内蒙古毕力赫金矿Ⅱ号矿带原生晕特征及找矿意义  

Primary Halo Characteristics of No.2 Ore Belt in Bilihe Gold Deposit,Inner Mongolia and Its Prospecting Significance

作　　者：万卫 汪明启[2] 范会虎 左立波 杨科科 WAN Wei;WANG Mingqi;FAN Huihu;ZUO Libo;YANG Keke(State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 300013,Jiangxi,China;School of Earth Sciences and Resources,China University of Geoscience(Beijing),Beijing 100083,China;Chinese Academy of Geological Sciences,Beijing 100037,China;Tianjin Geological Survey Center,China Geological Survey,Tianjin 300170,China)

机构地区：[1]东华理工大学核资源与环境国家重点实验室,江西南昌300013 [2]中国地质大学(北京)地球科学与资源学院,北京100083 [3]中国地质科学院,北京100037 [4]中国地质调查局天津地质调查中心,天津300170

出　　处：《黄金科学技术》2022年第1期34-45,共12页Gold Science and Technology

基　　金：中国地质调查局地质调查项目“内蒙古毕力赫金矿原生晕研究”(编号:D21404502);东华理工大学博士科研启动基金“地球化学测量方法在覆盖区找矿的试验性研究”(编号:DHBK2017107)联合资助。

摘　　要：毕力赫金矿位于华北克拉通北缘,是一座大型低温热液—斑岩型金矿,产于花岗闪长斑岩和围岩火山碎屑岩内外接触带中。随着矿山开采工作的持续进行,该矿山资源量面临危机,加强探边摸底工作势在必行。为了寻找有效的地球化学找矿指标,采用无火焰原子吸收光谱法(AAN)、等离子质谱法(ICP-MS)和原子荧光光谱法(AFS)等多种分析方法,对毕力赫矿区Ⅱ号矿带3个钻孔原生晕元素特征进行了研究。结果表明:毕力赫金矿化的主要指示元素组合为Au、W、Mo、As、Sb和Hg;矿区内出现2组金矿成矿指示元素组合,分别是Au-W-Mo高温元素组合和Au-As-Sb-Hg低温元素组合。其中,Au-W-Mo元素组合指示高品位金矿化,可作为区内寻找高温斑岩型金矿的主要找矿指标;Au-As-Sb-Hg元素组合指示低品位金矿化,可作为区内寻找脉状低温热液型金矿的主要找矿指标。利用原生晕找矿方法进行深部成矿预测和评价,发现了微弱的金矿化活动信息,可为研究区金矿找矿工作提供更准确的地球化学找矿指标,具有重要的实际意义。Bilihe gold deposit is a large low-temperature hydrothermal and porphyry gold metallogenic system in the northern margin of North China Craton,which is hosted in internal and external contact zone of granodiorite and surrounding pyroclastic rock.The mining area has appeared a sharp drop of resource reserves due to continuous mining work.In order to ensure the sustainable development of the mine and improve the utilization rate of gold ore resources,there has arisen a critical necessity to strengthen geochemical exploration of deepand peripheral resources in the mining area.The primary halo prospecting method directly takes rocks or ores as the research target,which is considered to be the most direct and effective deep prospecting method at present and has achieved good results in the exploration of gold deposits.This paper take the mining No.2 ore belt as the research taget and analyze various elements such as Au,Ag,Cu,Pb,W,Mo,Bi,As,Sb,Hg of the primary halo of boreholes.The characteristics of element content,element association and spatial distribution of primary halo in three boreholes of No.2 ore belt in Bilihe mining area have been studied to find effective geochemical prospecting indicators.The results show that the main indicator elements of gold mineralization in Bilihe mining area are Au,W,Mo,As,Sb and Hg.There are two groups of gold metallogenic indicator element associations in Bilihe mining area,namely,Au-W-Mo high-temperature element association and Au-As-Sb-Hg low-temperature element association.Au-W-Mo element association indicates high-grade gold mineralization,strong gold mineralization activity and large metallogenic scale,which can be used as the main prospecting indicator for high-temperature porphyry gold deposits in the mining area.Au-As-Sb-Hg element association indicate low-grade gold mineralization,relatively weak gold mineralization activity and limited metallogenic scale,which can be used as the main prospecting indicator for vein-type low-temperature hydrothermal gold deposits in the m

关 键 词：毕力赫金矿 Ⅱ号矿带 原生晕找矿方法 元素特征 深部找矿 内蒙古 

分 类 号：P618.51[天文地球—矿床学]