Cosmogenic nuclide evidence for minimal erosion across two subglacial sliding boundaries of the late glacial Fennoscandian ice sheet

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dc.contributor.authorHarbor, Jen_AU
dc.contributor.authorStroeven, APen_AU
dc.contributor.authorFabel, Den_AU
dc.contributor.authorClarhäll, Aen_AU
dc.contributor.authorKleman, Jen_AU
dc.contributor.authorLi, YKen_AU
dc.contributor.authorElmore, Den_AU
dc.contributor.authorFink, Den_AU
dc.date.accessioned2021-12-16T00:55:07Zen_AU
dc.date.available2021-12-16T00:55:07Zen_AU
dc.date.issued2006-04en_AU
dc.date.statistics2021-11-09en_AU
dc.description.abstractThe existence of sliding and frozen bed areas under ice sheets is significant in understanding basal thermal regimes, patterns of erosion and landform development, and in constraining boundary conditions for the reconstructions of ice sheets. Recognition of subglacial boundaries between sliding and frozen-bed areas for former ice sheets is typically based on distinct morphological contrasts between areas with glacial landform assemblages and relict areas showing little alteration of pre-existing features. Some of these boundaries, especially on continental shield areas, however, are clearly visible from air photos but have minimal topographic expression. Understanding the chronology and erosional development of such boundaries is important to provide insight into the pattern and persistence of basal conditions under ice sheets. Geomorphic evidence and cosmogenic radionuclide concentrations of bedrock outcrops on either side of two sliding boundaries on Ultevis and Arvestuottar, low-relief upland plateaus in northern Sweden, are consistent with negligible erosion in relict landscape (frozen bed) areas due to the last glaciation, but also indicate insignificant erosion in the sliding areas. Such a pattern and magnitude of landscape modification indicates that sliding was short lived in these areas, likely as a transient phase during deglaciation. These sites demonstrate that short periods of sliding are in some cases sufficient to produce landscapes that are recognized as ‘glacial’ from air photos. Thus, regions of sliding identified on shield areas must be viewed as the cumulative total area that has experienced sliding at any time during a glaciation. The actual extent of sliding areas during any single ice sheet phase is presumably considerably less than this cumulative total, which has important implications for establishing appropriate basal boundary conditions for ice sheet reconstructions.© 2005 Elsevier B.V.en_AU
dc.identifier.citationHarbor, J., Stroeven, A. P., Fabel, D., Clarhäll, A., Kleman, J., Li, Y., Elmore, D., & Fink, D. (2006). Cosmogenic nuclide evidence for minimal erosion across two subglacial sliding boundaries of the late glacial Fennoscandian ice sheet. Geomorphology, 75(1–2), 90-99, doi:org/10.1016/j.geomorph.2004.09.036en_AU
dc.identifier.issn0169-555Xen_AU
dc.identifier.issue1-2en_AU
dc.identifier.journaltitleGeomorphologyen_AU
dc.identifier.pagination90-99en_AU
dc.identifier.urihttps://doi.org/10.1016/j.geomorph.2004.09.036en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12469en_AU
dc.identifier.volume75en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectGlaciersen_AU
dc.subjectErosionen_AU
dc.subjectIceen_AU
dc.subjectGeomorphologyen_AU
dc.subjectSwedenen_AU
dc.subjectMorphological changesen_AU
dc.titleCosmogenic nuclide evidence for minimal erosion across two subglacial sliding boundaries of the late glacial Fennoscandian ice sheeten_AU
dc.typeJournal Articleen_AU
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