青海北巴颜喀拉成矿带基于专家证据权重法锑金矿资源潜力评价  

Sb-Au Mineral Potential Mapping Based on Expert Weights of Evidence in North Bayan Har Metallogenic Belt in Qinghai Province

作　　者：丁清峰[1,2] 张本龙[1] 王冠[1] 金圣凯[1] 

机构地区：[1]吉林大学地球科学学院,长春130061 [2]南京大学地球科学与工程学院/内生金属矿床成矿机制研究国家重点实验室,南京210093

出　　处：《吉林大学学报（地球科学版）》2011年第5期1423-1431,共9页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金项目(40802021);吉林大学基本科研业务费专项(421030454422)

摘　　要：青海北巴颜喀拉成矿带虽然总体研究程度低,但显示出巨大的找矿潜力,急需寻求新的找矿突破。利用前人的地质、矿产、化探等资料,建立了青海北巴颜喀拉成矿带基于GIS的空间数据库。在此基础上重新建立了研究区锑金矿区域找矿模型,其中主要找矿标志包括金水系沉积物异常、锑水系沉积物异常、砷水系沉积物异常、重砂异常、NW—NWW向线性构造和巴颜喀拉山群。采用作者提出的专家证据权重法,对研究区首次进行了基于GIS下的专家证据权重法矿产资源评价工作。据此重新圈定找矿远景区和找矿靶区,将后验概率大于0.001的区域作为找矿远景区,将后验概率大于0.005的区域作为找矿靶区;并依据找矿靶区内预测含矿区域后验概率二重积分大小,将找矿靶区的找矿潜力级别由高到低分别划分为A、B、C 3级,其中A级6处,B级10处,C级13处。Although generally not much researches have been done,the North Bayan Har metallogenic belt in Qinghai Province shown great mineral potentials and more prospecting achievement is expected.By synthesizing information from geology,geochemical prospecting,and mineral deposits etc.,the author build a GIS-based spatial database for North Bayan Har metallogenic belt in Qinghai Province.Then a new regional ore exploration model is built,in which prospective symbols including Au,Sb and As anomalies of stream sediment,heavy concentrate anomalies,NW-NWW striked linear structures and the Bayan Har group.And GIS-based mineral potential mapping is finished in the study area according to expert weights of evidence proposed by the present author earlier.Prospective areas and prospecting targets are mapped again,and prospective areas are defined as the area whose posterior probabilities are more than 0.001,and prospecting targets are the districts whose posterior probabilities are more than 0.005.Then prospecting potential grades of prospecting targets are divided into level A,B C based on double integrals of posterior probabilities of every forecasting ore-bearing grid in the study area.They consist of 6 prospecting targets with level A,10 ones with level B and 13 ones with level C.

关 键 词：青海 北巴颜喀拉 专家证据权重法 锑金矿 资源潜力评价 矿产 

分 类 号：P618.66[天文地球—矿床学]