Сериальное издание: Izvestiya, Physics of the Solid Earth
Страницы: 864-877
Аннотация
From seismic data in the crust is revealed the structures of the Priverkhoyansk foredeep and local Backgraben (together with the adjacent part of the fold region) separated by the high-velocity massif of the Sette-Daban tectonic zone. The craton boundary slopes at an angle of about 15 degrees beneath the folded crust, where is absent the lower crust layer with a velocity of 6.7-6.9 km/s, which is characteristic of the craton. The velocity in the entire crust of the studied part of the fold system is decreased to 6.2-6.3 km/s, versus 6.4-6.5 km/s for the craton, just like on Moho, from 7.9-8.0 to 8.3-8.4 km/s, respectively. The model is consistent with the views about the passive continental margin of the Siberian craton subjected to Mesozoic folding.
