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Roderick Brown, Hermione Cockburn, Barry Kohn, David Belton, David Fink, Andrew Gleadow

Combining low temperature apatite thermochronology and cosmogenic isotope analysis in quantitative landscape evolution studies. Roderick Brown, Hermione Cockburn, Barry Kohn, David Belton, David Fink, Andrew Gleadow and Michael Summerfield. The University of Melbourne

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Roderick Brown, Hermione Cockburn, Barry Kohn, David Belton, David Fink, Andrew Gleadow

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  1. Combining low temperature apatite thermochronology and cosmogenic isotope analysis in quantitativelandscape evolution studies Roderick Brown, Hermione Cockburn, Barry Kohn, David Belton, David Fink, Andrew Gleadow and Michael Summerfield The University of Melbourne Australian Nuclear Science & Technology Organisation The University of Edinburgh

  2. Conceptual landscape evolution models

  3. van der Beek et al. (2002) Numerical landscape evolution models

  4. Numerical landscape evolution models

  5. Numerical landscape evolution models

  6. Southern Africa

  7. Drakensberg Escarpment

  8. Landsat ETM+ 321RGB Image

  9. Drakensberg Escarpment, Sani Pass

  10. Sani Top Photograph by Alastair Fleming

  11. Apatite Fission Track Age

  12. Estimated Palaeogeothermal Gradients

  13. Atlantic Margin, Namibia

  14. Gamsberg Escarpment, ASTER VNIR Image

  15. Gamsberg Plateau, ASTER VNIR Image

  16. Photograph by Hermione Cockburn Gamsberg Escarpment

  17. Photograph by Hermione Cockburn Gamsberg Escarpment

  18. Gamsberg Plateau Transect

  19. Gamsberg Escarpment Transect

  20. South Eastern Australia

  21. South Eastern Australia, 300m DEM

  22. Brown Mountain Transect 50 km

  23. Denudation since 110 Ma

  24. Denudation since 65 Ma

  25. Apatite U-Th/He Ages

  26. Paired Apatite FT & He Ages

  27. Apatite FT & U-Th/He Ages

  28. Age of continental rifting

  29. ANTARES Detector Array, ANSTO, Australia

  30. Conclusions Combined thermochronologic and cosmogenic datasets are capable of quantifying passive margin escarpment retreat rates Measured denudation rates and chronologies for the Gamsberg, Drakensberg and Brown Mountain escarpments are incompatible with a steady, parallel retreat model A viable alternative model involves the establishment of an escarpment at a major inland drainage divide with moderate to low subsequent retreat rates

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