Unknown
In:
Geology, Stockholm, Wissenschaftliche Buchgesellschaft, vol. 26, no. 6, pp.
511-514, pp. L15318, (ISSN: 1340-4202)
Publication Date:
1998
Description:
The thick (up to 65 km) crust of the high-elevation regions of the Andean
orogenic belt results from structural thickening of the felsic upper crust of South
America. The great thickness implies shortening or loss of several hundred kilometers of
lithospheric mantle and lower crust. Through numerical simulation of the thermal and
mechanical processes of crustal thickening, we test a model of lithospheric-mantle
removal by ablative subduction. The model combines kinematic assumptions regarding
mantle motion with dynamic calculations of crustal deformation. Predictions include the
formation of an outwardly growing orogenic plateau - analogous to the Altiplano - that
results from high-temperature, low-viscosity flow of the lower crust due to thickening
of the high-heat-production upper crust.
Keywords:
Plate tectonics
;
Earth model, also for more shallow analyses !
;
Geothermics
;
Subduction zone
;
Geol. aspects
;
Rheology
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