FN Archimer Export Format PT CHAP TI The Last Glacial Maximum Balearic Abyssal Plain Megabed revisited BT Georgiopoulou, A., Amy, L. A., Benetti, S., Chaytor, J. D., Clare, M. A., Gamboa, D., Haughton, P. D. W., Moernaut, J. and Mountjoy, J. J. (eds) 2020. Subaqueous Mass Movements and their Consequences: Advances in Process Understanding, Monitoring and Hazard Assessments. Geological Society, London, Special Publications, 500, 341–357. AF Cattaneo, Antonio Badhani, Shray Caradonna, Cristina Bellucci, Massimo Leroux, Estelle Babonneau, Nathalie Garziglia, Sebastien Poort, Jeffrey Akhmanov, Grigorii G. Bayon, Germain Dennielou, Bernard Jouet, Gwenael Migeon, Sebastien Rabineau, Marina Droz, Laurence Clare, Michael AS 1:1;2:1;3:3;4:2;5:1;6:1;7:1;8:4;9:5;10:1;11:1;12:1;13:6;14:;15:;16:7; FF 1:PDG-REM-GM-LAD;2:PDG-REM-GM-LAD;3:;4:;5:PDG-REM-GM-LGS;6:;7:PDG-REM-GM-LAD;8:;9:;10:PDG-REM-GM-LGS;11:PDG-REM-GM-LGS;12:PDG-REM-GM-LGS;13:;14:;15:;16:; C1 IFREMER, Géosciences Marines, Plouzané, France UMR 6538 Géosciences Océan, Université de Brest, France Università di Trieste, Italy UMR 7193 ISTeP, Sorbonne Université, Paris, France Lomonosov Moscow State University, Moscow, Russian Federation UMR7329, GEOAZUR, Valbonne, France National Oceanography Centre, University of Southampton, United Kingdom C2 IFREMER, FRANCE UBO, FRANCE UNIV TRIESTE, ITALY UNIV PARIS 06, FRANCE UNIV LOMONOSOV MOSCOW STATE, RUSSIA UNIV NICE, FRANCE NOC, UK SI BREST SE PDG-REM-GM-LAD PDG-REM-GM-LGS UR https://archimer.ifremer.fr/doc/00614/72597/71595.pdf LA English DT Book section CR AM-MED-1 PALAEOFLUX PRISME PROGRES SARDINIA WESTMEDFLUX WESTMEDFLUX-2 BO Le Suroît Marion Dufresne L'Atalante AB Megabeds are thick sedimentary layers extending over thousands square kilometres in deep sea basins and are thought to result from large slope failures triggered by major external events. Such deposits have been found in at least three areas of the Mediterranean Sea. Although their discovery dates back to the early 1980s, many questions remain, concerning their initiation, source area, extent, and the nature of their emplacement. One of the largest previously documented megabeds was emplaced during the Last Glacial Maximum across the Balearic Abyssal Plain with a thickness of 8-10 m in water depths of up to 2800 m. New 3.5 kHz sub-bottom profiles and sediment cores provide greater constraint on the lateral variability of the megabed and allow to map it beyond previous estimates, with a revised areal extent up to 90,000-100,000 km2. Megabed terminations show gradual pinch-out to the West and an abrupt eastward termination against the Sardinia steep margin. The megabed presents both in seismic profiles and in sediment cores a tripartite subdivision likely corresponding to changes in flow regimes across the basin with a central area of sandy facies and erosional base oriented NNE-SSW allowing renewed discussions about sources and trigger of the megabed. PY 2020 DI 10.1144/SP500-2019-188 ID 72597 ER EF