西藏班公湖——怒江成矿带东段热昌金多金属矿地质特征及找矿预测

Geological Characteristics and Prospecting Prediction of Rechang Gold Polymetallic Deposit in the Eastern Section of Bangonghu-Nujiang Metallogenic Belt,Tibet

热昌金多金属矿位于班公湖—怒江成矿带东段,大地构造位置处于那曲—洛隆弧前盆地南缘,成矿地质背景和成矿地质条件优越,是寻找金银铜铅锌多金属矿的有利地区。为初步查明区内矿产资源远景,圈定找矿靶区,采用1∶10000土壤测量+1∶10000地质填图+遥感地质解译+激电测深+工程验证的技术方法组合对矿区开展了初步评价,发现金矿体9条、金银矿体3条、铜矿体4条,初步确定矿床成因类型为斑岩—浅成低温热液型,成矿岩体为黑云二长花岗斑岩隐伏岩体。在此基础上,通过对矿床地质特征、物化探异常特征及遥感影像特征的综合研究,系统地总结了矿床的找矿标志,圈定了3处矿化潜力较大的找矿靶区,为后续勘查工作部署提供了依据。研究成果对于班公湖—怒江成矿带东段的区域性找矿具有重要的借鉴和启示意义。

The Rechang gold polymetallic deposit is located in the eastern section of Bangonghu-Nujiang metallogenic belt.The geotectonic position of the deposit is located in the southern margin of Naqu-Luolong forearc basin.The metallogenic geological background and metallogenic geological conditions are superior.It is a favorable area for searching for gold,silver,copper,and lead-zinc polymetallic deposits.In order to preliminarily understand the prospect of mineral resources in the area,a section with large mineralization potential is proposed.The technical method combination of 1∶10000 soil survey,1∶10000 geological mapping,remote sensing geological interpretation,induced polarization sounding,and engineering verification is adopted to conduct a preliminary evaluation of the mining area.Nine gold ore bodies,three gold and silver ore bodies,and four copper ore bodies are found.The genetic type of the deposit is preliminarily determined to be porphyry epithermal hydrothermal type.The ore-forming rock body is a concealed body of biotite monzonite granite porphyry.On this basis,through the comprehensive study of the geological characteristics,geophysical and geochemical anomaly characteristics,and remote sensing image characteristics of the deposit,the prospecting indicators of the deposit are systematically summarized,and three prospecting target areas with great mineralization potential are delineated,which provides a basis for subsequent exploration work deployment.The research results also have important reference and enlightenment significance for regional prospecting in the eastern section of the Bangonghu-Nujiang metallogenic belt.