黑龙江多宝山地区永新金矿床构造叠加晕特征及深部找矿预测  

Characteristics of Structural Superimposed Halo and Deep Prospecting Prediction of Yongxin Gold Deposit,Duobaoshan Area,Heilongjiang Province

作　　者：李成禄 符安宗 徐文喜 袁茂文 刘宝山[3] 杨文鹏 赵瑞君 赵忠海 LI Chenglu;FU Anzong;XU Wenxi;YUAN Maowen;LIU Baoshan;YANG Wenpeng;ZHAO Ruijun;ZHAO Zhonghai(Natural Resources Survey Institute of Heilongjiang Province,Harbin,Heilongjiang 150036,China;China University of Geosciences(Beijing),Beijing 100083,China;Shenyang Geological Survey Center,China Geological Survey,Shenyang,Liaoning 110034,China;College of Mining,Liaoning Technical University,Fuxin,Liaoning 123000,China)

机构地区：[1]黑龙江省自然资源调查院,黑龙江哈尔滨150036 [2]中国地质大学(北京),北京100083 [3]中国地质调查局沈阳地质调查中心,辽宁沈阳110034 [4]辽宁工程技术大学,辽宁阜新123000

出　　处：《现代地质》2023年第3期674-689,共16页Geoscience

基　　金：黑龙江省重点研发计划(GA21A204);国家自然科学基金(41872038);黑龙江省国土资源科研项目(201603);辽宁省自然科学基金项目(2020-BS-258)。

摘　　要：永新金矿床是近年来多宝山矿集区外围取得的重大找矿成果之一,是嫩江—黑河地区首次发现的与构造混杂岩带有关的中大型浅成低温热液型金矿床。金矿体延长400余米,深部延伸近1600 m,倾角20°~30°,严格受构造控制。目前深部勘查显示矿体明显变薄,品位变低,为进一步明确深部成矿潜力,本次对矿区不同勘探线构造叠加晕样品进行了元素地球化学研究,以期指导下一步勘查方向。地球化学分析结果统计表明,永新金矿床元素组合为Au、Ag、Pb、Mo、W、Bi、Mn、Te,其中Au是形成金矿体的最直接、最重要的指示元素,Ag、Te是重要伴生指示元素。综合各指示元素异常特征,揭示永新金矿单一次成矿的轴向分带序列为:Sb、As、Hg(前缘晕特征指示元素)→Ag、Au、Te、Pb、Zn、Cu(近矿晕特征指示元素)→(Bi)、Mo、Mn、Co(尾晕特征指示元素)。矿体轴向特征分析显示,矿体尾部出现尾晕与前缘晕共存特征。依据构造叠加晕预测标志和地质标志在永新金矿床金矿体水平投影图上提出了1个深部盲矿预测靶位和1个有利成矿部位,其中靶位处于205线—225线之间,有利成矿部位位于235线—245线之间,均表现为矿体中、下部出现前、尾晕共存,并且前缘元素及近矿元素异常明显强于尾晕元素异常,指示矿体向下延伸很深,深部值得继续进行勘查工作。The Yongxin gold deposit is one of the major prospecting achievements in recent years in the periphery of the Duobaoshan ore concentration area in Heilongjiang Province.It is the first discovered large-scale epithermal-type gold deposit related to the Nenjiang-Heihe mélange belt.The orebody has dip angle of 20°-30°,strictly controlled by structures,and extends over 400-meter long and nearly 1,600-meter deep.Deep exploration shows that the orebody is obviously thinner and the grade is lower.To further clarify the mineralization potential at depth and guide future exploration,the tectonic superimposed halo samples were taken in different exploration lines of the mining area for geochemical analyses.The geochemical statistical analysis shows that the element assemblage at Yongxin comprises Au,Ag,Pb,Mo,W,Bi,Mn and Te,among which Au is the most direct and important indicator for the formation of gold orebodies and Ag-Te is an important associated element.Based on the axial distribution characteristics of the inner,middle,and outer zone anomalies of each indicator element in the orebody,the axial zoning sequence of orebody halo at Yongxin is established:Sb-As-Hg→Ag-Au-Te-Pb-Zn-Cu→(Bi)-Mo-Mn-Co.Among them,Sb-As-Hg are the frontal halo indicator elements,Ag-Au-Te-Pb-Zn-Cu are the near-ore indicator elements,Mo-Mn-Co are the terminal halo indicator elements.The orebody axial characteristics show that the frontal-terminal halo coexists in the margin of orebody,indicating possible existence of orebody in deep structures.According to the prediction mark of tectonic superimposed halo and geological mark,a concealed ore prediction target and a favorable ore-forming site are proposed on the horizontal projection map.The targets are located between No.205 and 225 exploration lines,whilst the favorable ore-forming sites are located between No.235 and 245 exploration lines.Both show the coexistence of frontal and terminal halo in the middle and lower parts of the orebody,and the anomalies of frontal and near-ore elements ar

关 键 词：构造叠加晕 地球化学 深部找矿预测 永新金矿 多宝山地区 黑龙江省 

分 类 号：P595[天文地球—地球化学] P612[天文地球—地质学] P618.51P632