Ice-marginal debris-flow deposits in western Allgau, southern West Germany |
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| Authors: | MAT GG DE JONG MARTIN RAPPOL |
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| Institution: | Laboratory for Physical Geography and Soil Science, University of Amsterdam, Dapperstraat 115, 1093 BS Amsterdam, The Netherlands |
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| Abstract: | Ice-marginal debris-flow deposits (comparable to deposits elsewhere described as flow tills) are described from glacier-proximal sediments in an Alpine foreland area. Debris-flow deposits are characteristically interstratified with subaeric or subaquatie meltwater deposits, and occur in a wide variety of geomorpho-logical settings. The granulomctric composition of debris-flow deposits is more variable than that of subglacial tills. Within-flow variability may occur as a result of the formation of graded bedding, lateral as well as vertical. Clast fabrics show both random and preferred orientations; unequivocal interpretation of these is not possible. Debris-flow deposits are composed of material derived from various sources: sources from subglaeially-derived debris as well as from previously deposited tills and walerlain sediments can be demonstrated. |
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