Water sheet outburst floods from the Laurentide Ice Sheet

Autor:	E. M. Shoemaker
Rok vydání:	1992
Předmět:	Ice-sheet model geography geography.geographical_feature_category Shelf ice Ice stream Ice tongue Wisconsin glaciation Subglacial lake General Earth and Planetary Sciences Ice sheet Geomorphology Ice shelf Geology
Zdroj:	Canadian Journal of Earth Sciences. 29:1250-1264
ISSN:	1480-3313 0008-4077
DOI:	10.1139/e92-100
Popis:	Field evidence and a theoretical model support the concept that during Wisconsinan glaciation subglacial water sheet outburst floods issued from a large subglacial lake located in the Hudson Bay basin. The lake was fed by supraglacier meltwater that was trapped in a depressed ice lid over the lake. Water may have also fed the lake by reversed outburst floods from proglacial lakes, particularly after 9000 BP, when a very low ice elevation over Hudson Bay is calculated. Deglaciation was accelerated by surges associated with the lift-off of ice by the sheet floods; ice lobe extensions the order of 100 km are possible. The model supports the concept of a multidomed Laurentide Ice Sheet in the form of an annular dome around Hudson Bay.
Databáze:	OpenAIRE
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