Exposure ages from relict lateral moraines overridden by the Fennoscandian ice sheet

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dc.contributor.authorFabel, Den_AU
dc.contributor.authorFink, Den_AU
dc.contributor.authorFredin, Oen_AU
dc.contributor.authorHarbor, Jen_AU
dc.contributor.authorLand, Men_AU
dc.contributor.authorStroeven, APen_AU
dc.date.accessioned2021-12-21T00:24:48Zen_AU
dc.date.available2021-12-21T00:24:48Zen_AU
dc.date.issued2006-01en_AU
dc.date.statistics2021-11-09en_AU
dc.description.abstractLateral moraines constructed along west to east sloping outlet glaciers from mountain centred, pre-last glacial maximum (LGM) ice fields of limited extent remain largely preserved in the northern Swedish landscape despite overriding by continental ice sheets, most recently during the last glacial. From field evidence, including geomorphological relationships and a detailed weathering profile including a buried soil, we have identified seven such lateral moraines that were overridden by the expansion and growth of the Fennoscandian ice sheet. Cosmogenic 10Be and 26Al exposure ages of 19 boulders from the crests of these moraines, combined with the field evidence, are correlated to episodes of moraine stabilisation, Pleistocene surface weathering, and glacial overriding. The last deglaciation event dominates the exposure ages, with 10Be and 26Al data derived from 15 moraine boulders indicating regional deglaciation 9600 ± 200 yr ago. This is the most robust numerical age for the final deglaciation of the Fennoscandian ice sheet. The older apparent exposure ages of the remaining boulders (14,600–26,400 yr) can be explained by cosmogenic nuclide inheritance from previous exposure of the moraine crests during the last glacial cycle. Their potential exposure history, based on local glacial chronologies, indicates that the current moraine morphologies formed at the latest during marine oxygen isotope stage 5. Although numerous deglaciation ages were obtained, this study demonstrates that numerical ages need to be treated with caution and assessed in light of the geomorphological evidence indicating moraines are not necessarily formed by the event that dominates the cosmogenic nuclide data. © University of Washingtonen_AU
dc.identifier.citationFabel, D., Fink, D., Fredin, O., Harbor, J., Land, M., & Stroeven, A. P. (2006). Exposure ages from relict lateral moraines overridden by the Fennoscandian ice sheet. Quaternary Research, 65(1), 136-146. doi:10.1016/j.yqres.2005.06.006en_AU
dc.identifier.issn1096-0287en_AU
dc.identifier.issue1en_AU
dc.identifier.journaltitleQuaternary Researchen_AU
dc.identifier.pagination136-146en_AU
dc.identifier.urihttps://doi.org/10.1016/j.yqres.2005.06.006en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12606en_AU
dc.identifier.volume65en_AU
dc.language.isoenen_AU
dc.publisherCambridge University Pressen_AU
dc.subjectSwedenen_AU
dc.subjectAge estimationen_AU
dc.subjectRelict radiationen_AU
dc.subjectMorainesen_AU
dc.subjectGeologic depositsen_AU
dc.subjectSoilsen_AU
dc.subjectIceen_AU
dc.subjectGlaciersen_AU
dc.titleExposure ages from relict lateral moraines overridden by the Fennoscandian ice sheeten_AU
dc.typeJournal Articleen_AU
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