河南围山城金银矿集区三维地质建模与成矿预测  

Three-dimensional geological modeling and mineral prospectivity mapping in the Weishancheng gold-silver district,Henan,China

作　　者：谷浩 杨泽强 高猛 唐相伟 王东晓 刘奎松 杨树人 郭跃闪 王云 王功文[3,4,5] GU Hao;YANG Zeqiang;GAO Meng;TANG Xiangwei;WANG Dongxiao;LIU Kuisong;YANG Shuren;GUO Yueshan;WANG Yun;WANG Gongwen(Henan Third Institute of Geology and Mineral Resources Survey Co.Ltd,Zhengzhou 450000,China;Henan Science and Technology Innovation Center of Natural Resources(Application Research of Information Perception Technology),Zhengzhou 450000,China;School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083,China;MNR Key Laboratory for Exploration Theory&Technology of Critical Mineral Resources,China University of Geosciences(Beijing),Beijing 100083,China;Beijing Key Laboratory of Land and Resources Information Research and Development,Beijing 100083,China)

机构地区：[1]河南省第三地质矿产调查院有限公司,河南郑州450000 [2]河南省自然资源科技创新中心(信息感知技术应用研究),河南郑州450000 [3]中国地质大学(北京)地球科学与资源学院,北京100083 [4]中国地质大学(北京)自然资源部战略性金属矿产找矿理论与技术重点实验室,北京100083 [5]北京市国土资源信息研究开发重点实验室,北京100083

出　　处：《地学前缘》2024年第3期245-259,共15页Earth Science Frontiers

基　　金：河南省地质科研项目(豫地矿科研〔2020〕3号)。

摘　　要：三维建模与成矿预测已成为当前国内外十分流行且较成熟的技术方法。通过研究银洞坡金矿和破山银矿成矿地质特征,对围山城矿集区开展三维可视化模型构建及深部成矿预测。利用82条地质剖面建立了地质体(地层、岩体、矿体)、构造模型,利用1∶5万重磁数据和63条电测深数据建立了密度、磁化率、电阻率等地球物理模型,利用52条岩石剖面、614个钻孔、117个探槽、56个浅井及94个平硐数据建立了地球化学模型,实现了地、物、化数据的综合集成。以“三位一体”找矿预测理论为指导,建立了研究区岩浆热液型Au、Ag矿床三维定量预测模型,确定了Au、Ag矿床成矿有利信息变量;采用证据权法提取了预测变量的权重值和相关程度,选择合适的变量进行成矿预测,利用C-V分形确定阈值,圈定了6个找矿靶区,选择新庄预测靶区(A 1)进行钻孔验证,发现金矿体6条,充分证明了利用证据权法进行三维成矿预测具有可行性与科学性,圈定的靶区对矿山进行深边部隐伏矿体找矿具有重要的实践意义。Three-dimensional(3D)geological modeling and mineral prospectivity mapping have currently emerged as widely adopted and well-developed technical approaches.Leveraging insights from the geological features of the Yindongpo gold deposit and the Poshan silver deposit,the application of 3D modeling and mineral prospectivity mapping has been extended to the Weishancheng district.A comprehensive understanding of geological entities(such as strata,rock formations,and ore bodies)and structural configurations has been achieved through the establishment of 82 geological profiles.Geophysical models encompassing density,magnetic susceptibility,and resistivity have been constructed using 150000 gravity and magnetic data along with 63 induced polarization datasets.Additionally,a geochemical model has been developed based on 52 rock survey profiles,614 boreholes,117 exploratory trenches,56 shallow wells,and 94-foot drills.Integration of geological,geophysical,and geochemical datasets has been accomplished through the amalgamation of the data and methodologies.Following the principles of the“Trinity”metallogenic prediction theory,a 3D quantitative prediction model for magmatic hydrothermal gold and silver deposits within the district has been formulated,leading to the establishment of exploration criteria for gold and silver deposits.Utilizing weights of evidence,the weight values and correlation degrees of the exploration criteria have been extracted to facilitate mineral prospectivity mapping.The determination of threshold values via C-V fractal analysis has resulted in the identification of six prospective targets.The application of weights of evidence for 3D mineral prospectivity mapping has been validated as a viable and scientifically sound approach.The delineated targets hold significant practical implications for the exploration of concealed ore bodies within the deep and peripheral regions of mining sites.

关 键 词：围山城矿集区 多源数据 三维地质建模 证据权法 成矿预测 

分 类 号：P628.3[天文地球—地质矿产勘探] P612[天文地球—地质学] P618.51P518.52