甘肃白银厂及其外围磁异常特征及找矿预测  

MAGNETIC ANOMALIES AND PROSPECTING IN BAIYINCHANG MINE FIELDS AND VICINITY,GANSU PROVINCE

作　　者：刘彦良 唐胜军 高雅 丁志军 季文中 郭东宝 LIU Yan-liang;TANG Sheng-jun;GAO Ya;DING Zhi-jun;JI Wen-zhong;GUO Dong-bao(Gansu institute of Geological Survey for Nonferrous Metals,Lanzhou 730000,China;Key Laboratory of Strategic Mineral Resources in the Upper Yellow River Area,Lanzhou 730000,China;Lanzhou Mineral Exploration Institute,Gansu Provincial Bureau of Nonferrous Metal Geological Exploration,Lanzhou 730000,China)

机构地区：[1]甘肃省有色地质调查院,甘肃兰州730000 [2]自然资源部黄河上游战略性矿产资源重点实验室,甘肃兰州730000 [3]甘肃省有色金属地质勘查局兰州矿产勘查院,甘肃兰州730000

出　　处：《甘肃地质》2023年第4期31-41,共11页Gansu Geology

基　　金：中国地质调查局公益性地质调查项目“甘肃省白银厂及其外围地区矿产远景调查(1212011120563)”;甘肃省自然资源厅自然资源青年人才(团队)项目“甘肃省徽县洛坝外围铅锌金找矿及成矿规律研究”联合资助。

摘　　要：在白银厂铜矿深部及外围地区开展地质找矿任务十分紧迫。磁法在辅助金属矿深部找矿方面效果良好,研究该区磁异常特征可为深部找矿提供依据和参考。本文通过梳理白银厂及其外围1∶50 000地面高精度磁法和航磁实测资料,阐明了该区的岩(矿)石磁性、磁场分布和局部磁异常等特征。利用多种位场转换处理法结合多点实测校正的方法,综合分析磁异常与地层、岩浆岩、构造、矿化蚀变等成矿条件之间的联系,圈定局部磁异常20个,解译断裂构造18条、隐伏—半隐伏岩体6个,并对圈定的局部磁异常进行了解释推断和分类评价。研究结果表明:白银厂铜矿深部及外围地区成矿潜力较好,综合区域成矿规律和地质成矿背景,归纳地球物理找矿信息,进一步优选出找矿远景区7处。研究找矿远景区的特征,指明找矿方向,分析成矿潜力,以期为后续资源勘查提供磁异常依据和参考。As the pressing task of proceeding ore prospecting at deep and vicinity area of Baiyinchang copper deposit,magnetic methodology has acquired outstanding effect in assisting ore prospecting at deep site.The magnetic anomaly at this area is able to provide evidence and reference for ore prospecting at deep area.This assay has manifested this area's magnetism of rock,magnetic field distribution and characteristics of magnetic anomaly at locality according to both 1:50000 survey of high-precision ground magnetic and aeromagnetic data.Meanwhile,by applying methodology of multiple potential field conversion processing and multipoint measurement correction,combining the relationship between magnetic anomaly and mineralization conditions including stratum,magmatite,structure,mineralized alteration,etc.,20 magnetic anomaly areas are delineated;18 fault structures,6 concealed,semi-concealed rock mass are explained,part of determined magnetic anomaly areas are inferred and evaluated.The result has revealed that the deep and vicinity area of Baiyinchang copper deposit owns excellent mineralization in potential,furthermore,7 prospecting areas have been determined according to regional mineralization regulations,geological and geophysical background.Researching on the characteristics of prospecting areas and mineralization potential is able to define prospecting directions and provide magnetic anomaly references for subsequent prospecting work.

关 键 词：甘肃白银厂及其外围 磁异常特征 找矿预测 

分 类 号：P631[天文地球—地质矿产勘探] P618[天文地球—地质学]