Subaerial terminoglacial fans I: a semi-quantitative sedimentological analysis of the proximal environment |
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Authors: | Zieliński T van Loon AJ |
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Institution: | (1) Department of Earth Sciences, Silesian University, Bedzi ska 60, 41–200 Sosnowiec, Poland;(2) Geocom, PO Box 336, 6860 AH Oosterbeek, the Netherlands |
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Abstract: | Fans formed under subaerial terminoglacial (previously called ice-contact ) conditions have several characteristics that differ from those formed under other conditions. Twenty-five such fans in NE Poland were investigated to model the dominant genetic processes involved. These fans show, as do other types, a proximal, a middle and a distal environment. The present study deals with the proximal environment. The fans date from the last, i.e. Weichselian or Vistulian, glacial. The proximal terminoglacial fan comprises abundant gravelly sediments, resembling the glacial deposits from which they were derived. Three facies, each subdivided into two subfacies, can be distinguished; these are dominated by mass flows, unchannelised flows, and stream (= channelised) flows, respectively. The characteristics of the facies are described and illustrated. It is concluded that the irregular supply of water by the nearby ice masses dominates the sedimentary processes. |
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Keywords: | facies analysis glacial fan Poland Vistulian Weichselian |
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