基于MRAS的证据权重法在香格里拉地区的综合信息成矿预测  

Multi-source Information Metallogenic Prognosis with Weighting of Evidence Based on MRAS in Shangri-La

作　　者：薛顺荣[1] 肖克炎[1] 丁建华[1] 

机构地区：[1]中国地质科学院矿产资源研究所

出　　处：《吉林大学学报（地球科学版）》2008年第5期738-744,共7页Journal of Jilin University：Earth Science Edition

基　　金：中国地质调查局大调查项目(200420190004)

摘　　要：在成矿地质背景分析和以普朗斑岩型铜矿为主的典型矿床研究基础上,通过对香格里拉地区已知矿床点与区域地质、重力、航磁、水系沉积物、重砂和遥感等数据资料再次处理及与解译成果的空间关联分析,确定斑岩型铜多金属矿的找矿标志,以此为依据提取和构置各类地学综合成矿信息预测变量。基于MRAS证据权重法,以2 km×2 km网格单元计算得到的后验概率,最大值与最小值4级优选分级评价了研究区斑岩型铜多金属矿的A、B、C 3个级别的找矿预测远景区。结果显示,普朗特大型斑岩型铜矿,红山夕卡岩-斑岩型铜矿,目前已取得重要找矿进展的松诺、欠虽、亚杂等铜多金属矿床点和具有较大找矿潜力的拉巴铜矿点均落在A级远景区。这表明综合信息成矿预测图直观表达了香格里拉地区斑岩型铜多金属矿成矿系列总体找矿潜力。Based on study of minerogenetic background and typical deposit—Pulang porphyry copper deposit,the space relationship between known occurrences and regional geologic gravity,aeromagnetic,geochemical and remote sensing data were analyzed in Shangri-La area.The prospecting criteria of porphyry copper deposit were generalized,according to which geologic variants have been extracted and established.Weighting of evidence based on MRAS was used here to calculate posterior probability of all grid cells of 2 km by 2 km forecasting prospect areas have been divided into three grades of A,B and C.Comparative analysis shows that Pulang super-large porphyry copper deposit,Hongshan skarn-porphyry copper deposit,and some copper polymetal deposits（occurrences） such as Songnuo,Qiansui,Yaza and Laba were all matched with grade A prospect area,which shows that the assessment results can reasonably reflect potentiality of porphyry copper deposit in Shangri-La area,and the results can be used as reference to deploy the further work.

关 键 词：综合信息 成矿预测 MRAS 证据权重法 香格里拉 

分 类 号：P622.6[天文地球—地质矿产勘探]