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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Roderick brown hermione cockburn barry kohn david belton david fink andrew gleadow

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


Roderick brown hermione cockburn barry kohn david belton david fink andrew gleadow

Conceptual landscape

evolution models


Roderick brown hermione cockburn barry kohn david belton david fink andrew gleadow

van der Beek et al. (2002)

Numerical landscape evolution models


Roderick brown hermione cockburn barry kohn david belton david fink andrew gleadow

Numerical landscape evolution models


Roderick brown hermione cockburn barry kohn david belton david fink andrew gleadow

Numerical landscape evolution models


Roderick brown hermione cockburn barry kohn david belton david fink andrew gleadow

Southern Africa


Roderick brown hermione cockburn barry kohn david belton david fink andrew gleadow

Drakensberg Escarpment


Roderick brown hermione cockburn barry kohn david belton david fink andrew gleadow

Landsat ETM+ 321RGB Image


Roderick brown hermione cockburn barry kohn david belton david fink andrew gleadow

Drakensberg Escarpment, Sani Pass


Roderick brown hermione cockburn barry kohn david belton david fink andrew gleadow

Sani Top

Photograph by Alastair Fleming


Roderick brown hermione cockburn barry kohn david belton david fink andrew gleadow

Apatite Fission Track Age


Roderick brown hermione cockburn barry kohn david belton david fink andrew gleadow

Estimated Palaeogeothermal Gradients


Roderick brown hermione cockburn barry kohn david belton david fink andrew gleadow

Atlantic Margin, Namibia


Roderick brown hermione cockburn barry kohn david belton david fink andrew gleadow

Gamsberg Escarpment, ASTER VNIR Image


Roderick brown hermione cockburn barry kohn david belton david fink andrew gleadow

Gamsberg Plateau, ASTER VNIR Image


Roderick brown hermione cockburn barry kohn david belton david fink andrew gleadow

Photograph by Hermione Cockburn

Gamsberg Escarpment


Roderick brown hermione cockburn barry kohn david belton david fink andrew gleadow

Photograph by Hermione Cockburn

Gamsberg Escarpment


Roderick brown hermione cockburn barry kohn david belton david fink andrew gleadow

Gamsberg Plateau Transect


Roderick brown hermione cockburn barry kohn david belton david fink andrew gleadow

Gamsberg Escarpment Transect


Roderick brown hermione cockburn barry kohn david belton david fink andrew gleadow

South Eastern Australia


Roderick brown hermione cockburn barry kohn david belton david fink andrew gleadow

South Eastern Australia, 300m DEM


Roderick brown hermione cockburn barry kohn david belton david fink andrew gleadow

Brown Mountain Transect

50 km


Roderick brown hermione cockburn barry kohn david belton david fink andrew gleadow

Denudation since 110 Ma


Roderick brown hermione cockburn barry kohn david belton david fink andrew gleadow

Denudation since 65 Ma


Roderick brown hermione cockburn barry kohn david belton david fink andrew gleadow

Apatite U-Th/He Ages


Roderick brown hermione cockburn barry kohn david belton david fink andrew gleadow

Paired Apatite FT & He Ages


Roderick brown hermione cockburn barry kohn david belton david fink andrew gleadow

Apatite FT & U-Th/He Ages


Roderick brown hermione cockburn barry kohn david belton david fink andrew gleadow

Age of continental rifting


Roderick brown hermione cockburn barry kohn david belton david fink andrew gleadow

ANTARES Detector Array, ANSTO, Australia


Roderick brown hermione cockburn barry kohn david belton david fink andrew gleadow

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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