The true sample catchment basin approach in the analysis of stream sediment geochemical data |
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| Institution: | 1. Faculty of Mining and Metallurgical Engineering, Amirkabir University of Technology, Tehran, Iran;2. Faculty of Engineering, Malayer University, Malayer, Iran;3. Mineral Resource Department, Geological Survey of Sweden, Uppsala, Sweden;1. Faculty of Engineering, University of Mohaghegh Ardabili, Ardabil, Iran;2. Geochemistry, Department of Mining Engineering, University of Gonabad, Gonabad, Iran;1. Department of Science and Technology, University of Sannio, 82100 Benevento, Italy;2. Department of Earth, Environmental and Resources Sciences, University of Naples Federico II, 80126 Naples, Italy;3. ENI S.p.A., Viggiano, 85059 Potenza, Italy |
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| Abstract: | The Sample Catchment Basin Approach (SCBA) is one of the techniques widely employed in the analysis of stream sediment geochemical data and delineation of anomalous catchments. However, this method fails to take into account the real catchment basin boundaries of each sample by incorporating only the incremental area between two adjacent samples. In other words, the SCBA incorrectly assumes that the geochemistry of every sample catchment within a drainage is independent from upstream sample catchment(s) feeding into this drainage. The chemical composition of sediment at the basin outlet originates from the whole basin upstream and not the incremental area as postulated in the SCBA. Consequently, the calculated background values for various lithologies and the background value for the element of interest at the basin outlet might be far from reality.This study used a True Sample Catchment Basin Approach (TSCBA), that reflects the true catchment boundary of every stream sediment sample, and in which all calculations are carried out on the premise that this boundary and the true area affect the composition of each sample. The results obtained from the application of both the SCBA and TSCBA to a gold endowed study area in western Iran clearly illustrated the superiority of the TSCBA over the SCBA. In addition, this study demonstrated the advantage of using the modified dilution correction equation of Mokhtari and Garousi Nezhad (2015), as compared to the existing Hawkes’s equation commonly used for dilution correction of residual values. |
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| Keywords: | True Sample Catchment Basin Approach Stream sediment Modified dilution equation Gold Iran |
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