FN Archimer Export Format PT J TI Millennial scale persistence of organic carbon bound to iron in Arctic marine sediments BT AF Faust, Johan C. Tessin, Allyson Fisher, Ben J. Zindorf, Mark Sebastian Papadaki, Sonia Hendry, Katharine R. Doyle, Katherine A. März, Christian AS 1:1;2:2;3:1;4:3;5:4;6:4;7:1;8:1; FF 1:;2:;3:;4:PDG-REM-EEP-LEP;5:;6:;7:;8:; C1 School of Earth and Environment, The University of Leeds, Leeds, UK Department of Geology, Kent State University, Kent, OH, USA Laboratoire Environnement Profond, Ifremer - Centre de Bretagne, Plouzané, France School of Earth Sciences, University of Bristol, Bristol, UK C2 UNIV LEEDS, UK UNIV KENT, USA IFREMER, FRANCE UNIV BRISTOL, UK SI BREST SE PDG-REM-EEP-LEP IN WOS Ifremer UPR DOAJ copubli-europe copubli-int-hors-europe IF 17.694 TC 33 UR https://archimer.ifremer.fr/doc/00675/78755/80923.pdf https://archimer.ifremer.fr/doc/00675/78755/80924.pdf https://archimer.ifremer.fr/doc/00675/78755/80925.pdf https://archimer.ifremer.fr/doc/00675/78755/80926.pdf https://archimer.ifremer.fr/doc/00675/78755/80927.xlsx LA English DT Article AB Burial of organic material in marine sediments represents a dominant natural mechanism of long-term carbon sequestration globally, but critical aspects of this carbon sink remain unresolved. Investigation of surface sediments led to the proposition that on average 10-20% of sedimentary organic carbon is stabilised and physically protected against microbial degradation through binding to reactive metal (e.g. iron and manganese) oxides. Here we examine the long-term efficiency of this rusty carbon sink by analysing the chemical composition of sediments and pore waters from four locations in the Barents Sea. Our findings show that the carbon-iron coupling persists below the uppermost, oxygenated sediment layer over thousands of years. We further propose that authigenic coprecipitation is not the dominant factor of the carbon-iron bounding in these Arctic shelf sediments and that a substantial fraction of the organic carbon is already bound to reactive iron prior deposition on the seafloor. PY 2021 PD JAN SO Nature Communications SN 2041-1723 PU Springer Science and Business Media LLC VL 12 IS 1 UT 000662809200002 DI 10.1038/s41467-020-20550-0 ID 78755 ER EF