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A large West Antarctic Ice Sheet explains early Neogene sea-level amplitude.
Marschalek, J W; Zurli, L; Talarico, F; van de Flierdt, T; Vermeesch, P; Carter, A; Beny, F; Bout-Roumazeilles, V; Sangiorgi, F; Hemming, S R; Pérez, L F; Colleoni, F; Prebble, J G; van Peer, T E; Perotti, M; Shevenell, A E; Browne, I; Kulhanek, D K; Levy, R; Harwood, D; Sullivan, N B; Meyers, S R; Griffith, E M; Hillenbrand, C-D; Gasson, E; Siegert, M J; Keisling, B; Licht, K J; Kuhn, G; Dodd, J P; Boshuis, C; De Santis, L; McKay, R M.
Afiliação
  • Marschalek JW; Department of Earth Science and Engineering, Imperial College London, London, UK. j.marschalek18@imperial.ac.uk.
  • Zurli L; Department of Physical, Earth and Environmental Sciences, University of Siena, Siena, Italy.
  • Talarico F; Department of Physical, Earth and Environmental Sciences, University of Siena, Siena, Italy.
  • van de Flierdt T; Department of Earth Science and Engineering, Imperial College London, London, UK.
  • Vermeesch P; Department of Earth Sciences, University College London, London, UK.
  • Carter A; Department of Earth and Planetary Sciences, Birkbeck, University of London, London, UK.
  • Beny F; Laboratoire d'Océanologie et de Géosciences, UMR 8187 CNRS/Univ Lille/ULCO, Villeneuve d'Ascq, France.
  • Bout-Roumazeilles V; Laboratoire d'Océanologie et de Géosciences, UMR 8187 CNRS/Univ Lille/ULCO, Villeneuve d'Ascq, France.
  • Sangiorgi F; Department of Earth Sciences, Marine Palynology and Paleoceanography, Utrecht University, Utrecht, the Netherlands.
  • Hemming SR; Lamont-Doherty Earth Observatory of Columbia University Palisades, New York, NY, USA.
  • Pérez LF; British Antarctic Survey, Cambridge, UK.
  • Colleoni F; Geological Survey of Denmark and Greenland, Department of Marine Geology, Aarhus, Denmark.
  • Prebble JG; National Institute of Oceanography and Applied Geophysics - OGS, Trieste, Italy.
  • van Peer TE; GNS Science, Lower Hutt, New Zealand.
  • Perotti M; Department of Earth Sciences, University College London, London, UK.
  • Shevenell AE; National Oceanography Centre Southampton, University of Southampton Waterfront Campus, Southampton, UK.
  • Browne I; Department of Physical, Earth and Environmental Sciences, University of Siena, Siena, Italy.
  • Kulhanek DK; College of Marine Science, University of South Florida, St. Petersburg, FL, USA.
  • Levy R; College of Marine Science, University of South Florida, St. Petersburg, FL, USA.
  • Harwood D; International Ocean Discovery Program, Texas A&M University, College Station, TX, USA.
  • Sullivan NB; Institute of Geosciences, Christian-Albrechts-University of Kiel, Kiel, Germany.
  • Meyers SR; GNS Science, Lower Hutt, New Zealand.
  • Griffith EM; Institute of Geosciences, Christian-Albrechts-University of Kiel, Kiel, Germany.
  • Hillenbrand CD; Department of Earth and Atmospheric Sciences, University of Nebraska-Lincoln, Lincoln, NE, USA.
  • Gasson E; Department of Geoscience, University of Wisconsin-Madison, Madison, WI, USA.
  • Siegert MJ; Department of Geoscience, University of Wisconsin-Madison, Madison, WI, USA.
  • Keisling B; School of Earth Sciences, Ohio State University, Columbus, OH, USA.
  • Licht KJ; British Antarctic Survey, Cambridge, UK.
  • Kuhn G; Centre for Geography and Environmental Sciences, University of Exeter, Cornwall, UK.
  • Dodd JP; Department of Earth Science and Engineering, Imperial College London, London, UK.
  • Boshuis C; Grantham Institute, Imperial College London, London, UK.
  • De Santis L; Lamont-Doherty Earth Observatory of Columbia University Palisades, New York, NY, USA.
  • McKay RM; Department of Earth Sciences, Indiana University Purdue University Indianapolis, Indianapolis, IN, USA.
Nature ; 600(7889): 450-455, 2021 12.
Article em En | MEDLINE | ID: mdl-34912089
Early to Middle Miocene sea-level oscillations of approximately 40-60 m estimated from far-field records1-3 are interpreted to reflect the loss of virtually all East Antarctic ice during peak warmth2. This contrasts with ice-sheet model experiments suggesting most terrestrial ice in East Antarctica was retained even during the warmest intervals of the Middle Miocene4,5. Data and model outputs can be reconciled if a large West Antarctic Ice Sheet (WAIS) existed and expanded across most of the outer continental shelf during the Early Miocene, accounting for maximum ice-sheet volumes. Here we provide the earliest geological evidence proving large WAIS expansions occurred during the Early Miocene (~17.72-17.40 Ma). Geochemical and petrographic data show glacimarine sediments recovered at International Ocean Discovery Program (IODP) Site U1521 in the central Ross Sea derive from West Antarctica, requiring the presence of a WAIS covering most of the Ross Sea continental shelf. Seismic, lithological and palynological data reveal the intermittent proximity of grounded ice to Site U1521. The erosion rate calculated from this sediment package greatly exceeds the long-term mean, implying rapid erosion of West Antarctica. This interval therefore captures a key step in the genesis of a marine-based WAIS and a tipping point in Antarctic ice-sheet evolution.
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Texto completo: 1 Base de dados: MEDLINE Assunto principal: Água do Mar / Camada de Gelo / Elevação do Nível do Mar Tipo de estudo: Prognostic_studies Idioma: En Ano de publicação: 2021 Tipo de documento: Article
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Texto completo: 1 Base de dados: MEDLINE Assunto principal: Água do Mar / Camada de Gelo / Elevação do Nível do Mar Tipo de estudo: Prognostic_studies Idioma: En Ano de publicação: 2021 Tipo de documento: Article