| Titre | Seismic stratigraphy and deep-water sedimentary evolution of the southern Mozambique margin: Central Terrace and Mozambique Fracture Zone |
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| Auteur | Gao, Y; Stow, D; Tang, Y; Xie, X; Piper, D J W |
| Source | Marine Geology vol. 427, 106187, 2020 p. 1-18, https://doi.org/10.1016/j.margeo.2020.106187 |
| Image |  |
| Année | 2020 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20200084 |
| Éditeur | Elsevier Ltd. |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1016/j.margeo.2020.106187 |
| Media | papier; en ligne; numérique |
| Formats | pdf; html |
| Région | Mozambique Channel |
| Lat/Long OENS | 30.0000 49.0000 -14.0000 -36.0000 |
| Sujets | levés géophysiques; levés sismiques marins; levés de reflexion sismiques; interpretations sismiques; évolution géologique; marges continentales; talus continental; plate-forme continentale; évolution
géologique; milieu sédimentaire; sedimentation; glissements de terrain; fluage; caractéristiques sous-marines; canyons sous-marins; terrasses sous-marines; cônes sous-marins; structures sédimentaires; géologie du substratum rocheux; caractéristiques
structurales; zones de fracture; plis; courants de fond; température de l'eau; salinité; analyses stratigraphiques; Néogène; Miocène; Paléogène; Eocene; Paléocène; géologie marine; stratigraphie; sédimentologie; géophysique; Sciences et technologie;
Nature et environnement; Phanérozoïque; Cénozoïque; Tertiaire; Mésozoïque; Crétacé |
| Illustrations | cartes de localisation; cartes géolscientiques généralisées; profils; tableaux; coupes sismiques; profils sismiques; modèles 3D |
| Diffusé | 2020 04 27 |
| Résumé | (disponible en anglais seulement)
Based 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. |
| GEOSCAN ID | 326164 |
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