嵩县何家村金矿床隐伏矿体定位技术研究

Technology to Locate Hidden Ore Bodies in the Hejiacun Au Deposit,Song County,Henan province

河南省嵩县何家村金矿床为赋存于熊耳群安山岩中的构造蚀变带。为了进一步探测隐伏矿体,开展了矿床地质、地球化学研究以及高频大地电磁测深剖面分析。矿体沿含金蚀变带产出,金品位为0.12g/t^4.0 g/t。金属矿物有自然金、黄铁矿、方铅矿、深红银矿、黄铜矿和少量自然铁,矿石结构主要有结晶结构、交代结构,矿石构造主要有脉状构造、团块状构造和浸染状构造,围岩蚀变常见黄铁矿化、硅化、钾长石化。在地球化学金异常区域内,通过高频大地电磁测深剖面缩小矿区存在的隐伏岩浆-热液活动范围,并且沿剖面进行岩石地球化学测量分析,进而客观评价Au异常。物探和化探数据显示的信息具有吻合性,暗示矿区沿次级断裂附近的深部可能存在较大矿体,为矿区下一步地质勘查工作提供了重要的找矿线索。

The Hejiacun Au deposit lies in tectonic alteration zone of Xionger Group. Studies of geology, geochemistry, and high-frequency magnetotelluric sounding have been made to explore hidden ore bodies in this area. The research reveals that ore bodies occur along the gold bearing alteration with the gold grade between 0. 12g/t-4.0g/t. Native gold, pyrite, galena, pyrargyrite, chalcopyrite and small amount of natural iron are the major metallic minerals. Crystal structure and metasomatie texture comprise the ores micro texture, vein texture, crumb structure, and pyritization, siliconization and pot- ash feldspathization appear in the wall rock alterations. To narrow the range of hidden magmatic fluid activity in the gold geochemical anomaly area, high frequency magnetotclluric sounding is conducted, and geochemical survey along the cross-section is made. And evaluation of the Au anomalies is per- formed. Geophysical and geochemical data are well consistent, and show that a hidden large ore body may be present in deep strata near the secondary faults. This conclusion provides an important clue for next step of prospecting in this area.