Abstract
In the Late Proterozoic and Middle Paleozoic, the Siberian platform and Verkhoyano-Chukotsk area were periodically involved in continental rifting processes. The Udja, Yudoma-Maya, and other paleorifts are Riphean-Vendian in age. The Vilyuis-West Verkhoyansk, and Arga-Tass rift systems were formed during the Middle Paleozoic. Rift structures appear as narrow, elongated, branched trough-like depressions. In the axial parts of the structures, normal and subalkali mafic lava flows, dyke belts, and intrusive sheets are common. Mafic rocks of paleorifts are similar to those of classic rifts. There is a direct correlation between the intensity of paleorifting processes and the developmental regime during the postrift epochs. Small rift zones (graben depth of 2–4 km) later (in the Cambrian-Ordovician and Upper Paleozoic-Mesozoic, respectively) gave way to syneclises. Large rifts (graben depth over 10 km) were transformed into suboceanic (miogeosynclinal) basins.
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