Landscape preservation under Fennoscandian ice sheets determined from in situ produced 10Be and 26Al

Simple item page
dc.contributor.authorFabel, Den_AU
dc.contributor.authorStroeven, APen_AU
dc.contributor.authorHarbor, Jen_AU
dc.contributor.authorKleman, Jen_AU
dc.contributor.authorElmore, Den_AU
dc.contributor.authorFink, Den_AU
dc.date.accessioned2021-12-15T23:43:18Zen_AU
dc.date.available2021-12-15T23:43:18Zen_AU
dc.date.issued2002-07-30en_AU
dc.date.statistics2021-11-04en_AU
dc.description.abstractSome areas within ice sheet boundaries retain pre-existing landforms and thus either remained as ice free islands (nunataks) during glaciation, or were preserved under ice. Differentiating between these alternatives has significant implications for paleoenvironment, ice sheet surface elevation, and ice volume reconstructions. In the northern Swedish mountains, in situ cosmogenic 10Be and 26Al concentrations from glacial erratics on relict surfaces as well as glacially eroded bedrock adjacent to these surfaces, provide consistent last deglaciation exposure ages (∼8–13 kyr), confirming ice sheet overriding as opposed to ice free conditions. However, these ages contrast with exposure ages of 34–61 kyr on bedrock surfaces in these same relict areas, demonstrating that relict areas were preserved with little erosion through multiple glacial cycles. Based on the difference in radioactive decay between 26Al and 10Be, the measured nuclide concentration in one of these bedrock surfaces suggests that it remained largely unmodified for a minimum period of 845−418+461 kyr. These results indicate that relict areas need to be accounted for as frozen bed patches in basal boundary conditions for ice sheet models, and in landscape development models. Subglacial preservation also implies that source areas for glacial sediments in ocean cores are considerably smaller than the total area covered by ice sheets. These relict areas also have significance as potential long-term subglacial biologic refugia. © 2002 Elsevier Science B.V.en_AU
dc.identifier.citationFabel, D., Stroeven, A. P., Harbor, J., Kleman, J., Elmore, D., Fink, D. (2002). Landscape preservation under Fennoscandian ice sheets determined from in situ produced 10Be and 26Al. Earth and Planetary Science Letters, 201(2), 397-406. doi:10.1016/S0012-821X(02)00714-8en_AU
dc.identifier.issn0012-821Xen_AU
dc.identifier.issue2en_AU
dc.identifier.journaltitleEarth and Planetary Science Lettersen_AU
dc.identifier.pagination397-406en_AU
dc.identifier.urihttps://doi.org/10.1016/S0012-821X(02)00714-8en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12461en_AU
dc.identifier.volume201en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectSwedenen_AU
dc.subjectIceen_AU
dc.subjectErosionen_AU
dc.subjectGeomorphologyen_AU
dc.subjectSedimentsen_AU
dc.subjectBerylliumen_AU
dc.subjectAluminiumen_AU
dc.subjectDecayen_AU
dc.titleLandscape preservation under Fennoscandian ice sheets determined from in situ produced 10Be and 26Alen_AU
dc.typeJournal Articleen_AU
Files
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
1.63 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Journal Articles