Uplifts formation features in continental collision structures (evolution modeling)статьяИсследовательская статьяЭлектронная публикация
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Аннотация:The investigation of collision structures is conducted based on the complex model of the
thermal and mechanical evolution of overthrusting process for the rheologically layered
lithosphere, which includes brittle upper crust and the lower crust and lithospheric upper
mantle with dierent eective viscosity values. Finite element models with Lagrangian
approach were used for the problem simulation. Horizontal shortening leads to the upper
crust overthrusting along the fault zone, additional loading to the lower layers which is
redistributed in the process of erosion of the uplift. These processes are compensated by
ductile
ow at the level of the lower crust and the upper mantle. The results of modeling of
collision belts evolution during and after the convergence process have been compared for
main governing parameters: shortening velocity (strain rate), viscosity contrast, erosion rate
and dip angle of thrusting. The calculations with dierent erosion rates (0.25{5 mm/yr)
show that this process has a weak eect on the postcollisional uplift evolution, which is
governed mainly by the viscosity values of the lower crust and lithosphere upper mantle and
initial geometry of the structure. But denudation results in surface exposure of metamorphic
sequences, typical for thrust faults. KEYWORDS: Lithosphere; the Earth’s crust; rheology;
collision; overthusting; erosion.