Combining low temperature apatite thermochronology and cosmogenic isotope analysis in quantitative
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Roderick Brown, Hermione Cockburn, Barry Kohn, David Belton, David Fink, Andrew Gleadow PowerPoint PPT Presentation


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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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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


Conceptual landscape

evolution models


van der Beek et al. (2002)

Numerical landscape evolution models


Numerical landscape evolution models


Numerical landscape evolution models


Southern Africa


Drakensberg Escarpment


Landsat ETM+ 321RGB Image


Drakensberg Escarpment, Sani Pass


Sani Top

Photograph by Alastair Fleming


Apatite Fission Track Age


Estimated Palaeogeothermal Gradients


Atlantic Margin, Namibia


Gamsberg Escarpment, ASTER VNIR Image


Gamsberg Plateau, ASTER VNIR Image


Photograph by Hermione Cockburn

Gamsberg Escarpment


Photograph by Hermione Cockburn

Gamsberg Escarpment


Gamsberg Plateau Transect


Gamsberg Escarpment Transect


South Eastern Australia


South Eastern Australia, 300m DEM


Brown Mountain Transect

50 km


Denudation since 110 Ma


Denudation since 65 Ma


Apatite U-Th/He Ages


Paired Apatite FT & He Ages


Apatite FT & U-Th/He Ages


Age of continental rifting


ANTARES Detector Array, ANSTO, Australia


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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