大功率激发极化和音频大地电磁联合方法在额尔古纳成矿带寻找隐伏矿的应用研究

APPLICATION OF AUDIO MAGNETOTELLURICS AND HIGH-POWER INDUCED POLARIZATION FOR CONCEALED ORES IN THE EERGUNA METALLOGENIC BELT

为了在额尔古纳成矿带南段某地开展隐伏矿找矿工作,应用了音频大地电磁和大功率激发极化联合方法进行找矿研究。两种方法为基于不同原理的地球物理勘探手段,在地球物理勘探中发挥不同的作用。激发极化中梯装置一般用于矿区及外围的地球物理扫面,以快速确定和发现矿化构造系统的空间展布和基本规模。音频大地电磁作为一种对地下地质结构解析度高、有效探测深度适中(800～1200m)的地球物理测深方法,可以解析较为精确的探测矿体的三维形态、规模、产状变化和细部结构。联合这两种方法,既保证了找矿效果、效率,又降低成本。

In order to explore concealed ores in the south section of Eerguna metallogenic belt, geophysical exploration methods such as combination of audio magnetotelluries prospecting and induced polarization （IP） are used. Audio magnetotellurics prospecting belongs to electromagnetic survey meth- ods and induced polarization belongs to direct current methods. These two methods can achieve difference purpose in geophysical exploration. Induced polarization is typically utilized as a routine geophysical survey to, fast and effectively, detect and delineate near - surface extensions and general sizes of ore - controlling structures in a relatively large area. EH4 system is, up to date, the most effective electromagnetic method for metalliferous mineral explorations with high detecting resolution and appropriate depths of penetration （800 - 1200 m）. It is frequently used to investigate the spatial variations, si- zes, detailed geometries of orebodies in mineralized alteration zones. The combination of audio magnetotellurics and IP had achieved a pretty good result.