Modern structure, evolution, and petroleum potential of the zone of junction of the Siberian Platform and West Siberian Plate

Based on the available geological and geophysical data, we propose a model for the Formation of the modern structure of the zone of junction of the Si berian Platform and West Siberian Plate. This area evolved in five stages. At the first. Early-Middle Riphean, stage, a volcanosedimentary complex for med on the continental crust of the Siberian Platform and on the Kas microc ontinent, separated from the North Asian craton in the early Riphean, betwe en which there was a basin with oceanic crust. The second stage (about 850 Ma BP) involved collision of the Kas microcontinent, which resulted In obdu ction of the oceanic formations on the edge of the Siberian Platform, their crumpling and metamorphism. At the third stage (from Baikalian to Late Car boniferous), a terrigenous-carbonate-evaporite plate complex formed through out the study territory. The fourth stage (Late Carboniferous-Early Triassi c) was related to the closure of the Paleoasian ocean and collision process es on the western margin of the Kas massif. At the final (Meso-Cenozoic) st age, a plate complex formed on the left bank of the Yenisei River, and upli fting of the Yenisei Range and adjacent areas of the Siberian Platform occu rred.