Ice sheet erosion patterns in valley systems in northern Sweden investigated using cosmogenic nuclides

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dc.contributor.authorLi, YKen_AU
dc.contributor.authorHarbor, Jen_AU
dc.contributor.authorStroeven, APen_AU
dc.contributor.authorFabel, Den_AU
dc.contributor.authorKleman, Jen_AU
dc.contributor.authorFink, Den_AU
dc.contributor.authorCaffee, Men_AU
dc.contributor.authorElmore, Den_AU
dc.date.accessioned2021-12-16T00:23:18Zen_AU
dc.date.available2021-12-16T00:23:18Zen_AU
dc.date.issued2005-08-30en_AU
dc.date.statistics2021-11-08en_AU
dc.descriptionSpecial Issue: Quantifying Rates and Timescales of Geomorphic Processes: Part 1,en_AU
dc.description.abstractErosion patterns associated with glaciation of trunk and hanging valley systems in northern Sweden were investigated using cosmogenic nuclide 10Be apparent exposure ages and inferred nuclide inheritance. Sequences of samples taken across valleys known to have been covered repeatedly by the Fennoscandian ice sheet revealed two primary patterns of erosion. In Vávlávágge the exposure age pattern is consistent with >2 m of glacial erosion during the last glacial cycle along the entire profile. At Rávtasvággi, Dievssavággi and Alisvággi, exposure ages in the valley bottom contrast with apparent exposure ages two to four times older on the valley sides. The older ages on the valley sides reflect cosmogenic nuclide inheritance due to limited (<2 m) bedrock erosion of the valley sides during the last glacial cycle. The pattern and scale of erosion in these valleys indicates that glacial valley formation is a result of multiple glacial cycles rather than the result of topographic modification during a single glacial cycle. Initial data comparing hanging valley and trunk valley sites do not show distinct differences in apparent exposure ages. Slightly older ages for samples from hanging valley bottoms may suggest nuclide inheritance indicating lower erosion than in trunk valley bottoms, as would be expected given the marked topographic step between hanging and trunk valleys. Although quantifying the amount of erosion depends on the assumed cosmogenic nuclide inheritance prior to the onset of erosion, the pattern of erosion is independent of this. Hence the observed pattern of cosmogenic nuclide concentrations provides constraints on spatial patterns of erosion and helps to refine understanding of the timing and extent of landform modification by glaciation. Copyright © 2005 John Wiley & Sons, Ltd.en_AU
dc.identifier.citationLi, Y., Harbor, J., Stroeven, A. P., Fabel, D., Kleman, J., Fink, D., Caffee, M., & Elmore, D. (2005). Ice sheet erosion patterns in valley systems in northern Sweden investigated using cosmogenic nuclides. Earth Surface Processes and Landforms, 30(8),1039-1049. doi:10.1002/esp.1261en_AU
dc.identifier.issn1096-9837en_AU
dc.identifier.issue8en_AU
dc.identifier.journaltitleEarth Surface Processes and Landformsen_AU
dc.identifier.pagination1039-1049en_AU
dc.identifier.urihttps://doi.org/10.1002/esp.1261en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12468en_AU
dc.identifier.volume30en_AU
dc.language.isoenen_AU
dc.publisherWileyen_AU
dc.subjectSwedenen_AU
dc.subjectErosionen_AU
dc.subjectIceen_AU
dc.subjectTopographyen_AU
dc.subjectGeomorphologyen_AU
dc.subjectGlaciersen_AU
dc.titleIce sheet erosion patterns in valley systems in northern Sweden investigated using cosmogenic nuclidesen_AU
dc.typeJournal Articleen_AU
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