HR: 16:15h
AN: T32F-02 [PDF]
TI: River transport effects on orogen development: results from a new analogue-numerical modeling
technique
AU: * Garcia-Castellanos, D
EM: gard@geo.vu.nl
AF: ISES, Faculty of Earth and Life Sciences, Free University Amsterdam, De Boelelaan 1085, Amsterdam,
1081HV
Netherlands
AU: Sokoutis, D
EM: sokd@geo.vu.nl
AF: ISES, Faculty of Earth and Life Sciences, Free University Amsterdam, De Boelelaan 1085, Amsterdam,
1081HV
Netherlands
AU: Persson, K
EM: katarina.persson@geo.uu.se
AF: Department of Earth Sciences, Geodynamics and Tectonics, University of Uppsala, Uppsala, S75236
Sweden
AB:
Erosion, deposition and tectonic processes interact to define the style of deformation in compressional belts. We introduce a
method of integrating a numerical model for surface transport with analogue models (e.g., sandbox) of compressional belts to
further improve our understanding of this interplay. The analogue model provides the numerical model with the tectonic
changes in topography whereas the numerical model calculates the river network and the amount of erosion and sediment
transport. Compared to previous analogue models with uniform (2D) erosion, this method provides a tool to incorporate
process-based rates of erosion and deposition with spatial distributions that depend on the river network developing on the
evolving topography.
The results show that rivers running parallel to the evolving mountain belt induce along-strike changes in erosion and
deposition that in turn can result in along-strike changes in tectonic deformation. Regional isostasy, in combination with
inherited relief, enhances the uneven accumulation of sediments in the foreland basin, enhancing the aforementioned effects.
High erosion rates do not always lead to fewer thrusts within the compressional belts but generally steepen and lengthen the
lifetime of the affected faults.
UR: http://www.geo.vu.nl/\~\ gard
DE: 1625 Geomorphology and weathering (1824, 1886)
DE: 1815 Erosion and sedimentation
DE: 8102 Continental contractional orogenic belts
SC: Tectonophysics [T]
MN: 2003 Fall Meeting