藏南康马县布主金(锑)矿土壤地球化学异常信息提取及成矿预测  

Soil Geochemical Anomaly Information Extraction and Metallogenic Prediction of the Buzhu Gold(Antimony)Deposit in the Kangma County,South Tibet

作　　者：张宇 魏俊浩[1,2] 石文杰 李国猛[1] 周新琪 毛国正 刘成林 ZHANG Yu;WEI Junhao;SHI Wenjie;LI Guomeng;ZHOU Xinqi;Mao Guozheng;LIU Chenglin(School of Earth Resources,China University of Geosciences,Wuhan 430074,Hubei,China;National Demonstration Center for Experimental Mineral Exploration Education,Wuhan 430074,Hubei,China;Tibet Engineering Survey and Construction(Group)Co.,Ltd.,Lhasa 850000,Tibet,China)

机构地区：[1]中国地质大学资源学院,湖北武汉430074 [2]固体矿产勘查国家级实验教学示范中心,湖北武汉430074 [3]西藏工程勘察施工(集团)有限责任公司,西藏拉萨850000

出　　处：《黄金科学技术》2022年第1期1-18,共18页Gold Science and Technology

基　　金：山东省煤田地质局基金项目“山东省牟平—乳山成矿带三维综合找矿模型构建与深部找矿预测”(编号:鲁煤地科字[2019]4号);山东恒邦冶炼股份有限公司科研项目“山东省烟台市牟平区东道口矿区成矿规律研究及深部找矿预测项目”(编号:2020026143)联合资助。

摘　　要：康马地区处于特提斯喜马拉雅构造域东段,是青藏高原具特色和重要的金(锑)成矿带。布主金(锑)矿处于EW向断裂与SN向断裂交会部位的康马地区,成矿地质条件良好。为解决布主地区的找矿问题,本文以藏南康马县布主金(锑)矿1∶1万土壤地球化学测量为研究对象,运用元素的变化系数及富集离散特征对研究区土壤地球化学测量的8种微量元素进行统计分析,论述了8种微量元素的成矿潜力,得出Au、Ag、As、Sb和Pb这5种微量元素具有较大的成矿潜力,并采用聚类分析、相关分析和因子分析研究元素组合规律,共划分了3组元素组合(Au-Ag-As-Sb组合、Pb-Zn组合和Hg-Cu组合)。应用平均值±3倍标准差的方法研究地球化学异常并确定其异常下限,结合衬度异常圈定法圈定了与Au元素相关性较好的主要元素综合异常7处(HS-1~HS-7),并结合区域成矿地质背景和研究区地质—地球化学特征,圈定了有利找矿靶区2处。经野外地质调查发现,靶区1发现褐铁矿化石英脉,局部发生强烈褐铁矿化,为下一步重点找矿地段,显示了土壤地球化学在本区找矿的有效性。Kangma area is located in the eastern part of the Tethys Himalayan tectonic domain,and it is a characteristic and important gold(antimony)metallogenic belt in the Qinghai-Tibet Plateau.Buzhu gold(antimony)deposit is located in the Kangma area where the EW trending fault and SN trending fault intersect,and the metallogenic geological conditions are good.In this paper,1∶10000 soil geochemical survey of Buzhu gold(antimony)deposit in Kangma County,southern Tibet was studied.Eight trace elements from soil geochemical survey in the study area were analyzed statistically by using the coefficient of change of elements and the discrete characteristics of element enrichment.By discussing the metallogenic potential of eight trace elements and combining with the characteristics of Au,Ag,As,Sb and Pb with high coefficient of variation,large degree of dispersion and many mineralization in the study area,it is considered that Au is the main metallogenic element in the study area,and Ag,As,Sb and Pb can be used as important indicator elements to search for gold deposits in this area.Cluster analysis,correlation analysis and factor analysis were used to study the rule of element association.Three groups of element association were divided.The first group was the element association of Au,Ag,As and Sb,the second was the element association of Pb and Zn,and the third was the element association of Hg and Cu.Among them,the first group of Au,Ag,As,Sb element assemblage is the main ore-forming element assemblage in the study area,Au is the most important ore-forming element in the study area,Ag,As,Sb element is an important indicator element to search for gold deposits in the area,which has a good ore-prospecting prospect.The method of mean±3 times standard deviation was used to study the geochemical anomalies and determine the lower limit of the anomalies.Combined with the contrast anomaly delineation method,seven major element comprehensive anomalies(HS-1~HS-7)with good correlation with gold elements were delineated.Combined wit

关 键 词：金(锑)矿床 地球化学特征 衬度异常圈定法 靶区圈定 成矿预测 康马县 

分 类 号：P618.51[天文地球—矿床学]