DYNAMICS OF PLATE INTERIORS
Geodynamics Series, Vol. 1
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DYNAMICS OF PLATE INTERIORS, GEODYNAMICS SERIES, VOL. 1, PAGES 53–71, 1980


Dynamics of the Russian and West Siberian platforms

A. L. Aleinikov, O. V. Bellavin, Yu. P. Bulashevich, and I. F. Tavrin

Uralian Scientific Centre, Swerdlovsk, USSR

E. M. Maksimov and M. Ya. Rudkevich

West Siberian Petroleum Institute, Tjumen, USSR

V. D. Nalivkin and N. V. Shablinskaya

VNIGRI (Union Petrol. Scientific Geological Research Institute), Leningrad, USSR

V. S. Surkov

SNIIGGIMS (Siberian Scientific Geological and Geolophysical and Mineral, Resource Institute), Nowosibirsk, USSR


Abstract

On the Russian, West Siberian and some other platforms, sedimentation began with the formation of major grabens (aulacogens). Structures of this type are apparently most common during the initial stages of platform development. The aulacogen and geosynclinal downwarping is associated with epochs of major transgressions while tectonic inversion of aulacogens and orogeny are associated with regressions. Different size platform structures of ancient and young platforms suggest an increase in growth rate during the beginning of transgressions and decrease in growth rate during regressions. All this implies the existence of uniform periodical tectonic processes that may be operative over vast areas of the globe. Average growth rates of platform structures are very low, i.e., 0.15–5 m per Ma. On the ancient Russian platform, such rates were smaller than those on the young West Siberian platform. The duration of structural growth can be rather long. On the young West Siberian as well as on the more ancient Russian platform, structures continue to grow and today many of them are reflected in the topography. This suggests that deep-seated loci of tectonic movements are persistent both in time and with respect to platforms. Major fractures have an eveja longer duration, often extending over 25 percent of the earth's age. Fractures on the platforms discussed in this paper are most widespread near the top of the basement. They decrease in number in the upper parts of the sedimentary cover and apparently in the lower crust. Deep seismic soundings clearly show that the loci of tectonic movements responsible for the formation of the major and biggest structures on both ancient and young platforms lie below the earth1s crust. Their evolution should be concurrent with those of lithosphere plates. The presence of steep fractures is another argument against permanent and considerable horizontal displacements in the earth's crust.

Citation: Aleinikov, A. L., O. V. Bellavin, Yu. P. Bulashevich, I. F. Tavrin, E. M. Maksimov, M. Ya. Rudkevich, V. D. Nalivkin, and V. S. Surkov, (1980), Dynamics of the Russian and West Siberian platforms, in Dynamics of Plate Interiors, Geodyn. Ser., vol. 1, edited by A. W. Bally et al., pp. 53-71, AGU, Washington, D. C.