RAPID METHODS FOR INTERPRETATION OF INDUCED POLARIZATION ANOMALIES

The induced polarization (IP) method is used at various stages of pros pecting in poorly accessible regions that have complex structure. For such conditions we suggest approximate procedures for acquiring inform ation about the location of the structures in question. Correlation be tween the observed fields and the heights of observation points is use d for reducing the effect of terrain relief. Simultaneously, the probl em of revealing an anomalous body is qualitatively solved. The qualita tive construction of pseudosections of apparent polarizability eta(a) and semi-quantitative determination of the depth of a polarized bed us ing vertical sounding allow us to obtain information about the ore pot ential of a region as a whole and the location of ore deposits specifi cally. We demonstrate common aspects of typical models (thin and thick beds, horizontal circular cylinder) with models used in magnetic pros pecting. On this basis it is suggested that one should apply quantitat ive methods of magnetic anomaly interpretation in the cases of rugged topography, oblique magnetization (polarization) and unknown levels of the normal field for rapid inversion of eta(a) anomalies. These rapid methods (improved modifications of characteristic point and tangent m ethods) are successfully tested both on models and in actual prospecti ng and investigation of a karst terrain.