The Zambezi delta (Mozambique channel, East Africa): High resolution dating combining bio- orbital and seismic stratigraphies to determine climate (palaeoprecipitation) and tectonic controls on a passive margin

Ponte, Jean-Pierre; Robin, Cécile; Guillocheau, François; Popescu, Speranta‐Maria; Suc, Jean‐Pierre; Dall’Asta, Massimo; Melinte‐Dobrinescu, Mihaela Carmen; Bubík, Miroslav; Dupont, G.; Gaillot, Jérémie

doi:10.1016/j.marpetgeo.2018.07.017

Cited by 41 publications

(62 citation statements)

References 120 publications

(128 reference statements)

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“…The PAMELA results present a far more complex and dynamic picture of the channel's bathymetric and topographic evolution than previously envisioned. Magmatic data were analysed by Courgeon et al (2016Courgeon et al ( , 2017Courgeon et al ( , 2018 and Leroux et al (2020), while other studies focussed on sedimentology (Baby et al, 2018;Delaunay, 2018;Ponte, 2018;Ponte et al, 2019), geodynamics and tectonics (Moulin et al, 2020;Thompson et al, 2019).…”

Section: Testing Ali and Huber's (2010) Model Of Enhanced Transoceamentioning

confidence: 99%

“…Magmatic data were analysed by Courgeon et al (2016, 2017, 2018) and Leroux et al. (2020), while other studies focussed on sedimentology (Baby et al., 2018; Delaunay, 2018; Ponte, 2018; Ponte et al., 2019), geodynamics and tectonics (Moulin et al., 2020; Thompson et al., 2019). We synthesized these results to reconstruct four palaeogeographic snapshots of the channel's evolution using the PLACA4D freeware interactive tool for palinspastic reconstruction in 3D (Matias et al., 2005; Pelleau et al., 2015; Figure 4).…”

Section: Palaeogeography and Vertical Movements In The Western Indianmentioning

confidence: 99%

“…Past and present physiographic maps of the Mozambique Channel. The palaeomaps are compilations of recent studies (Baby et al., 2018; Courgeon et al., 2017; Delaunay, 2018; Leroux et al., 2020; Ponte, 2018; Ponte et al., 2019). Observations indicate three episodes of subaerial exposure: (a) Late Cretaceous–Early Palaeocene (66–60 Ma), (b) latest Eocene–Rupelian (36–30 Ma), (c) Late Serravallian–Messinian (12–05 Ma), while (d) shows present‐ the top left hand corners of a, b and c may have colonized Madagascar at this time…”

Section: Palaeogeography and Vertical Movements In The Western Indianmentioning

confidence: 99%

“…After the Madagascar plate stopped moving south, the Davie Ridge played a crucial role in the morphology of the domain. A consistently low record of sedimentation (low deposition and/or low preservation due to erosion) between 120 and 23 Ma (Delaunay, 2018; Ponte et al., 2019) indicates either the presence of a relatively consistent topographic high, or deposition–erosion sequences. Drowned Miocene carbonate platforms are characterized by well‐developed karstic topographies, which suggest extended periods of subaerial exposure and include volcanoclastic deposits typified by armoured lapilli and carbonate fragments that indicate the occurrence of shallow to subaerial phreatomagmatic explosions (Courgeon et al, 2016, 2017, 2018).…”

Section: Palaeogeography and Vertical Movements In The Western Indianmentioning

confidence: 99%

“…To understand the effects of these events, the PAMELA (Passive Margins Exploration Laboratories) research programme undertook sedimentary, tectonic, volcanic, kinematic and palaeo-environmental studies of Mozambique and Madagascar, covering the F I G U R E 4 Past and present physiographic maps of the Mozambique Channel. The palaeomaps are compilations of recent studies(Baby et al, 2018;Courgeon et al, 2017;Delaunay, 2018;Leroux et al, 2020;Ponte, 2018;Ponte et al, 2019). Observations indicate three episodes of subaerial exposure: (a) Late Cretaceous-Early Palaeocene(66-60 Ma), (b) latest Eocene-Rupelian (36-30 Ma), (c) Late Serravallian-Messinian (12-05 Ma), while (d) shows present-day bathymetry.…”

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confidence: 99%

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Biogeographic mechanisms involved in the colonization of Madagascar by African vertebrates: Rifting, rafting and runways

Masters

Génin

Zhang

et al. 2020

Journal of Biogeography

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Aim: For 80 years, popular opinion has held that most of Madagascar's terrestrial vertebrates arrived from Africa by transoceanic dispersal (i.e. rafting or swimming). We reviewed this proposition, focussing on three ad hoc hypotheses proposed to render this unlikely scenario more feasible: (a) Could hibernation have helped mammals to reach Madagascar? (b) Could the aquatic abilities of hippopotamuses have enabled them to swim the Mozambique Channel? (c) How valid is the Ali-Huber model predicting that eastward Palaeogene surface currents allowed rafts to reach Madagascar in 3-4 weeks? Finally, we explored the alternative hypothesis of geodispersal via short-lived land bridges between Africa and Madagascar.

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Section: Testing Ali and Huber's (2010) Model Of Enhanced Transoceamentioning

confidence: 99%

Section: Palaeogeography and Vertical Movements In The Western Indianmentioning

confidence: 99%

Section: Palaeogeography and Vertical Movements In The Western Indianmentioning

confidence: 99%

Section: Palaeogeography and Vertical Movements In The Western Indianmentioning

confidence: 99%

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confidence: 99%

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Biogeographic mechanisms involved in the colonization of Madagascar by African vertebrates: Rifting, rafting and runways

Masters

Génin

Zhang

et al. 2020

Journal of Biogeography

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Linking uplift, erosion, and sedimentation using landscape evolution models: Madagascar since the Late Cretaceous

Jiao

Braun

Delaunay

et al. 2022

Earth Surf Processes Landf

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We present a study to estimate the large-scale landscape history of a continental margin, by establishing a source-to-sink volume balance between the eroding onshore areas and the offshore basins. Assuming erosion as the primary process for sediment production, we strive to constrain a numerical model of landscape evolution that balances the volumes of eroded materials from the continent and that deposited in the corresponding basins, with a ratio imposed for loss of erosion products. We use this approach to investigate the landscape history of Madagascar since the Late Cretaceous. The uplift history prescribed in the model is inferred from elevations of planation surfaces formed at various ages. By fitting the volumes of terrigenous sediments in the Morondava Basin along the west coast and the current elevation of the island, the landscape evolution model is optimized by constraining the erosion law parameters and ratios of sediment loss. The results include a best-fit landscape evolution model, which features two major periods of uplift and erosion during the Late Cretaceous and the middle to late Cenozoic. The model supports suggestions from previous studies that most of the high topography of the island was constructed since the middle to late Miocene, and on the central plateau the erosion has not reached an equilibrium with the high uplift rates in the late Cenozoic. Our models also indicate that over the geological time scale, a significant portion of materials eroded from Madagascar was not archived in the offshore basin, possibly consumed by chemical weathering, the intensity of which might have varied with climate.

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Dry Valleys (Mekgacha)

Nash

2022

Landscapes and Landforms of Botswana

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Conventional rivers are absent from much of Botswana, with only the Okavango, Chobe and Zambezi systems in the extreme north containing perennial flowing water. Ephemeral rivers occur in the eastern hardveld, but the most extensive components of the surface drainage are the networks of fossil or dry valleys (termed mekgacha in Setswana and dum in various San languages) that cross the sandveld. This chapter presents the first holistic review of current knowledge about these enigmatic landforms. It does so using a range of evidence types, from radar remote-sensing to the analysis of historical documents written by missionaries and explorers. The chapter considers dry valley distribution, morphology, and contemporary and historical hydrology before discussing valley evolution over longer timescales. It concludes with a synthesis of the main arguments concerning how dry valley systems may have formed, including the balance between conventional fluvial incision and processes such as groundwater seepage erosion.

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The Zambezi delta (Mozambique channel, East Africa): High resolution dating combining bio- orbital and seismic stratigraphies to determine climate (palaeoprecipitation) and tectonic controls on a passive margin

Cited by 41 publications

References 120 publications

Biogeographic mechanisms involved in the colonization of Madagascar by African vertebrates: Rifting, rafting and runways

Biogeographic mechanisms involved in the colonization of Madagascar by African vertebrates: Rifting, rafting and runways

Linking uplift, erosion, and sedimentation using landscape evolution models: Madagascar since the Late Cretaceous

Dry Valleys (Mekgacha)

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