Ice‐marginal debris‐flow deposits in western Allgau, southern West Germany
作者:
MAT G.G. DE JONG,
MARTIN RAPPOL,
期刊:
Boreas
(WILEY Available online 1983)
卷期:
Volume 12,
issue 1
页码: 57-70
ISSN:0300-9483
年代: 1983
DOI:10.1111/j.1502-3885.1983.tb00360.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
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 ca
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