Abstract
The IP measurement has a low background value above which IP data can be called anomalous, yielding a more definitive interpretation than other geophysical methods. For resolving IP sources, broad band IP data should be collected. The most cost effective way to obtain enough spectral IP (SIP) information routinely is by time-domain SIP measurement. Although the Cole-Cole parameters (chargeability M, time const T and exponent c) have been found to be very useful in resolving SIP sources in a frequency-domain, these parameters can also be determined through computer matching of the time-domain SIP data by the best fit in a family of pre-calculated Cole-Cole curves. Time-domain SIP has first been applied to the southern Chinkushih area, northern Taiwan, for the resolution of SIP sources. Based on the time domain SIP analysis, possible concealed porphyry gold/copper deposits, or breccia pipes in the margin of the Wutanshan intrusion were located.
Highlights
Induced polarization (IP) is a current-stimulated electrical phenomenon observed as de layed voltage response in the earth materials (Sumner 1976)
The primary advantage of the IP method is its capability under favorable conditions to detect the presence of even very small amounts of metallic minerals, such as disseminated mineralization, where other geophysical exploration methods are much less effective in this regard
It may be seen that there are four strong and distinct chargeability zones (10 times background value 2%), lying at some depth 50 m below surface, i.e., under 200, 500, 1100, and 1300 m, indicated by A, B, C, and D, respectively, on this traverse. Each of these IP anomalous zones is marked by major resistivity changes (Fig. 7b); the general resistivity anomaly levels lie in the range of 300-400 ohm-m, against a background resistivity of less than 100 ohm-m
Summary
Induced polarization (IP) is a current-stimulated electrical phenomenon observed as de layed voltage response in the earth materials (Sumner 1976). The primary advantage of the IP method is its capability under favorable conditions to detect the presence of even very small amounts of metallic minerals, such as disseminated mineralization, where other geophysical exploration methods are much less effective in this regard. As a first step towards understanding the IP method, a tank model experiment of IP across an ore body of different grain sizes has been conducted. Figure l shows the tank model set up for IP modeling. The model tank consists of a PVC tank (60 cm by 50 cm by 45 cm). The tank was filled with water and sponge whose electrical conductivity could be adjusted by adding
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