桂西北地区微细粒型金矿成矿信息与定量预测评价

THE METALLOGENIC INFORMATION AND TNE QUANTITATIVE FORECASTING ASSESSMENT OF MICRO-GRAINED GOLDDEPOSITS IN NORTHWESTERN GUANGXI

近年找矿有重大突破的桂西北地区微细粒型金矿.具有很大的经济价值和找矿远景。通过研究,其成矿信息特征主要是:(1)地幔隆起两侧的深部拗陷带内;(2)主断裂旁次级断裂、多组断裂复合部位;(3)背斜周边碎屑岩分布区;(4)中三叠世水下隆起边缘;(5)赋矿层位T_2b;(6)有利岩性有泥岩、粉砂岩、细砂岩;(7)与隐伏花岗岩关系密切;(8)

In this paper,on the basis of analyzing the controlling factor and the metallogenic information of micro-flne-grained gold deposits in the northwestern region of Guangxi,39 geological variables have been pick up.The locating assessment of gold deposit has been made by using multiple methods and based on the critical values for dividing the metallogenic grade as an assessment index in the 34200 km^2 area and the favourable metallogenic sectors and the important prospecting targets were effectively delineated,and the quantitative forecasting has been made by using different methods,as aresult,forecasting believability is higher,It is indicated that the area is the great potential of gold resources.