Topographic controls on post-Oligocene changes in ice-sheet dynamics, Prydz Bay region, East Antarctica

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dc.contributor.author Taylor, J.
dc.contributor.author Siegert, M. J.
dc.contributor.author Payne, A. J.
dc.contributor.author Hambrey, Michael J.
dc.contributor.author O'Brien, P. E.
dc.contributor.author Cooper, A. K.
dc.contributor.author Leitchenkov, G.
dc.date.accessioned 2009-05-18T11:17:22Z
dc.date.available 2009-05-18T11:17:22Z
dc.date.issued 2004
dc.identifier.citation Taylor , J , Siegert , M J , Payne , A J , Hambrey , M J , O'Brien , P E , Cooper , A K & Leitchenkov , G 2004 , ' Topographic controls on post-Oligocene changes in ice-sheet dynamics, Prydz Bay region, East Antarctica ' Geology , vol 32 , no. 3 , pp. 197-200 . en
dc.identifier.issn 0091-7613
dc.identifier.other PURE: 100585
dc.identifier.other dspace: 2160/2236
dc.identifier.uri http://hdl.handle.net/2160/2236
dc.identifier.uri http://www.bgc.bris.ac.uk/research/CenozoicEvolution/pubs/Taylor.pdf en
dc.description Hambrey, M.J., Taylor, J., Siegert, M.J., Payne, A.J., O'Brien, P.E., Cooper, A.K., Leitchenkov, G., (2004) Topographic controls on post-Oligocene changes in ice-sheet, dynamics, Prydz Bay region, East Antarctica, Geology 32 (3), pp. 197–200 Keywords: Antarctica, ice sheets, numerical models, Miocene, Pliocene en
dc.description.abstract Within the general trend of post-Eocene cooling, the largest and oldest outlet of the East Antarctic Ice Sheet underwent a change from ice-cliff to ice-stream and/or ice-shelf dynamics, with an associated switch from line-source to fan sedimentation. Available geological data reveal little about the causes of these changes in ice dynamics during the Miocene Epoch, or the subsequent effects on Pliocene–Pleistocene ice-sheet history. Icesheet numerical modeling reveals that bed morphology was probably responsible for driving changes in both ice-sheet extent and dynamics in the Lambert-Amery system at Prydz Bay. The modeling shows how the topography and bathymetry of the Lambert graben and Prydz Bay control ice-sheet extent and flow. The changes in bathymetric volume required for shelf-edge glaciation correlate well with the Prydz Channel fan sedimentation history. This suggests a negative feedback between erosion and glaciation, whereby the current graben is overdeepened to such an extent that shelf-edge glaciation is now not possible, even if a Last Glacial Maximum environment recurs. We conclude that the erosional history of the Lambert graben and Prydz Bay in combination with the uplift histories of the surrounding mountains are responsible for the evolution of this section of the East Antarctic Ice Sheet, once the necessary initial climatic conditions for glaciation were achieved at the start of the Oligocene Epoch. en
dc.format.extent 4 en
dc.language.iso eng
dc.relation.ispartof Geology en
dc.title Topographic controls on post-Oligocene changes in ice-sheet dynamics, Prydz Bay region, East Antarctica en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.1130/G20275.1
dc.contributor.institution Institute of Geography & Earth Sciences en
dc.contributor.institution Centre for Glaciology en
dc.description.status Peer reviewed en


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