Open AccessIce‐marginal debris‐flow deposits in western Allgau, southern West Germany
Author(s) -
JONG MAT G.G. DE,
RAPPOL MARTIN
Publication year - 1983
Publication title -
boreas
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.95
H-Index - 74
eISSN - 1502-3885
pISSN - 0300-9483
DOI - 10.1111/j.1502-3885.1983.tb00360.x
Subject(s) - geology , debris flow , debris , meltwater , geomorphology , hyperconcentrated flow , glacier , mudflow , foreland basin , graded bedding , geochemistry , ice stream , clastic rock , sediment , structural basin , sediment transport , oceanography , cryosphere , bed load , sea ice
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.