3 research outputs found
Basin evolution in a folding lithosphere: Altai-Sayan and Tien Shan belts in Central Asia
Central Asia is a classical example for continental lithospheric folding. In particular, the Altay–Sayan belt in
South-Siberia and the Kyrgyz Tien Shan display a special mode of lithospheric deformation, involving
decoupled lithospheric mantle folding and upper crustal folding and faulting. Both areas have a heterogenous
crust with a long history of accretion–collision, subsequently reactivated as a far-field effect of the Indian–
Eurasian collision. Thanks to the youthfulness of the tectonic deformation in this region (peak deformation
in late Pliocene–early Pleistocene), the surface expression of lithospheric deformation is well documented
by the surface topography and superficial tectonic structures. A review of the paleostress data and tectonostratigraphic
evolution of the Kurai-Chuya basin in Siberian Altai, Zaisan basin in Kazakh South Altai and
Issyk-Kul basin in Kyrgyz Tien Shan suggests that they were initiated in an extensional context and inverted
by a combination of fault-controlled deformation and flexural folding. In these basins, fault-controlled deformation
alone appears largely insufficient to explain their architecture. Lithospheric buckling inducing surface
tilting, uplift and subsidence also played an important role. They form typical basins in a folding lithosphere
(FLB). Their characteristic basin fill and symmetry, inner structure, folding wavelength and amplitude, thermal
regime, time frame are examined in relation to basement structure, stress field, strain rate, timing of deformation,
and compared to existing modelling results
Basin evolution in a folding lithosphere: Altai-Sayan and Tien Shan belts in Central Asia
Central Asia is a classical example for continental lithospheric folding. In particular, the Altay–Sayan belt in
South-Siberia and the Kyrgyz Tien Shan display a special mode of lithospheric deformation, involving
decoupled lithospheric mantle folding and upper crustal folding and faulting. Both areas have a heterogenous
crust with a long history of accretion–collision, subsequently reactivated as a far-field effect of the Indian–
Eurasian collision. Thanks to the youthfulness of the tectonic deformation in this region (peak deformation
in late Pliocene–early Pleistocene), the surface expression of lithospheric deformation is well documented
by the surface topography and superficial tectonic structures. A review of the paleostress data and tectonostratigraphic
evolution of the Kurai-Chuya basin in Siberian Altai, Zaisan basin in Kazakh South Altai and
Issyk-Kul basin in Kyrgyz Tien Shan suggests that they were initiated in an extensional context and inverted
by a combination of fault-controlled deformation and flexural folding. In these basins, fault-controlled deformation
alone appears largely insufficient to explain their architecture. Lithospheric buckling inducing surface
tilting, uplift and subsidence also played an important role. They form typical basins in a folding lithosphere
(FLB). Their characteristic basin fill and symmetry, inner structure, folding wavelength and amplitude, thermal
regime, time frame are examined in relation to basement structure, stress field, strain rate, timing of deformation,
and compared to existing modelling results