1887

Abstract

The paper discusses the results of investigation into fast-decaying induced polariza-tion of frozen rocks forming the near-surface geology of the Mirny kimberlite field in Yakutiya, Russia. Time domain galvanic IP response was measured in the range from 0.1 to 12.8 ms in combined sounding and profiling mode with the pole-dipole array. The measurements were carried out along surveying lines going over and in the vicin-ity of a known kimberlite pipe embedded in carbonate rock. Measured data were transformed into apparent resistivity, chargeability, and the rate of decay of the IP response. As indicate the survey results, frozen carbonate rocks exhibit high resistiv-ity, chargeability and rate of the IP decay. Such combination of parameters is typical of frozen ion-conductive rocks containing no electron-conductive minerals. As for the known kimberlite pipe, in comparison with the host rock it is marked by low resistiv-ity, chargeability and rate of the IP decay. The IP survey resulted in discovering two anomalous objects the parameters of which differ from those typical of carbonate rocks. The combinations of these parameters suggest that one of the above objects might be an unknown kimberlite body whereas the other presents an area with en-hanced concentration of sulfide minerals

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/content/papers/10.3997/2214-4609.20146881
2008-04-07
2020-10-27
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