Characterization of blocks within a near seafloor Neogene MTC, Orange Basin: Constraints from a high-resolution 3D seismic data

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dc.contributor.authorAmaechi, Paschal Ogechukwu
dc.contributor.authorWaldmann, Nicolas David
dc.contributor.authorMakovsky, Yizhaq
dc.date.accessioned2023-03-28T10:25:05Z
dc.date.available2023-03-28T10:25:05Z
dc.date.issued2023
dc.description.abstractSubmarine mass wasting processes in deepwater settings can incorporate large blocks, which may play a key role in deepwater geological processes and geohazard assessment. However, there is a limited understanding of the deformation style arising from the interaction between submarine blocks and structural/bathymetric barriers such as ramps. The deformation and kinematic history of several submarine blocks (with a thickness of up to 150 m) within a near seafloor mass transport complex in the Orange Basin are documented using seismic geo- morphic methods. The interpreted blocks are preserved in three discrete fault-bounded morphological terrains within a Neogene mass-transport complex. These terrains vary in lengths from 2 km to 6 km; they have heights of 60 m to 150 m and are characterized by discrete and localized structural highs on the present-day seafloor. Block sizes vary across terrains suggesting differences in the block evolution process. Blocks near the ramp appear in seismic profiles comprising (a) Chaotic and transparent seismic reflections and (b) parallel to sub-parallel, continuous, low to moderate amplitude reflections. This variability in seismic facies of the blocks reflects the de- gree of their interaction and translation over a ramp at the basal shear zone of the mass transport complex, ev- idenced by the difference in the block features on the upslope portion of the ramp versus the downslope part. Notably, the deformation styles recorded in the blocks show the impact of the ramp during mass flow, which has broader implications for understanding the internal mechanisms of blocky mass transport complexes in many continental margins.en_US
dc.identifier.citationAmaechi, P. O. et al. (2023). Characterization of blocks within a near seafloor Neogene MTC, Orange Basin: Constraints from a high-resolution 3D seismic data. Sedimentary Geology, 444, 106319. https://doi.org/10.1016/j.sedgeo.2022.106319en_US
dc.identifier.issn1879-0968
dc.identifier.urihttps://doi.org/10.1016/j.sedgeo.2022.106319
dc.identifier.urihttp://hdl.handle.net/10566/8680
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.subjectMarine scienceen_US
dc.subjectGeologyen_US
dc.subjectSubmarine blocksen_US
dc.subjectOrange Basinen_US
dc.titleCharacterization of blocks within a near seafloor Neogene MTC, Orange Basin: Constraints from a high-resolution 3D seismic dataen_US
dc.typeArticleen_US

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