Physics
Scientific paper
Oct 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9919947w&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. B10, p. 19,947-19,974
Physics
17
Compression Loads, Deformation, Ductile-Brittle Transition, Earth Crust, Earth Surface, Mountains, Temperature Dependence, Topography, Venus Surface, Andes Mountains (South America), Correlation, Mathematical Models, Predictions
Scientific paper
The Coulomb critical taper model has been very successful in explaining the large-scale topography of a number of terrestrial accretionary wedges; however, this model is limited to cases of purely brittle-frictional deformation. In this paper we extend te range of applicability of the critical taper model by explicity including the effects of temperature-dependent ductile deformation. The new model includes temperature-dependent power law flow, an assumed velocity field, and linear thermal gradients in the atmosphere and within the crust. Flexural isostasy is also incorporated so that the decollement geometry is computed as a response to the applied load of the wedge material. We assume that ductile deformation within the wedge itself is controlled primarily by duffusin flow, whereas ductile deformation within the wedge itself is controlled by dislocation creep. We have applied the model to two fold-and-thrust belts on Venus (Maxwell Montes and Uorsar Rypes) and to the Andes on Earth, and we find good agreement between observed and predicted topography using reasonable parameter values. The model accounts for the observed positive correlation between relief and elevation of Venusian fold-and-thrust belts on the basis of different thermal environments at different elevations. It is also able to explain the first-order difference between terrestrial and Venusian fold-and-thrust belts; fundamentally, this difference is due to a combination of the lower temperatures and the presence of water on Earth.
Connors Chris
Dahlan F. A.
Price Evelyn J.
Suppe John
Williams Charles A.
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