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Ocean mixing and ice-sheet control of seawater 234U/238U during the last deglaciation.
Chen, Tianyu; Robinson, Laura F; Beasley, Matthew P; Claxton, Louis M; Andersen, Morten B; Gregoire, Lauren J; Wadham, Jemma; Fornari, Daniel J; Harpp, Karen S.
Afiliação
  • Chen T; Bristol Isotope Group, School of Earth Sciences, University of Bristol, Bristol, UK.
  • Robinson LF; Bristol Isotope Group, School of Earth Sciences, University of Bristol, Bristol, UK.
  • Beasley MP; Bristol Isotope Group, School of Earth Sciences, University of Bristol, Bristol, UK.
  • Claxton LM; Bristol Isotope Group, School of Earth Sciences, University of Bristol, Bristol, UK.
  • Andersen MB; Institute of Geochemistry and Petrology, Department of Earth Sciences, ETH Zürich, Zürich, Switzerland.
  • Gregoire LJ; School of Earth and Ocean Sciences, Cardiff University, Cardiff, UK.
  • Wadham J; School of Earth and Environment, University of Leeds, Leeds, UK.
  • Fornari DJ; Bristol Glaciology Centre, School of Geographical Sciences, University of Bristol, Bristol, UK.
  • Harpp KS; Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA.
Science ; 354(6312): 626-629, 2016 11 04.
Article em En | MEDLINE | ID: mdl-27811276
Seawater 234U/238U provides global-scale information about continental weathering and is vital for marine uranium-series geochronology. Existing evidence supports an increase in 234U/238U since the last glacial period, but the timing and amplitude of its variability has been poorly constrained. Here we report two seawater 234U/238U records based on well-preserved deep-sea corals from the low-latitude Atlantic and Pacific Oceans. The Atlantic 234U/238U started to increase before major sea-level rise and overshot the modern value by 3 per mil during the early deglaciation. Deglacial 234U/238U in the Pacific converged with that in the Atlantic after the abrupt resumption of Atlantic meridional overturning. We suggest that ocean mixing and early deglacial release of excess 234U from enhanced subglacial melting of the Northern Hemisphere ice sheets have driven the observed 234U/238U evolution.
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Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Science Ano de publicação: 2016 Tipo de documento: Article
Buscar no Google
Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Science Ano de publicação: 2016 Tipo de documento: Article