Late Pliocene climate changes documented in seismic and palynology data at the southwest African Margin

Weigelt, Estella; Dupont, Lydie M; Uenzelmann-Neben, Gabriele

doi:10.1016/j.gloplacha.2008.05.001

Cited by 2 publications

(1 citation statement)

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“…The maximum of accumulation occurred during the late Pleistocene (Stokes et al, 1997) or 120,000 BP (Kinabo et al, 2007). Thus the rift system is older than 120,000 yr and probably active during the Pliocene during an arid period (Weigelt et al, 2008).…”

Section: Deformations Of the South-african Plateaumentioning

confidence: 94%

The Fish River canyon (Southern Namibia): A record of Cenozoic mantle dynamics?

Mvondo

Dauteuil

Guillocheau

2011

Comptes Rendus. Géoscience

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Intracontinental elevated plateaus remain geomorphologic features which are poorly studied. Their genesis requires a coupling between climate and deformation. The Fish River canyon (southern Namibia), the second largest canyon of the Earth, carved the South-African plateau on 550 m along 65 km. This study reveals that the upper and the lower segments are shaped by NE-SW and north-south grabens, respectively. These deformations increased the meandering and the vertical incision mainly in the lower canyon. However the river main trend was not drastically modified attesting that the river was ancient and that the rate of the vertical displacement was slow compared to the erosion rate. The main incision occurred during a NW-SE stretching of Plio-Pleistocene. These stretching episodes belong to two deformation phases previously poorly described in the South-African plateau. These widespread stretching phases are interpreted as a result of deep mantle dynamics affecting the inner African continent.ß 2011 Published by Elsevier Masson SAS on behalf of Acade ´mie des sciences. R E ´S U M E Ĺesplateaux intracontinentaux e ´leve ´s sont des objets ge ´omorphologiques peu e ´tudie ´s. Leur formation re ´sulte d'un couplage subtil entre climat et de ´formation. Le canyon de la rivie `re Fish (Sud Namibie) a creuse ´le plateau sur 550 m le long de 65 km. Cette e ´tude re ´ve `le que les parties supe ´rieure et infe ´rieure du canyon sont structure ´es par des grabens respectivement NE-SW et nord-sud. Ces de ´formations ont permis le de ´veloppement de me ´andres et d'une incision verticale, notamment dans la partie infe ´rieure du canyon. Cependant, le cours principal de la rivie `re n'a pas e ´te ´modifie ´attestant que la rivie `re est ancienne et que le taux du de ´placement vertical a e ´te ´lent par rapport au taux de l'e ´rosion. L'incision principale s'est produite au cours d'un e ´tirement NW-SE du Plio-Ple ´istoce `ne. Ces e ´pisodes appartiennent a `deux phases de de ´formation mal de ´crites sur le plateau sudafricain et sont interpre ´te ´s comme un re ´sultat de la dynamique du manteau profond.ß 2011 Publie ´par Elsevier Masson SAS pour l'Acade ´mie des sciences.

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Section: Deformations Of the South-african Plateaumentioning

confidence: 94%