulfidation epithermal one,whose mineralization was related with the structure fracture zone filling with ore-bearing hydrotherm caused by the increase of heat flow value.During the development from orebody to wall rock,there were silicification,sericitization,chloritiazation,limonitization and kaolinization.The ore-bearing fracture belt generally was brittlely deformed in the shallow part where the rocks were mostly crumby,while was toughly deformed in the deep part and the borderline between fracture zone and wall rock was unconspicuous.The gold-carrier minerals were mainly sulfide like arsenopyrite and pyrite.The prospecting criteria of Zhajiatongna deposit were mainly fault fracture zone,soil abnormity,wall rock alteration and placer gold.Through analysis of mineralization geological background and soil geochemical abnormity,it＇s considered that Apengeyi which lies in the east of the diggings has a good prospecting potential,and the deposit resources are hopeful to increase further.