甘肃省两当县大店沟金矿找矿预测及验证  

PREDICTION AND VERIFICATION OF MINERAL EXPLORATION FOR DADIANGOU GOLD MINE IN LIANGDANG COUNTY,GANSU PROVINCE

作　　者：王文举 艾忠林 WANG Wen-ju;AI Zhong-lin(Shaanxi Taibai Gold Mining Co.,Ltd.,Taibai 721607,China;Gansu Zhongjin Gold Mining Co.,Ltd.Longnan 742400,China)

机构地区：[1]陕西太白黄金矿业有限责任公司,陕西太白721607 [2]甘肃中金黄金矿业有限责任公司,甘肃陇南742400

出　　处：《甘肃地质》2024年第4期26-32,62,共8页Gansu Geology

摘　　要：两当县大店沟金矿位于北秦岭西段,赋矿地层为震旦—奥陶系丹凤群木其滩组,岩性为绢云母绿泥石英片岩,金矿化主要产于60°~70°走向的退色蚀变韧性剪切带,韧性剪切带主要发育于第三岩性段中;矿床的主要控制因素为退色蚀变韧性剪切构造带+黄铁矿化+石英脉,矿石类型为石英脉型金矿石和蚀变岩型金矿石。据控矿规律和矿化信息、原生晕指示元素异常发育地段、剥蚀率较低的深部及黄铁矿热电系数高值区、深部、边缘未封闭延伸方向,黄铁矿热电性及蚀变矿物白云母、绿泥石、伊利石等蚀变矿物发育地段、流体包裹体测温170℃~220℃温度区间等特征进行找矿预测,通过对两个预测靶区(BQ1、BQ2)进行验证,验证效果较佳,扩大了矿体规模,表明大店沟金矿深部具备良好的找矿前景。The Dadiangou Gold Mine in Liangdang County is located in the western section of the North Qinling Mountains,with the ore bearing strata being the Muqitan Formation of the Danfeng Group in the Sinian Ordovician period.The lithology is sericite green mud quartz schist,and gold mineralization mainly occurs in the60°~70°trending weathered ductile shear zone,which is mainly developed in the third lithological segment;The main controlling factors of the deposit are the fading alteration ductile shear structural zone+pyrite mineralization+quartz vein,and the ore types are quartz vein type gold ore and altered rock type gold ore.Based on the characteristics of ore control laws and mineralization information,abnormal development of primary halo indicator elements,deep areas with low erosion rates,high-value areas of pyrite thermoelectric coefficient,deep areas,unsealed extension directions of edges,pyrite thermoelectric properties,and the development of altered minerals such as muscovite,chlorite,and illite,as well as fluid inclusion temperature ranges of 170℃~220℃,mineral exploration predictions were made.By verifying the two predicted target areas(BQ1 and BQ2),the verification effect was better,expanding the scale of the ore body and indicating that the deep part of the Dadiangou gold deposit has good prospecting prospects.

关 键 词：找矿预测 韧性剪切带 控矿规律 靶区验证 大店沟金矿 甘肃 

分 类 号：P618.51[天文地球—矿床学]