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The last glacial maximum Balearic abyssal plain megabed revisited

Antonio Cattaneo, Shray Badhani, Cristina Caradonna, Massimo Bellucci, Estelle Leroux, Nathalie Babonneau, Sebastien Garziglia, Jeffrey Poort, Grigorii G. Akhmanov, Germain Bayon, Bernard Dennielou, Gwenaeel Jouet, Sebastien Migeon, Marina Rabineau, Laurence Droz and Michael Clare
The last glacial maximum Balearic abyssal plain megabed revisited (in Subaqueous mass movements and their consequences; advances in process understanding, monitoring and hazard assessments, A. Georgiopoulou (editor), L. A. Amy (editor), S. Benetti (editor), J. D. Chaytor (editor), M. A. Clare (editor), D. Gamboa (editor), P. D. W. Haughton (editor), J. Moernaut (editor) and J. J. Mountjoy (editor))
Special Publication - Geological Society of London (March 2020) 500: 341-357

Abstract

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 km (super 2) 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.


ISSN: 0305-8719
Coden: GSLSBW
Serial Title: Special Publication - Geological Society of London
Serial Volume: 500
Title: The last glacial maximum Balearic abyssal plain megabed revisited
Title: Subaqueous mass movements and their consequences; advances in process understanding, monitoring and hazard assessments
Author(s): Cattaneo, AntonioBadhani, ShrayCaradonna, CristinaBellucci, MassimoLeroux, EstelleBabonneau, NathalieGarziglia, SebastienPoort, JeffreyAkhmanov, Grigorii G.Bayon, GermainDennielou, BernardJouet, GwenaeelMigeon, SebastienRabineau, MarinaDroz, LaurenceClare, Michael
Author(s): Georgiopoulou, A.editor
Author(s): Amy, L. A.editor
Author(s): Benetti, S.editor
Author(s): Chaytor, J. D.editor
Author(s): Clare, M. A.editor
Author(s): Gamboa, D.editor
Author(s): Haughton, P. D. W.editor
Author(s): Moernaut, J.editor
Author(s): Mountjoy, J. J.editor
Affiliation: IFREMER, Unite Geosciences Marines, Plouzane, France
Pages: 341-357
Published: 20200311
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 54
Accession Number: 2021-047026
Categories: Quaternary geologyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. cols., 2 tables, sects.
N38°00'00" - N42°00'00", E02°00'00" - E08°00'00"
Secondary Affiliation: Universita di Trieste, ITA, ItalyUniversite de Brest, FRA, FranceInstitut des Sciences de la Terre Paris, FRA, FranceLomonosov Moscow State University, RUS, Russian FederationUniversite Cote d'Azur, FRA, FranceUniversity of Southampton Waterfront Campus, GBR, United Kingdom
Source Note: Online First
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 202115
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