FORMATION OF MARGINAL SEAS OF THE PACIFIC OCEAN: A CONSEQUENCE OF SHEAR INSTABILITY AND ASTHENOSPHERIC DIAPIRISM
| Autor: | A. M. Petrishchevsky, Yu.I. Melnichenko, N. S. Lee, M. A. Vasilyeva, T. A. Emel’yanova, V.I. Chuprynin, L. A. Izosov |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Вестник Камчатской региональной ассоциации "Учебно-научный центр". Серия: Науки о Земле, Vol 46, Iss 2, Pp 85-101 (2020) |
| ISSN: | 1816-5532 1816-5524 |
| DOI: | 10.31431/1816-5524-2020-2-46-85-101 |
| Popis: | On the basis of the mechanism of instability of the shear zone between moving lithospheric plates, a new version of the model for the formation of marginal seas of the Pacific Ocean in the form of successive occurrence of wave stresses and vortex structures has been proposed. The lithospheric plates in their lateral interaction zone possess to a great extent the properties of a viscous medium, where two tectonic masses with high but different viscosity and different densities weakly intermixing horizontally are moving at different velocities. Therefore, the interface begins to bend, resulting in vortex structures in the tectonosphere of marginal seas and adjacent continental areas. At sharp and rapid deformations, the Earth’s crust behaves like a solid body, and at long time deformations — like a viscous medium. This mechanism of formation of the seas reflects the initial stage of the collision of the Pacific plate with Eurasia, when the converging plates are just beginning to contact. Duplex zones are formed in the Earth’s crust and the upper mantle of marginal seas, where the crust-mantle substance is undergoing vortex circulation. |
| Databáze: | OpenAIRE |
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