Till geochemistry in the ribbed moraine area of Peräpohjola,Finland |
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| Institution: | 1. Earth and Environmental Systems Institute and Department of Geosciences, The Pennsylvania State University, University Park, PA 16802, USA;2. Department of Earth Sciences, Dickinson College, Carlisle, PA 17013, USA;3. Department of Geological Sciences, University of Texas at El Paso, El Paso, TX 79968, USA;1. Department of Earth and Atmospheric Sciences, University of Houston, Houston, TX 77204, USA;2. College of Marine Science, University of South Florida, St. Petersburg, FL 33701, USA;3. CESAM/Department of Geosciences, University of Aveiro, Aveiro 3810-193, Portugal;4. Korea Polar Research Institute, Incheon 406-840, South Korea;1. Department of Geography, Durham University, South Road, Durham, UK;2. Department of Geography, Liverpool John Moores University, Byrom Street, Liverpool L3 3AF, UK;3. Geography and Environment, School of Geosciences, University of Aberdeen, Meston Building, Old Aberdeen, AB24 3UE, UK;4. Department of Geography, University of Zurich-Irchel, Winterthurerstr. 190, CH-8057 Zurich, Switzerland |
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| Abstract: | The characteristics of ribbed moraines, with an emphasis on till geochemical prospecting, were studied in the area of Peräpohjola, southern Finnish Lapland. Percussion drilling, test pits and trenches were used for till sampling. The samples were partially extracted and then analysed using ICP-AES or GFAAS methods in the geolaboratory of the Geological Survey of Finland. The distribution of Au and Cu in fine fraction (<0.06 mm) of till in both horizontal and vertical dimensions showed that the uppermost part of the moraine ridges contained the highest metal contents. In the coarser fractions of till (0.06–0.5 and >2 mm), the anomalies were located on the distal side of the ribbed moraine ridges, down-ice from mineralized bedrock. Geochemical patterns together with fresh pyrite grains in till heavy mineral concentrates indicate a short glacial transport distance of the mineralized debris. This conclusion is also supported by the presence of a large proportion of local rock fragments and boulders in the uppermost till unit and at the surface, which is a result of glacial quarrying during the ribbed moraine formation. |
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