Cretaceous–Cenozoic sedimentary budgets of the Southern Mozambique Basin: Implications for uplift history of the South African Plateau

Said, Aymen; Moder, C.; Clark, Stuart; Ghorbal, B.

doi:10.1016/j.jafrearsci.2015.05.007

Cited by 41 publications

(29 citation statements)

References 35 publications

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“…This pattern is seen across eastern, central, and southern Africa and is coeval with a Miocene change from carbonate to clastic sedimentation recorded at most major African deltas (e.g., Anka & Séranne, ; Nyagah, ; Paul et al, ; Reijers, ; Salman & Abdula, ; Sestini, ; Séranne & Nzé Abeigne, ). An increase in Oligocene to Neogene clastic flux is documented at many of Africa's major deltas (e.g., Nile, Jubba‐Shebelle, Zambezi, Limpopo; Figure ; Said et al, ; Walford et al, ). These observations are consistent with the notion that uplift, subsidence, and sedimentary flux to the Mauritanian margin are a manifestation of continent‐wide, punctuated, Cenozoic dynamic support.…”

Section: Discussionmentioning

confidence: 99%

Observation and Simulation of Solid Sedimentary Flux: Examples From Northwest Africa

Lodhia

Fraser

Jarvis³

et al. 2019

Geochem Geophys Geosyst

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The sedimentary archive preserved at passive margins provides important clues about the evolution of continental topography. For example, histories of African uplift, erosion, and deposition of clastic sedimentary rock provide information about mantle convection. Furthermore, relating histories of uplift and erosion from regions where sediment is generated to measurements of efflux is important for understanding basin evolution and the distribution of natural resources. We focus on constraining Mesozoic to Recent solid sedimentary flux to northwest Africa's passive margin, which today is fed by rivers draining dynamically supported topography. Histories of sedimentary flux are calculated by mapping stratigraphy using seismic reflection and well data courtesy of Tullow Oil Plc and TGS. Stratigraphic ages, conversion from two‐way time to depth and compaction, are parameterized using biostratigraphic and check‐shot records from exploration, International Ocean Discovery Program and Deep Sea Drilling Project wells. Results indicate that Late Cretaceous to Oligocene (∼100–23 Ma) sedimentary flux decreased gradually. A slight increase in Neogene sedimentary flux is observed, which is concomitant with a change from carbonate to clastic sedimentation. Pliocene to Recent (∼5–0 Ma) flux increased by an order of magnitude. This history of sedimentary flux and facies change is similar to histories observed at other African deltas. To constrain sources of sedimentary flux, 14,700 longitudinal river profiles were inverted to calculate a history of continental uplift. These results were used to parameterize a simple “source‐to‐sink” model of fluvial erosion and sedimentary efflux. Results suggest that increased clastic flux to Africa's deltas from ∼30 Ma was driven by denudation induced by dynamic support.

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Section: Discussionmentioning

confidence: 99%

Observation and Simulation of Solid Sedimentary Flux: Examples From Northwest Africa

Lodhia

Fraser

Jarvis³

et al. 2019

Geochem Geophys Geosyst

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“…Over the last two decades, high‐resolution seismic data and thermochronology data have improved our understanding of the tectonic and geomorphic evolution of Southern Africa (Baby et al, ; Baby et al, ; Brown et al, ; Guillocheau et al, ; Said et al, ; Stanley et al, ; Tinker et al, ). For example, Hu et al () recently proposed a lithospheric delamination model for the uplift history of southern Africa based on seismic observations and geodynamic modeling.…”

Section: Application To Southern Africamentioning

confidence: 99%

“…(c) Offshore basins of Southern Africa (modified from Braun et al, ). (d) Sediment flux to the Southern Mozambique, Outeniqua, and Orange Basins across the Cretaceous Period (Guillocheau et al, ; Said et al, ; Tinker et al, ). The timing of the subaerial unconformity (SU) is indicated for each basin.…”

Section: Application To Southern Africamentioning

confidence: 99%

Drainage and Sedimentary Responses to Dynamic Topography

Ding

Salles

Flament

et al. 2019

Geophysical Research Letters

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Dynamic topography due to mantle flow contributes to shaping Earth's evolving landscapes by affecting sediment routing, which has rarely been explored in source-to-sink contexts. Here we design a generic model to investigate the impact of dynamic topography on both landscape evolution and stratigraphic formations. An imposed wave of dynamic topography propagates laterally under a fixed continent, exerting transient surface uplift and subsidence. We find that a migrating dynamic topography can induce significant drainage reorganizations and affect sediment routing from source to sink. Variations in sediment supply driven by the lateral migrating dynamic topography contribute to the formation of diachronous unconformities along the margin. The predicted sediment flux histories are then put into perspective with the Cretaceous sedimentary records along the Southern African margins. Finally, we demonstrate that correlating offshore depositional hiatuses and unconformities has the potential to constrain the spatiotemporal evolution of past dynamic topography events. Plain Language Summary Convective motion within Earth's interior result in transient upliftand subsidence of the surface is called dynamic topography. This process slowly shapes landscapes over millions of years and identifying its fingerprints in the rock record remains a challenge. This study uses numerical modeling to investigate the erosional and depositional response of landscapes to sea level change and to mantle flow. We show that unlike sea level change, dynamic topography reorganizes river flows and changes sediment supply to offshore regions, generating various stratal patterns. We model a simple circular landscape that evolves similarly to the southern African landscape between 140 and 66 million years ago and suggest sedimentary fingerprints to link the evolution of the Earth's surface to the dynamics of its deep interior.

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“…2), which led to increased sediment material transport. Contemporaneous increases in sedimentation rates in other southern African margin depocentres (e.g., Orange River Delta (Rouby et al 2009), Outeniqua Basin (Tinker et al 2008) and Limpopo Delta (Said et al 2015)) are also attributed to Late Cretaceous uplift. In Namibia, up to 1 km on the Atlantic margin and 4.5 km inland have been eroded (Wildman et al 2016).…”

Section: Discussionmentioning

confidence: 99%

“…After the marine regression phase, sediment input into the basin was revived by renewed elevation of African surface topography by 150-300 m during the Miocene (Burke 1996;Burke and Gunnell 2008;Castelino et al 2015;Partridge and Maud 1987;Walford et al 2005). Uplift along the Ovambo-Kalahari-Zimbabwe Axis rejuvenated the southern African drainage network, initiating a new cycle of erosion in the continental interior and accompanying increased sediment discharge in the Limpopo and Congo deltas (Moore et al 2009;Roberts and White 2010;Said et al 2015). On the Mozambique Fan, too, topset reflector patterns and welldeveloped clinoforms at the shelf edge indicate an increase in sediment supply and accommodation space by subsidence and sediment compaction (Fig.…”

Section: Oligocene-miocene Turbidite System Over Beira Highmentioning

confidence: 99%

Response of Cenozoic turbidite system to tectonic activity and sea-level change off the Zambezi Delta

2017

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Cretaceous–Cenozoic sedimentary budgets of the Southern Mozambique Basin: Implications for uplift history of the South African Plateau

Cited by 41 publications

References 35 publications

Observation and Simulation of Solid Sedimentary Flux: Examples From Northwest Africa

Observation and Simulation of Solid Sedimentary Flux: Examples From Northwest Africa

Drainage and Sedimentary Responses to Dynamic Topography

Response of Cenozoic turbidite system to tectonic activity and sea-level change off the Zambezi Delta

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