Acoustic evidences of along-slope processes associated with mass movement deposits on the Madeira Island lower slope (Eastern Central Atlantic). | Evidencias acústicas de procesos paralelos al talud asociados con depósitos de movimiento en masa en el talud inferior de la Isla de Madeira (Atlántico Central Oriental)
2015
Roque, C. (Cristina) | Madureira, P. (Pedro) | Hernández-Molina, F.J. (Francisco Javier) | Santos de Campos, A. | Quartau, R. | Carrara, G. | Brandão, F. | Vázquez, J.T. (Juan Tomás) | Somoza-Losada, L. (Luis)
西班牙语; 卡斯蒂利亚语. Versión del editor
显示更多 [+] 显示较少 [-]英语. The Madeira Island lower slope has been build-up mostly by along slope-processesassociated with mass movement deposits as seen in GEBCO bathymetry, multibeam bathymetry,Parasound echosounder profiles and multichannel seismic reflection profiles. A plastered contouritedrift (Madeira Drift) developed on this lower slope, being composed of seismic units D1, D2 and D3.The most probable water mass responsible for its deposition is the Antarctica Bottom Water(AABW). The youngest sediments of seismic units D2 and D3 are affected by gravity-drivenprocesses, probably slumps and debris flows, which moved downslope towards west. Parasoundprofiles show evidences of such mass movements on present-day seabottom (e.g. diffractionhyperbolae echoes) but also of past-events buried within the contourite sediments. These olderdebris flows are recognized by semitransparent/transparent acoustic facies and lenticular shape.
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