Abstract: The article reports morphotectonic and petrological characteristics of Permo-Triassic trap basalts covering the major part of Siberian Craton and its surroundings. Lavas, sills, and dykes are distributed in Taimyr, in the crystalline basement and Mesozoic cover of the West Siberian Plate and in Kara sedimentary basin. Investigations include relief analysis, seismotomographic data, magnetic and gravitational anomalies. Four sectors of magma-permeable zones were distinguished along the perimeter of the Anabar Shield in the Siberian craton. The western sector is characterized by an intensive fracturing and stretching where the Tunguska syncline filled by the flood basalt was formed. A striking feature of volcanism is the meridional petrochemical trend corresponding to increasing the silica (decreasing pressure) of basic magmas in volcanic and intrusive rocks of the Siberian Craton from the impact center, located at the North near Norilsk, to South regions Kuzbass and Angara-Taseev regions. It corresponds to the thinning of the mantle keel, which coincides with the reduction of the volumes of erupted melts. This trend was determined for volcanics referring to the two major time events 252244 and 238232 Ma. Research highlights: Permo-Triassic traps of Siberia cover West Siberian Plate and Siberian Crat.Plum impact is located part near the Norilsk region.Diffused spreading developed in Tunguska syncline.Intensive volcanism concentrating along the deep faults.In the Northern part the dike belts and extended sill intrusions prevail.Tuffitic magmatism with higher silica dominated in the southern areas with the thinner lithospheric mantle.