CRYSTALLINE BASEMENT IN THE SOUTHWEST OF THE SIBERIAN PLATFORM

B. V. Shibistov 1, V. A. Krinin 2, D. S. Metrikin 1, Z. V. Mikhaylova 1

1 Gravimetric Expedition No. 3, Krasnoyarsk; 2 Siberian Federal University, Krasnoyarsk, Russia

Based on the studies of granitoids uncovered in several wells under the Vendian base or in the Riphean deposits, a number of scientists concluded that a large crystalline basement block lies 2-3 km deep in the southwest of the Siberian Platform. In the Carelian and Riphean sections of the Yenisei ridge, magmatic rocks are associated with the tectonic activation stages and lie in several stratigraphic levels. The basement of the southwestern Siberian Platform may be the fragments of magmatites in various cross-section levels, tapped by several wells. Under the basement, there may be terrigenous-carbonaceous Riphean strata of the platform cover that favour accumulation of hydrocarbons. The basement age is still unclear due to a small number of findings and a wide range of ages tested by various methods and different laboratories.

Key words: Siberian Platform, crystalline basement, Yenisei ridge, magmatism, Riphean.

DOI 10.20403/2078-0575-2017-1-3-11

Download PDF