西藏白容铜矿EH-4数据综合解译与深部找矿预测

EH-4 Data Comprehensive Interpretation and Deep Prospecting of Bairong Copper Depositin Tibet

西藏白容铜矿为近期发现的一斑岩型铜矿床,查明矿区北部深部二长花岗斑岩埋深、形态及矿(化)体分布情况是进一步勘探的关键。在白容铜矿北部选择有利成矿地段进行EH-4连续电导率剖面测量,根据白容矿区岩(矿)石电性差异,通过二维定性、定量反演结合矿床地质模型,对拟二维等值线剖面进行综合地质解译。结果表明:二维视电阻率-深度剖面图能清晰地反映地下不同地质体的精细电阻率结构,整个剖面可划分为5种截然不同的电性体。其中,Ⅳ高阻体为隐伏二长花岗斑岩,Ⅲ层中等电阻体为石英二长斑岩体;Ⅴ层低阻体共有三处,为火山热液及斑岩有关的Cu、Mo矿化(体)。

The Bairong copper deposit of Tibet is a porphyry-type deposit discovered recently. The key for the further exploration is to identify burial depth, morphology and mineral body distribution of monzogranite porphyry in the northern part of the deep mine. An EH4 continuous conductivity profile was measured at the favorable metallogenic district in the northern part of Bairong copper deposit. The elec- trical difference in the mining-induced rock （ore） was used to interpret the comprehensive geology of quasi-two-dimensional contour section through two-dimensional qualitative and quantitative inversion com- bined with the geological model of the deposit. The results showed that the two-dimensional apparent re- sistivity - depth sectional drawing can clearly reflect the underground different geologic body of elaborate resistivity structure. The whole section can be divided into five kinds of different electrical body, among whichlayerlV of high resistance is speculated for concealed monzogranite porphyry body; Layer roof me- dium resistance is speculated for quartz monzonitic porphyry; Layer V of low resistance body consists of three parts, suggesting volcanic hydrothermal and porphyry Cu, Mo mineralization （body）