Complex resistivity of mineral rocks in the context of the generalised effective‐medium theory of the induced polarisation effect |
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| Authors: | Michael S Zhdanov Vlad Burtman Masashi Endo Wei Lin |
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| Affiliation: | 1. Consortium for Electromagnetic Modeling and Inversion (CEMI), The University of Utah, Salt Lake City;2. TechnoImaging, Salt Lake City |
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| Abstract: | This paper develops the generalised effective‐medium theory of induced polarisation for rock models with elliptical grains and applies this theory to studying the complex resistivity of typical mineral rocks. We first demonstrate that the developed generalised effective‐medium theory of induced polarisation model can correctly represent the induced polarisation phenomenon in multiphase artificial rock samples manufactured using pyrite and magnetite particles. We have also collected representative rock samples from the Cu–Au deposit in Mongolia and subjected them to mineralogical analysis using Quantitative Evaluation of Minerals by Scanning Electron Microscopy technology. The electrical properties of the same samples were determined using laboratory complex resistivity measurements. As a result, we have established relationships between the mineral composition of the rocks, determined using Quantitative Evaluation of Minerals by Scanning Electron Microscopy analysis, and the parameters of the generalised effective‐medium theory of induced polarisation model defined from the laboratory measurements of the electrical properties of the rocks. These relationships open the possibility for remote estimation of types of mineralisation and for mineral discrimination using spectral induced polarization data. |
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| Keywords: | Complex resistivity Induced polarisation Mineral rocks Generalised effective‐medium theory |
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