Geochemical reconnaissance survey and environmental assessment for stream sediments of Wadi Um Gier,Southeastern Desert,Egypt |
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| Authors: | Mohamed Abdallah Gad Darwish |
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| Institution: | (1) Geology Department, Aswan Faculty of Science, South Valley University, Aswan, 81528, Egypt |
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| Abstract: | The purposes of this study were to assess the influence of old mining activities on the geochemistry and quality of sediments
and to identify the sites of economic elements. Thirty sites of stream sediment were sampled in the study area covered by
granitic, metarhyodacitic and meta-andesitic rocks and related tuffs-hosted abandoned Au mine. The suite of chemical elements,
Ag, Bi, Cd, Cu, Fe, Ga, Hg, Mn, Nb, Pb, Rb, Sb, Se, Sn, Te, Th, U, Y, Zn and Zr, pH value and total organic carbon were determined,
and univariate, bivariate and multivariate statistical methods were applied. The results show that the enrichment factor (EF)
is very high in the case of Te and significant also with respect to Ag, Bi, Cu, Sb, Se, Sn and Zn. Likewise, geoaccumulation
indices (Igeos) varied from very highly polluted with Sn and Te, strongly to very strongly polluted with Bi and Se, and moderately
polluted with Sb. The polluted sites of Ag, Bi, Sb, Se, Sn and Te were outlined using Igeos maps, and economic sites of Ag
and Sn were identified by geochemical maps leading to their sources, which are likely to be mining activities and lithogenic
processes. The pollutant elements may cause toxicity in stream sediments, or surface or underground water, as well as plants
and animals in the area. This investigation provides an environmental baseline for future monitoring of possible human/anthropogenic,
industrial and agricultural impacts on the study area and considers an attempt at re-mining Ag and Sn. |
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