THE ORIGIN OF THE SIBERIAN PLATFORM |
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| Abstract: | The paper explores the two divergent schools of thought on the origin of the Siberian platform: 1) the Delanée concept visualizing the formation as the result of terminal Precambrian (Baykal'ian) deformation that knit various independent Archean units into a single body which grew by accretion of peripheral folded belts, and 2) a new concept developed by Scheinmann and Spizharskiy who believe the platform is a remnant of an Archean-early Proterozoic folded system broken up by great rifts which became sites of geosynclines later transformed into Baykafian fold systems. The author embraces the latter concept. The basement of the Siberian Platform and Yenisey folded belt is not older than 1.76 billion years; and its sedimentary cover is not younger than 1.55 million years old; and the platform as a whole therefore must have come into being between 1.6 and 1.7 billion years ago.--B. N. Cooper. |
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