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TitleActive faulting controls bedform development on a deep-water fan
AuthorMaselli, V; Micallef, A; Normandeau, AORCID logo; Oppo, D; Iacopini, D; Green, A; Ge, Z
SourceGeology 2021 p. 1-6, Open Access logo Open Access
Alt SeriesNatural Resources Canada, Contribution Series 20210080
PublisherGeological Society of America
Mediapaper; on-line; digital
File formatpdf; html
ProvinceOffshore region
AreaMediterranean Sea
Lat/Long WENS 34.9167 35.3833 33.9167 33.5000
Subjectsmarine geology; surficial geology/geomorphology; structural geology; tectonics; geophysics; Science and Technology; Nature and Environment; marine sediments; submarine fans; bedforms; tectonic setting; faulting; seafloor topography; geophysical surveys; seismic surveys, marine; seismic reflection surveys; depositional environment; depositional cycles; antidunes; flow velocities; submarine canyons; turbidity currents; modelling; hydraulic analyses; Levant Basin
Illustrationsgeoscientific sketch maps; location maps; 3-D images; profiles; seismic profiles; models
ProgramGSC Atlantic GSC Atlantic Division
Released2021 08 30
AbstractTectonically controlled topography influences deep-water sedimentary systems. Using 3-D seismic reflection data from the Levant Basin, eastern Mediterranean Sea, we investigate the spatial and temporal evolution of bedforms on a deep-water fan cut by an active normal fault. In the footwall, the fan comprises cyclic steps and antidunes along its axial and external portions, respectively, which we interpret to result from the spatial variation in flow velocity due to the loss of confinement at the canyon mouth. Conversely, in the hanging wall, the seafloor is nearly featureless at seismic scale. Numerical modeling of turbidity currents shows that the fault triggers a hydraulic jump that suppresses the flow velocity downstream, which thus explains the lack of visible bedforms basinward. This study shows that the topography generated by active normal faulting controls the downslope evolution of turbidity currents and the associated bedforms and that seafloor geomorphology can be used to evince syn-tectonic deposition.
Summary(Plain Language Summary, not published)
Investigation of the role of active tectonics on turbidity current bedform development.

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