西藏多不杂—波龙矿集区铜矿床地质特征及找矿预测模型

西藏多不杂—波龙矿集区位于金沙江缝合带和怒江缝合带之间,缝合带内已发现了多个成带状分布的金、铜、铬矿床,成矿地质条件优越。在详细分析多不杂—波龙矿集区地层、构造、岩浆岩、物化遥特征的基础上,以该矿集区内的多不杂铜矿为例,详细研究了该矿床的地质特征,并构建了包含岩浆岩特征、控矿构造特征、围岩蚀变特征、地层岩石类型、物化遥异常特征以及表生矿物组构的找矿预测模型。研究表明:经工程验证发现在多不杂—波龙集矿区的尕尔勤铜矿区内存在一个长10 km、宽3 km的巨型蚀变体,经ZK1901钻孔深部验证,当钻孔穿越300~400m厚的黄铁矿+硅化带后,逐渐出现了铜矿化体,且随着深度的增加,铜矿化更趋明显;在该集矿区NW侧存在规模较小的铜矿床,SE侧存在一个规模较大的黄铁矿,前者形成于距晓坑火山2.5 km处,沿NW走向的断裂破碎带区域内,晓坑火山机构SE侧2.5 km范围内的主含矿断裂为该矿集区下一步的重点找矿区域。上述分析对于在该矿集区进一步开展铜矿及其他多金属矿找矿勘探工作有一定的借鉴价值。

Prospecting Prediction Model and Geological Characteristics of the Copper Deposit in Duobuza-Bolong Ore Concentration Area in Tibet

Duobuza-Bolong ore concentration area in Tibet is located between the Jinshan River Suture Zone and Nu Riv-er Suture Zone,many zonal distributed deposits of copper,gold,chrome are found in the suture zones,the metallogenic condi-tions of the area is good. Based on the newly prospecting results of the area,the stratum,structure,magmatic rock and geophysi-cal,geochemical and remote sensing characteristics of the area are analyzed in detail, taking Duobuza Copper Deposit in Duobuza-Bolong ore concentration area as the study example,the deposit geological characteristics is discussed. Based on the a-bove analysis results,the prospecting prediction model related to magmatic rock characteristics,ore-controlling structure charac-teristics,surrounding rock alteration characteristics,stratum rock type,geophysical,geochemical and remote sensing anomalies characteristics is established. The study results show that:the huge alteration rock mass with the length of 10 km,width of 3 km in Gaerqin Copper Mining Area in Duobuza-Bolong ore concentration area is found by engineering verification,the depth verifi-cation results of ZK1901 drill show that the copper mineralization body is found gradually after the pyrite and silicification zone with the depth of 300~400 m by ZK1901 drill,with the increasing of drilling depth,the copper mineralization characteristics is more obvious;the copper deposits with small scale are distributed in the northwest of Duobuza-Bolong ore concentration area, the pyrite deposit with large scale is distributed in the southeast of Duobuza-Bolong ore concentration area,the formation area of the former deposit is located in the NW trending fracture zone,and it is away from Xiaokeng Volcano about 2. 5 km,the main ore-bearing fault away from Xiaokeng Volcano about 2. 5 km in the southwest direction of Xiaokeng Volcano can be taken as the further key prospecting area in Duobuza-Bolong ore concentration area.