Fluctuation history of the interior East Antarctic ice sheet since mid-pliocene

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dc.contributor.authorHuang, FXen_AU
dc.contributor.authorLiu, XHen_AU
dc.contributor.authorKong, Pen_AU
dc.contributor.authorFink, Den_AU
dc.contributor.authorJu, YTen_AU
dc.contributor.authorFang, AMen_AU
dc.contributor.authorYu, LJen_AU
dc.contributor.authorLi, XLen_AU
dc.contributor.authorNa, CGen_AU
dc.date.accessioned2009-01-28en_AU
dc.date.accessioned2010-04-30T05:01:35Zen_AU
dc.date.available2009-01-28en_AU
dc.date.available2010-04-30T05:01:35Zen_AU
dc.date.issued2008-04en_AU
dc.date.statistics2008-04en_AU
dc.description.abstractCosmogenic Be-10 and Al-26 measurements from bedrock exposures in East Antarctica provide indications of how long the rock surface has been free from glacial cover. Samples from the crests of Zakharoff Ridge and Mount Harding, two typical nunataks in the Grove Mountains, show minimum Be-10 ages of 2.00 +/- 0.22 and 2.30 +/- 0.26 Ma, respectively. These ages suggest that the crests were above the ice sheet at least since the Plio -Pleistocene boundary. Adopting a 'reasonable' erosion rate of 5-10 cm Ma(-1) increases the exposure ages of these two samples to extend into the mid-Pliocene. The bedrock exposure ages steadily decrease with decreasing elevation on the two nunataks, which indicates similar to 200 m decrease of the ice sheet in the Grove Mountains since mid-Pliocene time. Seven higher elevation samples exhibit a simple exposure history, which indicates that the ice sheet in the Grove Mountains decreased only similar to 100 in over a period as long as 1-2 Ma. This suggests that the East Antarctic Ice Sheet (EAIS) was relatively stable during the Pliocene warm interval. Five lower elevation samples suggest a complex exposure history, and indicate that the maximum subsequent increase of the EAIS was only 100 in higher than the present ice surface. Considering the uncertainties, their total initial exposure and subsequent burial time could be later than mid-Pliocene, which may not conflict with the stable mid-Pliocene scenario. © 2008, Cambridge University Pressen_AU
dc.identifier.citationHuang, F., Liu, X., Kong, P., Fink, D., Ju, Y., Fang, A., Yu, L., Li, X., & Na, C. (2008). Fluctuation history of the interior East Antarctic ice sheet since mid-pliocene. Antarctic Science, 20(2), 197-203. doi:10.1017/S0954102007000910en_AU
dc.identifier.govdoc1091en_AU
dc.identifier.issn0954-1020en_AU
dc.identifier.issue2en_AU
dc.identifier.journaltitleAntarctic Scienceen_AU
dc.identifier.pagination197-203en_AU
dc.identifier.urihttp://dx.doi.org/10.1017/S0954102007000910en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1256en_AU
dc.identifier.volume20en_AU
dc.language.isoenen_AU
dc.publisherCambridge University Pressen_AU
dc.subjectFluctuationsen_AU
dc.subjectAntarctic regionsen_AU
dc.subjectIceen_AU
dc.subjectPleistocene epochen_AU
dc.subjectRock bedsen_AU
dc.subjectMountainsen_AU
dc.titleFluctuation history of the interior East Antarctic ice sheet since mid-plioceneen_AU
dc.typeJournal Articleen_AU
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