基于GIS的证据权重法青海“三江”北段斑岩型钼铜矿产资源成矿预测

基于GIS技术的地质矿产空间数据库综合分析了青海南部"三江"北段斑岩型钼铜矿床成矿条件,建立了区域斑岩型钼铜矿床的资源预测模型,并提取了相关成矿预测因子,采用分级证据权法对成矿预测因子进行了赋值,圈定了区域有利成矿远景区,对区域矿产资源潜力进行了定量预测。研究表明,与斑岩型钼铜矿有关的矿床预测权重包括地层、岩浆岩、构造以及矿化异常等及其相关的定量化分析因子;依据后验概率值将研究区划分两个成矿远景区:纳日贡玛-东莫扎抓成矿远景区(Ⅰ)、阿多-结多成矿远景区(Ⅱ)。在两个成矿远景区内又可划分出A类铜钼矿有利靶区5处、B类铜钼矿有利靶区4处、C类铜钼矿有利靶区4处;利用丰度模型法估算青海"三江"北段区域内铜资源量为7 412 730 t,钼资源量为8 566 180 t。

Metallogenic prognosis of porphyry molybdenum-copper resources in northern Sanjiang region of Qinghai Province based on weight-of-evidence method and GIS

Based on the geological and mineral geo-database,the authors analyzed the metallogenic conditions of porphyry molybdenum-copper deposits in northern Sanjiang region by means of GIS.A prognostic model for regional ore deposits was established,and the factors of mineral prediction were extracted and assigned values by Graded-WOE.The favorable prospecting areas were delineated,and the quantitative forecast of regional resources were finally realized.The research included several aspects,and the weighing of pre...