Tectonics and Magmatism of the Taimyr Peninsula (Arctic): the correlation of collision and plume events

The tectonic and magmatic events in the Arctic in the Precambrian-Paleozoic-Mesozoic history well demonstrate the disintegration of ancient continents, for example, the Arctida paleocontinent, and the formation of new ones, including during the formation of supercontinents, for example, at the Permian - Triassic boundary. Detailed (U-Pb and Ar-Ar) dating of igneous rocks of the Taimyr fold belt shows that its vast granite magmatism, caused by the collision of the Kara microcontinent with the Siberian craton at the Permian - Triassic boundary, smoothly transitions into the flood basalts magmatism, associated with the Siberian plume and the formation of the large igneous province. The collision event led to the thickening of the continental crust, melting and formation of large volumes of syncollisional granites in the period of 315-304 Ma. Then the collision slowed down, stopped and the orogen collapsed, which led to postcollisional granitoid magmatism in the range of 264-252 Ma. The final period of development of the Taimyr folded area starts at 252-249 Ma and coincides in time with the manifestation of the Siberian plume, namely the outpouring of the trap basalts and the formation of intrusions from undifferentiated dolerites to layered intrusives with compositions ranging from peridotites to gabbroids and diorites, syenites and granites aged 251-249 Ma. This work was supported by the Russian Science Foundation (Projects No. 14-37-00030, 19-17-00091).