CENOZOIC HISTORY OF TOPOGRAPHY IN SOUTHEASTERN GORNY ALTAI: THERMOCHRONOLOGY AND RESISTIVITY AND GRAVITY RECORDS
N.L. Dobretsov1,2, M.M. Buslov3,2, A.N. Vasilevsky1,2, E.V. Vetrov3,4, N.N. Nevedrova1,2
1A.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia
2Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia
3V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia
4Siberian Research Institute of Geology, Geophysics, and Mineral Deposits, Krasnyi pr. 67, Novosibirsk, 630091, Russia
Keywords: Neotectonics, plateau, strike-slip fault, thrust, ramp, fission-track thermochronology, resistivity and gravity fields, Gorny Altai
Abstract
The Central Asian Orogen was reactivated in the Cenozoic, which gave rise to mountain systems and sedimentary basins, strike-slip and thrust faults, ramps, and rift basins under the far-field effect of the India-Eurasia collision. Pre-Cenozoic structures, as well as the superposed Cenozoic deformation, are traceable in the gravity pattern. Analysis and correlation of stratigraphic, tectonic, geomorphological, and geophysical (resistivity and gravity) data from Gorny Altai and tectonic modeling on the basis of apatite fission-track thermochronology show that vertical motions have been the most active for the past 5 Ma. The uplift and subsidence produced, respectively, the Chulyshman and Ukok plateaus with high mountains around and the the Kurai-Chuya basin between them. Gravity data suggest the existence of Late Carboniferous, Jurassic, and Cretaceous rocks found in tectonic wedges around the basin at the base of its sedimentary fill.
|
