A 2 million year glacial chronology of the Hatherton Glacier, Antarctica and implications for the size of the East Antarctic Ice Sheet at the Last Glacial Maximum

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dc.contributor.authorJoy, Ken_AU
dc.contributor.authorFink, Den_AU
dc.contributor.authorStorey, BCen_AU
dc.contributor.authorAtkins, Cen_AU
dc.date.accessioned2014-11-25T02:57:24Zen_AU
dc.date.available2014-11-25T02:57:24Zen_AU
dc.date.issued2014-01-01en_AU
dc.date.statistics2014-11-25en_AU
dc.description.abstractA series of distinct glacial deposits flanking the margins of the upper Hatherton Glacier, an outlet glacier in the central Transantarctic Mountains, are used to constrain the behaviour of the Antarctic ice-sheets. Cosmogenic exposure ages of 18 erratics from four glacial drifts covering the ice free Dubris and Bibra valleys, range in age from 5 to 1997 ka. Our results document four glacial advance and retreat events superimposed on an overall long-term ice thickness reduction of about 500 m since the mid-Pleistocene. The lack of field evidence and absence of LGM exposure ages in the glacial deposits of the Hatherton Glacier supports our conclusion that at the LGM the East Antarctic Ice Sheet was of similar size, or may have been slightly smaller, than present. Minimum exposure ages from the oldest two glacial events, represented by the Isca and Danum drifts, are similar to 1-2 Ma and similar to 0.5 Ma respectively. The Britannia-II Drift, previously assumed to mark the maximum extent of the Last Glacial Maximum advance, has a mean Be-10 age of 126 +/- 3.2 ka (n = 5). Ages from the younger Britannia-I Drift suggest that since the mid-Holocene (6.5 +/- 1.2 ka, n = 5), approximately 200 m of additional ice has been lost. © 2014, Elsevier Ltd.en_AU
dc.identifier.citationJoy, K., Fink, D., Storey, B., & Atkins, C. (2014). A 2 million year glacial chronology of the Hatherton Glacier, Antarctica and implications for the size of the East Antarctic Ice Sheet at the Last Glacial Maximum. Quaternary Science Reviews, 83, 46-57. doi:10.1016/j.quascirev.2013.10.028en_AU
dc.identifier.govdoc5463en_AU
dc.identifier.issn0277-3791en_AU
dc.identifier.journaltitleQuaternary Science Reviewsen_AU
dc.identifier.pagination46-57en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.quascirev.2013.10.028en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/6064en_AU
dc.identifier.volume83en_AU
dc.language.isoenen_AU
dc.publisherPergamon-Elsevier Science Ltden_AU
dc.subjectGlaciersen_AU
dc.subjectAntarcticaen_AU
dc.subjectIceen_AU
dc.subjectBeryllium 10en_AU
dc.subjectAluminium 26en_AU
dc.subjectNew Zealanden_AU
dc.titleA 2 million year glacial chronology of the Hatherton Glacier, Antarctica and implications for the size of the East Antarctic Ice Sheet at the Last Glacial Maximumen_AU
dc.typeJournal Articleen_AU
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