综合地球物理方法在某金多金属矿区找矿中的应用

Application of comprehensive geophysical methods in ore prospecting in one Au polymetallic mineralizing area

某金多金属矿区地表矿化痕迹较多,矿化体和围岩物性差异明显,为了准确查明区内矿体的空间分布以及控矿构造,在该区实施了对称四极装置的激电扫面和EH4连续电导率测深工作.激电测量获得了总体呈NE走向、与地表矿带对应的中高视电阻率(ρ_s)及中高视极化率(η_s)矿化异常带.异常带西窄东宽,矿化集中在测区327°向测线800～1350m处;在与已知矿体对应的η_s-2高极化率激电异常开展的EH4测深工作结果进一步确定了深部成矿潜力:含矿构造延深可达500m,具有低阻异常特征,倾角近直立.激电扫面和EH4测深相结合的综合物探方法在该区达到了查明矿体分布规律、控矿构造的目的,是有效的多金属矿找矿方法之一.

Based on the surface geological and physical property measurement work in detail, we have found many surface mineralization traces in one Au and polymetallic mineralization area, and the physical properties differences between mineralized bodies and wall rocks were evident. To ascertain the spatial distribution and controlling structures of ore bodies, we have carried out IP symmetrical quadrupole survey and EH4 electromagnetic measurement in this area. IP survey result shows that mineralization abnormality belt is NE-trending, with middle- high ρs and ηs, and mineralization center is located at 800- 1350 m of the 327° orientation measuring line, which is much narrow in west than east. EH4 electromagnetic sounding, used in ηs-2 （with high ηs and corresponding to known orebody）, for further exploration of deep mineralizing perspective： depth of ore-bearing structure is 500m, characterized by low ρs and sub-vertical dip. Hence, the combination of IP survey and EH4 electromagnetic measurement have reached the target of finding out the regularities of ore body distribution and ore-controlling structures in this area, and they are effective polymetallic prospecting methods.