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TitleSeismic stratigraphy and deep-water sedimentary evolution of the southern Mozambique margin: Central Terrace and Mozambique Fracture Zone
AuthorGao, Y; Stow, D; Tang, Y; Xie, X; Piper, D J WORCID logo
SourceMarine Geology vol. 427, 106187, 2020 p. 1-18,
Alt SeriesNatural Resources Canada, Contribution Series 20200084
PublisherElsevier Ltd.
Mediapaper; on-line; digital
File formatpdf; html
AreaMozambique Channel; Mozambique
Lat/Long WENS 30.0000 49.0000 -14.0000 -36.0000
Subjectsmarine geology; stratigraphy; sedimentology; geophysics; Science and Technology; Nature and Environment; geophysical surveys; seismic surveys, marine; seismic reflection surveys; seismic interpretations; geological evolution; continental margins; continental slope; continental shelf; geological evolution; depositional environment; sedimentation; landslides; creep; submarine features; submarine canyons; submarine terraces; submarine fans; sedimentary structures; bedrock geology; structural features; fracture zones; folds; bottom currents; water temperature; salinity; stratigraphic analyses; Neogene; Miocene; Paleogene; Eocene; Paleocene; Central Terrace; Mozambique Margin; Mozambique Fracture Zone; Mozambique Basin; Limpopo Cone; Mozambique Ridge; Inharrime Terrace; Phanerozoic; Cenozoic; Tertiary; Mesozoic; Cretaceous
Illustrationslocation maps; geoscientific sketch maps; profiles; tables; seismic sections; seismic profiles; 3-D models
Released2020 04 27
AbstractBased upon new seismic reflection data, this study reveals the development of a complex sedimentary system on the lower-slope terrace off Maputo on the southern Mozambique margin. The deep-water sedimentary system clearly shows the interaction of downslope and alongslope processes. Downslope features include: a pronounced canyon, slope creep, submarine slides, and multi-stage mass-transport deposits. Alongslope features include: contourite drifts and sediment waves, erosional moats, valleys, erosive surfaces and a distinctive contourite terrace. We show an evolution through time as follows: (1) restricted marine sedimentation during the Early Cretaceous after the initial break-up, with slope progradational clinoforms and hemipelagite drape developed; (2) open marine sedimentation characterized by the onset of alongslope sedimentary processes during the Late Cretaceous and development of a contourite depositional system; (3) downslope gravity processes dominated sedimentation during the Paleocene-Eocene, including development of a canyon and submarine fan; and (4) an alongslope contourite depositional system was re-established on the lower slope in the Middle Miocene, while turbidites (from a northern source) covered the Mozambique Basin. The Mozambique Fracture Zone marks a distinct and steep slope seaward of the contourite terrace, and has significantly influenced both contourite and turbidite deposition. Our study provides new insights into the onset and evolution of bottom current control on margin sedimentation, the interaction of downslope and alongslope processes and how these processes have jointly sculpted this part of the southern Mozambique margin.

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