Sunday, November 23, 2014
   
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Research

Denudation Chronology of Namibia's Passive Margin

Surface processes, and the spatial variation of denudation in particular, are key issues in understand long-term surface evolution of a passive margin.

This article shows how to convert thermal history information from a large apatite fission track data set from Namibia into

  1. Palaeotemperature-,
  2. Denudation-, and
  3. Palaeotopography-

maps to achieve and visualise quantitative information of the denudation chronology of the passive continental margin of central Namibia. Watch three animated QuickTime movies to see Namibia's margin evolving.

Read more: Denudation Chronology of Namibia's Passive Margin

 

Publications

Peer reviewed:

Belton, D. X., Raab, M. J. (2010), Cretaceous reactivation and intensified erosion in the Archean-Proterozoic Limpopo Belt, demonstrated by apatite fission track thermochronology, Tectonophysics, 480, 99-108, doi: 10.1016/j.tecto.2009.09.018 [download pdf 1 MB]

Raab, M. J., R. W. Brown, K. Gallagher, K. Weber, and A. J. W. Gleadow (2005), Denudational and thermal history of the Early Cretaceous Brandberg and Okenyenya igneous complexes on Namibia’s Atlantic passive margin, Tectonics, Vol. 24, TC3006, doi:10.1029/2004TC001688.
[download pdf 1 MB]

Read more: Publications

 

Thermotectonic Evolution of Central Namibia

Abstract of PhD Thesis "The Geomorphic Response of the Passive Continental Margin of Northern Namibia to Continental Break-Up and Global Scale Tectonics" by Dr Matthias Raab. A fission track study of central and northern Namibia.

Apatite fission track thermochronology data provide an independent and direct constraint on the spatial and temporal variations of denudation in onshore regions. The method allows the identification of major eroding source areas over time. With this information, a record of the cooling history can be established, potentially identifying offsets across major structures, as well as important periods of accelerated denudation and their distribution along the continental margin. Moreover, if vertical relief profiles are available, a palaeogeothermal gradient can be reconstructed.

Read more: Thermotectonic Evolution of Central Namibia

   

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