Inverse Least-Squares Modeling of Induced Polarization and Resistivity Data to Explore Copper Deposits in the Sarbisheh Ophiolites, Iran
Adnan Sharafi1, Hamid Sarkheil2, Mohammad Kazem Hafizi3
1Adnan Sharafi, Islamic Azad University, North Tehran Branch, Tehran, Iran.
2Hamid Sarkheil, Department of Environmental Engineering, University of Environment, Karaj, Iran.
3Mohammad-Kazem Hafizi, Institute of Geophysics, University of Tehran, Tehran, Iran.
Manuscript received on November 15, 2014. | Revised Manuscript received on November 18, 2014. | Manuscript published on November 25, 2014. | PP:11-14 | Volume-3 Issue-1, November 2014. | Retrieval Number: L08261021214/2014©BEIESP
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© The Authors. Published By: Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: Since the resistivity and induced polarization, methods have an important role for exploration of copper mineralization. Kuh Kheyri area is located south of Sarbisheh in south Khorasan province. This area is located in sheet 1:250000 of Brijand and 1:100000 Sahlabad. The existence of volcanic rocks like Andesite, and the metallic mineralization with small to large sizes in this type of rocks, has made this area quite remarkable of having mining potential. Since surface exploration, methods like geology and geochemistry are not solely capable of determination of depth, direction and dip of mineralization, the geophysical methods can be effective. By taking into consideration the physical changes of existing rocks in the area and also the sulfide mineralization in it, the Induced polarization and resistivity method was used for determination of those areas having low resistivity, and high induced polarization was carries out to distinguish the anomaly zones. The array was used is Dipole-Dipole with 40 meters electrode spacing and 20 meters bond spacing. Four pseudo sections with 100 meters distance of each other as parallel and also two perpendicularly pseudo sections with 50 meters distance from each other are designed and carried out. The total 1218 Induced polarization and electrical resistivity points was measured. The pseudo section of IP and RS was measured and least-squares inversion modeling sections with topographic correction was done with Res2dinv software and then the results was explained and analyzed. The studies has shown that according to surface geological evidences compared with induced polarization sections and resistivity, the maximum amount of chargeability in 3sections with minimum resistivity have good relative accordance and in the other 3 sections, the resistivity is high probably due to the open spaces or silicification of mineralizes zones in this 3 sections, causing the increase of resistivity. In general, according to surface geological and geophysical results, this area has a very good potential for copper mineralization.
Keywords: Copper, Induced Polarization, Least-Squares Inversion, Resistivity, Kuh Khayri.