The study concerns two deep sources of tectonic processes in Late Mesozoic and Cenozoic which influence is transferred and enforced on the spheroid surface – Earth crust. The first source is mantle convection. Its upgoing branches are comprised by mantle superplumes from which the upper mantle flows spreads laterally. Downgoing convection branches are comprised by detached highly metamorphosed fragments of thickened continental lithosphere and partially by subducted slabs, submerged lower than transitional mantle layer (~410–680 km). Major of subduction zones are transformed to subhorizontal lenses at the transitional layer depth participating in upper mantle convection. Coupled with total mantle convection it defines plate tectonic processes and lithosphere density loose, bringing rise amplifying during mountain formation. The second source is outer core flows reflected in magnetic field inversions, which are more frequent during or before of major of tectonic activity phases (phases of compression and transpression deformations strengthen). Inversion frequency rises during neotectonic orogeny. It is supposed, that Earth core flows change its spheroid parameters, which brings to the appearance of volume forces, affecting almost immediately in geological time. Thus core flows contribute to global character of tectonic phases occurrences and synchronicity for superposition of modern mountain formation main phase with plate tectonic processes.
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The work was financed by the Russian Science Foundation (project no. 17–17–01073).
Translated by N. Astafiev
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Trifonov, V.G., Sokolov, S.Y. Tectonic Phenomena and Supervising Underlying Geodynamic Processes. Geotecton. 52, 564–577 (2018). https://doi.org/10.1134/S0016852118050072
- mantle and upper mantle convection
- orogenic phases and magnetic inversions correlation
- global synchronicity of mountain formation periods