Amagmatic “intrusions” of originally sedimentary carbonate rocks into massifs, concentric type, as in Aldanian shield

Paleorift structure in the eastern environs of the Siberian Platform

“…An analysis of all the absolute-age determinations of the rocks of the various phases of emplacement of these massifs, with all the evidence, suggests a most acceptable figure of 300-420 m. y. This, in combination with geological observations and information on the tectonomagmatic activity in the Sette-Daban during Devonian time, favors Late Devonian age for the bodies (7,11).…”

“…The Gek, Voin, and Povorotnyy massifs lie in the fault zone, and the Gornoozero massif is located 8 km west, but merges with this zone at a depth of 8-10 km (7). Thus, the Burkhala deep-seated fault is a large regional geological structure, characterized by complex construction and lengthy development.…”