航空VTEM测量系统在多金属矿产勘查中的应用

随着我国矿产勘探程度的深入,找矿突破日益困难,空白区及深部找矿成为突破新方向,勘探对象具有深(埋深较大的隐伏矿)、难(高山峻岭、偏远地区、水体覆盖、沙漠等)、低(规模小、矿化程度低)等特点,对找矿技术提出了更高、更难、更新的要求。以加拿大Geotech公司VTEM为代表的直升机载航空瞬变电磁法测量技术由于其信噪比高、分辨能力强、探测深度大、找矿效果好等优势而得到了应用,核工业航测遥感中心引进了该技术并在国内多个省区成功地应用于多金属矿产勘查。文章依托VTEM在国内的实测资料,研究了接触交代型铅锌矿、构造蚀变型金矿、火山块状硫化物型铜锌矿的航空TEM、航磁异常特征,为国内同类型矿床找矿工作提供方法借鉴。

Application of VTEM system in polymetallic mineral exploration

With the deepening of mineral exploration in China, the prospecting breakthrough is becoming more and more difficult, and the blank area and deep prospecting have become the breakthrough direction. The exploration object is of such characteristics as deep (buried deep concealed ore), difficult (mountains, remote areas, water cover, desert, etc.), low (small , Low degree of mineralization) and so on, which needs higher, more difficult and updated requirements.The helicopter airborne transient electromagnetic method, which is represented by VTEM of Geotech in Canada, has been applied because of its high signal-to-noise ratio, strong resolving power, large depth of exploration and good prospecting effect. ARCN introduced VTEM in 2013, and successfully applied to polymetallic mineral exploration in some provinces of China. Based on the measured data of VTEM in China, this paper studied the ATEM and aeromagnetic abnormal features of contact-type lead-zinc deposits, structural alteration gold deposits and volcanic massive sulfide-type copper-zinc ores. We hope it can work to provide method reference for the same type ore deposits in China