Cosmogenic nuclide exposure age constraints on the glacial history of the Lake Wellman area, Darwin Mountains, Antarctica

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dc.contributor.authorStorey, BCen_AU
dc.contributor.authorFink, Den_AU
dc.contributor.authorHood, Den_AU
dc.contributor.authorJoy, Ken_AU
dc.contributor.authorShulmeister, Jen_AU
dc.contributor.authorRiger-Kusk, Men_AU
dc.contributor.authorStevens, MIen_AU
dc.date.accessioned2011-02-02T23:56:42Zen_AU
dc.date.available2011-02-02T23:56:42Zen_AU
dc.date.issued2010-12en_AU
dc.date.statistics2010-12en_AU
dc.description.abstractWe present direct terrestrial evidence of ice volume change of the Darwin and Hatherton glaciers which channel ice from the Transantarctic Mountains into the Ross Ice Shelf. Combining glacial geomorphology with cosmogenic exposure ages from 25 erratics indicates a pre-LGM ice volume at least 600 m thicker than current Hatherton ice elevation was established at least 2.2 million years ago. In particular, five erratics spread across a drift deposit at intermediate elevations located below a prominent moraine feature mapped previously as demarcating the LGM ice advance limits, give a well-constrained single population with mean 10Be age of 37.0 ± 5.5 ka (1σ). At lower elevations of 50–100 m above the surface of Lake Wellman, a further five samples from within a younger drift deposit range in exposure age from 1 to 19 ka. Our preferred age model interpretation, which is partly dependent on the selection of a minimum or maximum age-elevation model, suggests that LGM ice volume was not as large as previously estimated and constrains LGM ice elevation to be within ± 50 m of the modern Hatherton Glacier ice surface, effectively little different from what is observed today. © 2010, Cambridge University Pressen_AU
dc.identifier.citationStorey, B. C., Fink, D., Hood, D., Joy, K., Shulmeister, J., Riger-Kusk, M., & Stevens, M. I. (2010). Cosmogenic nuclide exposure age constraints on the glacial history of the Lake Wellman area, Darwin Mountains, Antarctica. Antarctic Science, 22(Special Issue 6 - The Latitudinal Gradient Project (LGP)), 603-618. doi:10.1017/S0954102010000799en_AU
dc.identifier.govdoc3176en_AU
dc.identifier.issn0954-1020en_AU
dc.identifier.issueSpecial Issue, 6en_AU
dc.identifier.journaltitleAntarctic Scienceen_AU
dc.identifier.pagination603-618en_AU
dc.identifier.urihttp://dx.doi.org/10.1017/S0954102010000799en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/2983en_AU
dc.identifier.volume22en_AU
dc.language.isoenen_AU
dc.publisherCambridge University Pressen_AU
dc.subjectAge estimationen_AU
dc.subjectLatitude effecten_AU
dc.subjectAntarcticaen_AU
dc.subjectHistorical aspectsen_AU
dc.subjectGlaciersen_AU
dc.subjectEnvironmental exposureen_AU
dc.titleCosmogenic nuclide exposure age constraints on the glacial history of the Lake Wellman area, Darwin Mountains, Antarcticaen_AU
dc.typeJournal Articleen_AU
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