基于GIS的证据权重法的甘肃北祁连东段海相火山岩型铅锌矿床成矿预测评价

Metallogenic prognosis of marine volcanic type lead-zinc resources in metallogenic belt of northern Qilian based on GIS weight of evidence

基于GIS技术分析了北祁连成矿带东段海相火山岩型铅锌矿成矿条件,建立了区域海相火山岩型铅锌矿床的资源预测模型,提取了成矿预测因子,采用分级证据权重法对成矿预测因子进行了赋值,圈定了区域成矿有利远景区.研究表明:与海相火山岩型铅锌矿床有关的矿床预测权重包括地层、岩浆岩、构造等及其相关的定量化分析因子.最后依据成矿后验概率值将研究区划分了成矿远景区Ⅰ和Ⅱ.

The metallogenic conditions of marine volcanic type lead-zinc resources in the metallogenic belt of northern Qilian was analyzed by means of GIS. A prognostic model for lead-zinc ore deposits was established and the factors for mineral prediction were extracted and assigned values by graded-WOE. The favorable prospecting areas were delineated. The weighing of prediction of marine volcanic type lead-zinc resources includes strata, magmatite, structure, and other related quantitative factors. Finally, the study areas were delineated into min- eralization prospective zone Ⅰ and Ⅱ by posterior probability values.