info:eu-repo/semantics/publishedVersion
Block Generation, Deformation, and Interaction of Mass‐Transport Deposits With the Seafloor: An Outcrop‐Based Study of the Carboniferous Paganzo Basin (Cerro Bola, NW Argentina)
Fecha
2019Registro en:
Sobiesiak, Matheus; Valdez Buso, Victoria; Kneller, Ben; Alsop, G. Ian; Milana, Juan Pablo; Block Generation, Deformation, and Interaction of Mass‐Transport Deposits With the Seafloor: An Outcrop‐Based Study of the Carboniferous Paganzo Basin (Cerro Bola, NW Argentina); Wiley; 2019; 91-104
9781119500582
CONICET Digital
CONICET
Autor
Sobiesiak, Matheus
Valdez Buso, Victoria
Kneller, Ben
Alsop, G. Ian
Milana, Juan Pablo
Resumen
Mass‐transport processes are notorious for their ability to carry large blocks or megaclasts, to deform sediments, and to interact with the seafloor through deformation and/or erosion of the substrate. These processes, together with their influence on slope sedimentation, are themes we address via direct field observation of three Carboniferous‐aged mass‐transport deposits (MTDs) (labeled I, II, and III) from Cerro Bola, NW Argentina. Internal deformation can be observed in all three MTDs, although it is best developed in MTD II, a 180m thick vertically zoned MTD with deformation evolving upward from a simple shear dominated base to a pure shear middle zone and finally back into a simple shear dominated topmost zone. The contact between MTDs I and II and their underlying sandstone substrates are also locally deformed, with plastic deformation affecting up to ~20m of substrate below the MTD base. Conversely, the basal contact between MTD II and the substrate is also in part erosional, marked by scours and grooves that truncate the bedding in the topmost layers of the substrate. Additionally, the presence of large blocks composed of diverse lithologies embedded within the MTDs, together with the sedimentological description of the MTD?s matrix and the aforementioned interaction with the seafloor, suggests at least two processes accountable for block generation within MTDs.