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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Weighted drainage catchment basin mapping of geochemical anomalies using stream sediment data for mineral potential modeling
Journal of Geochemical Exploration, Volume 128, Year 2013
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Description
In stream sediment geochemical exploration, anomalies can be recognized by 'undiluting' concentrations of indicator elements in every stream sediment sample catchment basin (SCB) as a function of topographic, geomorphologic, and geologic factors. However, this SCB modeling, like contour mapping, of stream sediment geochemical anomalies depends on sampling locations and sampling density. These arbitrary aspects of stream sediment sampling can render SCB or contour mapping of stream sediment anomalies inefficient. In this paper, instead of evaluating the relative exploration importance of each sample per SCB, we evaluated the relative exploration importance of samples per natural drainage catchment basin (DCB). Accordingly, we developed a new fuzzy weighting scheme for each DCB based on the distribution of anomalous and background samples in each DCB. In this new approach of weighted drainage catchment basin (WDCB) mapping of stream sediment geochemical anomalies, individual DCBs are given fuzzy weights representing their relative importance for prospecting the deposit-type sought. Hence, a map of WDCB can be used directly as a geochemical evidence layer in fuzzy-based mineral prospectivity mapping. In this regard, we demonstrated that the prediction rate of prospectivity map obtained by using WDCB approach with respect to known mineral deposit occurrences is higher than that of prospectivity map obtained by using a SCB or contour map. © 2013 Elsevier B.V.
Authors & Co-Authors
Yousefi, Mahyar
Iran, Shahrood
Shahrood University of Technology
Carranza, Emmanuel John M.
Netherlands, Enschede
Faculty of Geo-information Science and Earth Observation – Itc
Statistics
Citations: 103
Authors: 2
Affiliations: 2
Identifiers
Doi:
10.1016/j.gexplo.2013.01.013
ISSN:
03756742