gis modelling for au-pb-zn potential mapping in torud-chah shirin area-iran

one of the major strengths of a geographic information system (gis) in geosciences is the ability to integrate and combine multiple layers into mineral potential maps showing areas which are favorable for mineral exploration. these capabilities make gis an extremely useful tool for mineral exploration. several spatial modeling techniques can be employed to produce potential maps. however, these methods can be divided into knowledge -and data-driven techniques. the goal of this study is to use gis in mapping gold deposit potentials in torud-chah shiran area. after collecting relevant exploration data and defining appropriate exploration model for the mineralization zone, several layers including proved mineralization map, geological map, remote sensing derived, alteration map, geochemical and aeromagnetic maps were imported in to gis environment. for integrated exploration modeling, two methods were used: fuzzy logic and weight of evidence methods. finally, the results of the two methods were compared. the result of each method had statistical problems but these problems were alleviated using the map of differences that was in a good agreement with reality.