The Malta-Sicily Escarpment: Mass movement dynamics in a sediment-undersupplied margin

Aaron Micallef, Aggeliki Georgiopoulou, Timothy Le Bas, Joshu Mountjoy, Veerle Huvenne, Claudio Lo Iacono

Research output: Chapter in Book/Conference proceeding with ISSN or ISBNConference contribution with ISSN or ISBN

Abstract

The Malta-Sicily Escarpment (MSE) is a steep carbonate escarpment that appears to have largely remained isolated from inputs of fluvial and littoral sediments since the Messinian Salinity Crisis. Mass movement activity has so far only been inferred from sediment cores at the base of the MSE. In this study we use geophysical and sedimentological data acquired from the upper MSE and outer Malta Plateau to: (i) map and characterise the dominant forms of mass movements, and (ii) determine the nature and origin of these mass movements, and their role in the evolution of the MSE. We document 67 mass movement scars across 370 km2 of seafloor. Slope instability entailed translational slides, spreads and debris flows that mobilised Plio-Pleistocene outer shelf hemipelagic/pelagic sediments or carbonate sequences across the upper continental slope. Slope failure events are caused by loss of support associated with the formation of channels, gullies, canyon heads and fault-related escarpments. Mass movements play a key role in eroding the seafloor and transferring material to the lower MSE. In particular, they control the extent of headward and lateral extension of submarine canyons, facilitate tributary development, remove material from the continental shelf and slope, and feed sediment and drive its transport across the submarine canyon system.

Original languageEnglish
Title of host publicationSubmarine Mass Movements and Their Consequences, 6th International Symposium
PublisherKluwer Academic Publishers
Pages317-328
Number of pages12
ISBN (Electronic)9783319009711
DOIs
Publication statusPublished - 1 Jan 2016

Keywords

  • Malta-Sicily Escarpment
  • Mediterranean
  • Sediment under supplied margin
  • Submarine canyon
  • Submarine mass movement

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