Antarctica at the global ‘Last Glacial Maximum’ – what can we learn from cosmogenic 10Be and 26Al exposure ages?

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dc.contributor.authorFink, Den_AU
dc.date.accessioned2017-02-10T04:15:02Zen_AU
dc.date.available2017-02-10T04:15:02Zen_AU
dc.date.issued2014-08-24en_AU
dc.date.statistics2017-02-10en_AU
dc.description.abstractIce volume changes at the coastal margins of Antarctica during the global LGM are uncertain. The little evidence available suggests that behaviour of the East and West Antarctic Ice Sheets are markedly different - and complex. It is hypothesised that during interglacials, thinning of the Ross Ice Shelf, a more open-water environment and increased precipitation, allowed outlet glaciers draining the Transantarctic Mnts and fed by interior Ice Sheets to advance during moist warmer periods, out of phase with colder arid periods. In contrast, glacier dynamics along the vast coastal perimeter of East Antarctica is strongly influenced by Southern Ocean conditions. Cosmogenic 10Be and 26Al chronologies, although restricted to ice-free ”oasis” and mountains flanking drainage glaciers, has become an invaluable, if not unique, tool to quantify Pleistocene ice sheet variability. Despite major advances, extracting reliable ages from glacial deposits in polar regions is problematic - recycling of previously exposed/ buried debris and continual post-depositional modification leads to age ambiguities for a coeval glacial landform. More importantly, cold-based ice advance can leave a landform unmodified resulting in young erratics deposited on ”ancient” bedrock. Exposure ages from different localities throughout East Antarctica (Framnes Mnts, Lutzow-Holm Bay, Vestfold Hills) and West Antarctica (Denton Ranges, Hatherton Glacier, Shackleton Range) highlight some of the new findings. This talk presents results which quantify the magnitude and timing of paleo-ice sheet thickness changes, questions the validity of an ”Antarctic LGM” and discusses the complexities presented by the geological spread observed in such studies.en_AU
dc.identifier.citationFink, D. (2014). Antarctica at the global ‘Last Glacial Maximum’ – what can we learn from cosmogenic 10Be and 26Al exposure ages? Paper presented at AMS-13 The Thirteenth International Conference on Accelerator Mass Spectrometry 24−29 August 2014 Aix - Marseille University - Montperrin Campus Aix en Provence, France.en_AU
dc.identifier.conferenceenddate29 August 2014en_AU
dc.identifier.conferencenameAMS-13 The Thirteenth International Conference on Accelerator Mass Spectrometryen_AU
dc.identifier.conferenceplaceAix, Franceen_AU
dc.identifier.conferencestartdate24 August 2014en_AU
dc.identifier.govdoc7852en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/8286en_AU
dc.language.isoenen_AU
dc.publisherAMS-13en_AU
dc.subjectIceen_AU
dc.subjectAntarcticaen_AU
dc.subjectGlaciersen_AU
dc.subjectBedrock projecten_AU
dc.subjectSeasen_AU
dc.subjectCosmologyen_AU
dc.titleAntarctica at the global ‘Last Glacial Maximum’ – what can we learn from cosmogenic 10Be and 26Al exposure ages?en_AU
dc.typeConference Abstracten_AU
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