Application of geochemical zonality coefficients in mineral prospectivity mapping

Ziaii, Mansour, Carranza, Emmanuel John M., and Ziaei, Mahdi (2011) Application of geochemical zonality coefficients in mineral prospectivity mapping. Computers & Geosciences, 37 (12). pp. 1935-1945.

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Abstract

Indices of geochemical zonality (Vz) of multielements around mineral deposits and their spatial associations with particular geological, geochemical, and structural factors are critical aspects that must be considered in mineral exploration. Values of Vz indices allow distinction between sub-ore and supra-ore anomalies, which are associated with outcropping and blind deposits, respectively. In this paper, we used a map of a Vz index (Zn*Pb/Cu*Ag) in weights-of-evidence analysis of regional-scale prospectivity for porphyry–Cu deposits in the area covered by 1:100,000 scale map sheet of Jebal-Barez (Kerman province, southern Iran). For comparison, we used a Cu map instead of the Vz map in the weights-of-evidence (WofE) analysis. The Vz-in-WofE prospectivity model outperforms the Cu-in-WofE prospectivity model. In fact, prior to writing this paper, blind porphyry–Cu mineralization was intersected at depth by borehole exploration in a high prospectivity zone delineated by the Vz-in-WofE model. The results demonstrate the usefulness of the Vz-in-WofE for regional-scale targeting of blind mineral deposits.

Item ID: 27332
Item Type: Article (Research - C1)
ISSN: 1873-7803
Keywords: geochemical zonality; sub-ore anomaly; supra-ore anomaly; weights of evidence; GIS; Jebal-Barez
Date Deposited: 31 May 2013 06:00
FoR Codes: 04 EARTH SCIENCES > 0402 Geochemistry > 040201 Exploration Geochemistry @ 50%
01 MATHEMATICAL SCIENCES > 0103 Numerical and Computational Mathematics > 010399 Numerical and Computational Mathematics not elsewhere classified @ 50%
SEO Codes: 84 MINERAL RESOURCES (excl. Energy Resources) > 8401 Mineral Exploration > 840199 Mineral Exploration not elsewhere classified @ 100%
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