Mathematical modeling of the Teletskoe Lake faults for estimation of paleostresses under the Earth's crust extension

A model of formation of tectonic extension structures with faults has been developed and tested on the Teletskoe Lake (Gorny Altai) rift. The dynamic model of formation of the U-shaped structure of the Earth's crust extension was based on the rheology of a nonlinearly hardened plastoelastic body. Th e designed software is universal and is intended to solve plane plastoelast ic problems. The author considers the problems of plane stressed state and plane deformation. The calculations show that a 4-5 km wide rift can form w hen the medium undergoes a tensile stress no less than 1.5 kbar. The dynami cs of development of a plastic-flow zone and the position of the boundary o f the elastic-deformation-plastic-deformation transition are studied. The p aper also discusses possible mechanisms of formation of zones of radial-fau lts joint which border the margins of the main rift basin.