Comparison of stream sediment and soil sampling for regional exploration in the eastern Alps,Austria |
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| Institution: | 1. Agronomy Department, Federal University of Piaui (UFPI), Planalto horizonte, 64900-000 Bom Jesus, PI, Brazil;2. Agronomy Department, Federal Rural University of Pernambuco (UFRPE), Dom Manuel de Medeiros street, s/n - Dois Irmãos, 52171-900 Recife, PE, Brazil;3. Biological and Agricultural Engineering Department, Zachry Department of Civil Engineering, Texas A&M University, College Station, TX 77843-2117, USA;4. Rural Technology Department, Federal Rural University of Pernambuco (UFRPE), Dom Manuel de Medeiros street, s/n - Dois Irmãos, 52171-900 Recife, PE, Brazil |
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| Abstract: | Tests in three different areas of the Austrian Alps showed that in mountainous areas, soil samples taken at the break of slope are an alternative sampling medium to stream sediments for regional geochemical exploration even if taken at the unusually low density of 1 sample/km2. B-horizon soil samples from the nearest break of slope were collected in conjunction with stream sediment orientation studies. The minus 0.2 mm fraction of all samples was routinely analyzed for the total contents of 36 elements. The results for the indicator elements in the three test areas (Area 1: Cu; Area 2: Ag, As, Cu, Pb, Sb, Sn, Zn; Area 3: As, Cu) showed that break-of-slope soil samples more clearly indicate known mineralization than drainage geochemistry. In the soils, almost all elements showed a higher natural variability of the data with considerably higher metal contents. In mountaineous regions, each soil sample will have a clearly defined area of influence. The break of slope represents a site where clastically and hydromorphically dispersed elements are concentrated. It is concluded that soil samples can be used for regional exploration using low sampling densities in mountaineous areas. At the same time they will provide valuable information for other fields of science (e.g. agriculture, forestry, environmental sciences) and are thus superior to stream sediments. |
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