Cenozoic deformation of the South African plateau, Namibia: Insights from planation surfaces

Picart, Carole; Dauteuil, Olivier; Pickford, Martin; Owono, François Mvondo

doi:10.1016/j.geomorph.2019.106922

Cited by 12 publications

(5 citation statements)

References 80 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Carbonate‐cemented sediments could be anything from Middle–Upper Miocene, the biostratigraphically constrained age of the oldest calcrete (i.e., Calc‐crust 1 of Pickford (2015)) to Holocene, with multiple periods of carbonate precipitation likely. Accordingly, the fault scarps studied here may have initiated at any point in the last ∼15 Ma, which is compatible with Early Miocene age estimates for the major planation surface that dominates the in‐land Tsau ‖Khaeb National Park and is displaced across the faults (planation surface S6 of Picart et al., 2020).…”

Section: Geological and Geomorphological Settingsupporting

confidence: 86%

“…Following the significant km‐scale accelerated Cretaceous erosion during and post‐dating Gondwana breakup revealed through low temperature thermochonometry (Brown et al., 1990; Raab et al., 2005; Wildman et al., 2021), southern Namibia entered a prolonged phase of relative tectonic quiescence, landscape stability, and slow erosion rates, evidenced by the presence of ancient (estimated up to 40 Ma) erosional land‐surfaces (Picart et al., 2020) and cosmogenic nuclide measurements that indicate an erosion rate of, for example, 8 m/Myrs (Bierman & Caffee, 2001; Cockburn et al., 2000).…”

Section: Geological and Geomorphological Settingmentioning

confidence: 99%

See 1 more Smart Citation

Exceptional Scarp Preservation in SW Namibia Reveals Geological Controls on Large Magnitude Intraplate Seismicity in Southern Africa

et al. 2023

View full text Add to dashboard Cite

Namibia (and SW Africa in general) is considered to be a stable continental region (SCR) with little history of significant earthquakes. Within Namibia, instrumentally recorded earthquakes are restricted to smaller than M w 5.5 (ISC, 2022, Figure 1). Earthquakes recorded in international catalogs reveal a band of seismicity along the west coast within the Namaqua-Natal and Damara belts (Figure 1a, inset). In contrast, the region underlain by the Proto-Kalahari craton appears largely aseismic. Limited network coverage prevents the confident identification of clusters of microseismicity and long-term Global Positioning System (GPS) constraints on strain rates are also

show abstract

Section: Geological and Geomorphological Settingsupporting

confidence: 86%

Section: Geological and Geomorphological Settingmentioning

confidence: 99%

Exceptional Scarp Preservation in SW Namibia Reveals Geological Controls on Large Magnitude Intraplate Seismicity in Southern Africa

et al. 2023

View full text Add to dashboard Cite

show abstract

“…More commonly, qualitative dating relies on ascribing relative age ranges based on the vertical position and geometries of different surfaces and their relationships to any available well-dated geological markers (e.g. Picart et al, 2020). Based on the geometries of the surfaces Picart et al (2020) conclude that a longwavelength bulging occurred during the Oligocene.…”

Section: Discussionmentioning

confidence: 99%

“…Egholm et al., 2017; Green et al., 2013; Pedersen et al., 2016). Recent work has revised the identification and classification of African planation surfaces and other geomorphic features (see Dauteuil et al., 2015; Guillocheau et al., 2018; Picart et al., 2020). The prevailing climate conditions drives the erosion and/or weathering process that formed a particular landform, while tectonic processes affect the geometry of the surfaces.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

From sink to source: Using offshore thermochronometric data to extract onshore erosion signals in Namibia

et al. 2021

View full text Add to dashboard Cite

Products of onshore passive continental margin erosion are best preserved in offshore sedimentary basins. Therefore, these basins potentially hold a recoverable record of the onshore erosion history. Here, we present apatite fission track (AFT) data for 13 samples from a borehole in the southern Walvis basin, offshore Namibia. All samples show AFT central ages older or similar to their respective stratigraphic ages, while many single grain ages are older, implying none of the samples has been totally annealed post-deposition. Furthermore, large dispersion in single grain ages in some samples suggests multiple age components related to separate source regions. Using Bayesian mixture modelling we classify single grain ages from a given sample to particular age components to create 'subsamples' and then jointly invert the entire dataset to obtain a thermal history. For each sample, the post-depositional thermal history is required to be the same for all age components, but each component ('subsample') has an independent pre-depositional thermal history. With this approach we can resolve pre-and post-depositional thermal events and identify changes in sediment provenance in response to the syn-and post-rift tectonic evolution of Namibia and southern Africa. Apatite U-Pb and compositional data obtained during the acquisition of LA-ICP-MS FT data are also presented to help track changes in provenance with time. We constrain multiple thermal events linked to the exhumation and burial history of the continental and offshore sectors of the margin over a longer timescale than has been possible using only onshore AFT thermochronological data.

show abstract

Long-Term Denudation and Geomorphology in Scotland

Hall

2021

World Geomorphological Landscapes

View full text Add to dashboard Cite

Cenozoic deformation of the South African plateau, Namibia: Insights from planation surfaces

Cited by 12 publications

References 80 publications

Exceptional Scarp Preservation in SW Namibia Reveals Geological Controls on Large Magnitude Intraplate Seismicity in Southern Africa

Exceptional Scarp Preservation in SW Namibia Reveals Geological Controls on Large Magnitude Intraplate Seismicity in Southern Africa

From sink to source: Using offshore thermochronometric data to extract onshore erosion signals in Namibia

Long-Term Denudation and Geomorphology in Scotland

Contact Info

Product

Resources

About