基于矿床综合预测模型金矿资源潜力评价——以辽西建平—宝国老太古宙变质岩建造金矿化带为例

辽西建平—宝国老太古宙变质岩建造金矿化带成矿潜力巨大,目前已发现金矿床(点)127处,但随着金矿开发力度及难度增大,急需寻求新的找矿突破。利用前人的地质、矿产、物探及化探等资料,建立了建平—宝国老太古宙变质岩建造金矿化带的空间数据库。重新建立了研究区金矿区域找矿模型,其中主要找矿标志包括新太古代变质深成岩、中生代中-酸性侵入岩、EW-NE-NNE-NW向断裂、Au-Ag-Cu-Pb-Zn-Mo化探异常、金重砂异常、已发现金矿床(点)。采用MRAS中的矿床综合预测模型,对研究区首次进行了基于GIS下的金矿产资源评价工作。据此圈定并优选出12处找矿靶区;并根据成矿有力度的不同由高到低划分为A、B、C 3级,其中A级找矿靶区7处,B级找矿靶区4处,C级找矿靶区1处。

Evaluation on Gold Potential Resources Based on Comprehensive Mineral Deposit Forecasting Model: A Case Study of Jianping-Baoguolao Gold Metallogenic Belt Hosted in Western Liaoning Province

Jianping-Baoguolao gold metallogenic belt in western Liaoning Province is hosted in Archean me-tamorphic formation which has big gold potential and 127 gold deposits have been discovered so far.A gold prospecting breakthrough is needed to meet the growing gold exploitation.At first,a spatial database of Jianping-Baoguolao gold metallogenic belt has been established based on previous works of geology,mineral resources,geophysics and geochemistry.Then,a regional gold prospecting model has been set up for the study area with the main prospecting criteria as Archean metamorphic formation,Mesozoic intermediate-felsic intrusions,EW-NE-NNE-NW fractures,Au-Ag-Cu-Pb-Zn-Mo geochemical anomalies,Au heavy sand anomaly and known gold deposits.Thirdly,based on GIS and using the mineral deposit comprehensive forecasting model in MRAS to evaluate the mineral resources of the study area Finally,twelve ore-prospecting target areas have been circled,which are further divided into A-B-C three levels based on their mineralization possibilities with A-level ore-prospecting areas of seven,B-level of four and C level of one.