FN Archimer Export Format PT J TI Carbon and sediment fluxes inhibited in the submarine Congo Canyon by landslide-damming BT AF Pope, Ed L. Heijnen, Maarten S. Talling, Peter J. SILVA JACINTO, Ricardo Gaillot, Arnaud Baker, Megan L. HAGE, Sophie Hasenhündl, Martin Heerema, Catharina J. McGhee, Claire Ruffell, Sean C. Simmons, Stephen M. Cartigny, Matthieu J. B. Clare, Michael A. Dennielou, Bernard Parsons, Daniel R. Peirce, Christine Urlaub, Morelia AS 1:1;2:2,3;3:1;4:4;5:4;6:1;7:5,6;8:7;9:1,8;10:9;11:1;12:10;13:1;14:2;15:4;16:10;17:1;18:11; FF 1:;2:;3:;4:PDG-REM-GEOOCEAN-ASTRE;5:PDG-REM-GEOOCEAN-ANTIPOD;6:;7:;8:;9:;10:;11:;12:;13:;14:;15:PDG-REM-GEOOCEAN-ASTRE;16:;17:;18:; C1 Departments of Geography and Earth Science, Durham University, Durham, UK National Oceanography Centre Southampton, Southampton, UK School of Ocean and Earth Sciences, University of Southampton, Southampton, UK Marine Geosciences Unit, IFREMER Centre de Brest, Plouzané, France Department of Geosciences, University of Calgary, Calgary, Alberta, Canada Univ Brest, CNRS, Ifremer, Geo-Ocean, Plouzané, France Institute of Hydraulic Engineering and Water Resources Management, TU Wien, Vienna, Austria Department of Geography, University of Victoria, Victoria, British Columbia, Canada School of Civil Engineering and Geosciences, Newcastle University, Newcastle upon Tyne, UK Energy and Environment Institute, University of Hull, Hull, UK GEOMAR Helmholtz Centre for Ocean Research, Kiel, Germany C2 UNIV DURHAM, UK NOC, UK UNIV SOUTHAMPTON, UK IFREMER, FRANCE UNIV CALGARY, CANADA UBO, FRANCE UNIV VIENNA, AUSTRIA UNIV VICTORIA, CANADA UNIV NEWCASTLE, UK UNIV HULL, UK IFM GEOMAR, GERMANY SI BREST SE PDG-REM-GEOOCEAN-ASTRE PDG-REM-GEOOCEAN-ANTIPOD UM GEO-OCEAN IN WOS Ifremer UMR WOS Cotutelle UMR copubli-france copubli-europe copubli-univ-france copubli-int-hors-europe IF 18.3 TC 4 UR https://archimer.ifremer.fr/doc/00796/90748/96344.pdf https://archimer.ifremer.fr/doc/00796/90748/96356.pdf LA English DT Article CR OPTIC CONGO 2 BO Beautemps-Beaupré AB Landslide-dams, which are often transient, can strongly affect the geomorphology, and sediment and geochemical fluxes, within subaerial fluvial systems. The potential occurrence and impact of analogous landslide-dams in submarine canyons has, however, been difficult to determine due to a scarcity of sufficiently time-resolved observations. Here we present repeat bathymetric surveys of a major submarine canyon, the Congo Canyon, offshore West Africa, from 2005 and 2019. We show how an ~0.09 km3 canyon-flank landslide dammed the canyon, causing temporary storage of a further ~0.4 km3 of sediment, containing ~5 Mt of primarily terrestrial organic carbon. The trapped sediment was up to 150 m thick and extended >26 km up-canyon of the landslide-dam. This sediment has been transported by turbidity currents whose sediment load is trapped by the landslide-dam. Our results suggest canyon-flank collapses can be important controls on canyon morphology as they can generate or contribute to the formation of meander cut-offs, knickpoints and terraces. Flank collapses have the potential to modulate sediment and geochemical fluxes to the deep sea and may impact efficiency of major submarine canyons as transport conduits and locations of organic carbon sequestration. This has potential consequences for deep-sea ecosystems that rely on organic carbon transported through submarine canyons. PY 2022 PD OCT SO Nature Geoscience SN 1752-0894 PU Springer Science and Business Media LLC VL 15 IS 10 UT 000863134400001 BP 845 EP 853 DI 10.1038/s41561-022-01017-x ID 90748 ER EF