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              <p>Oxygen in seawater is a key parameter for the development oflife; changes  in  dissolved  O2 concentrations throughout thePhanerozoic have played a major role in the evolution of marineecosystem s  through  com plex  interactions  with  dissolvednutrients. However, the precise timing and magnitude of@uctuations in global ocean oxygenation in the past remainpoorly constrained. U stable isotope compositions recorded in marine anoxicsedim ents m ay be used to reconstruct the global extent of m arineanoxia due to their sensitivity to the rem oval @ux of reducedU(IV) from seawater. Nonetheless, it is critical to understandlocal sedim entary  processes and  their im pact on  U  isotopefractionation before any global redox inform ation can be inferredfrom  A238U variations in the sediments. In particular, previousstudies have suggested that U  isotopes could be fractionated byorganic matter in the water column, and that this process mightaCect the isotope value recorded in the sedim ent [1,2]. In this w ork, w e explore the im pact of organic m atter onA238U values measured in Arctic Ocean sediments (IODPExpedition 302) deposited during the Early to Middle Eocene(~56–46  M a), a period  characterised  by  strong  hydrographicrestriction and high productivity in the A rctic basin.[1]   Holmden,   Amini   &amp;   François   (2015),  Geochimica etCosmochimica Acta153, 202-215. [2] Hinojosa, Stirling, Reid,Moy &amp; Wilson (2016), Geochimica et Cosmochimica Acta179,89-109</p>
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