Geothermodynamic model of the supposed paleozone of lithospheric subduction in the Black Sea Basin and its relation to the metal genesis zonation of the Crimea and the Caucasus

Гаврилов, С. В.; Kharitonov, A. L.

doi:10.52349/08697892_2021_87_04-16

Regional Geology and Metallogeny

2021

DOI: 10.52349/08697892_2021_87_04-16

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Geothermodynamic model of the supposed paleozone of lithospheric subduction in the Black Sea Basin and its relation to the metal genesis zonation of the Crimea and the Caucasus

С. В. Гаврилов

A. L. Kharitonov

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Investigation of dependence of the heat flux anomalies in the rear of subduction zones on the angle and velocity of subduction

Гаврилов

Kharitonov

2023

Vestnik of Geosciences

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The relevance of the material presented in this article is related to the identification of the dependence of the anomalous heat flux magnitude on the angle and velocity of lithospheric subduction, and assuming the constancy of the effective viscosity of the upper mantle material and the conductive mechanism of dissipative heat transfer. We analytically solved the equation of dissipative heat transport in a mantle wedge over a flatly subducting lithospheric plate on the basis of the method estimating the anomalous heat flux carried to the day surface from the mantle wedge in the rear of subduction zones. As a result, exemplified by Amur and Adriatic plates, for which the velocity of subduction is determined by modern geodetic methods (approximately 10 mm per year) and the angle of subduction — from seismological data (25–30 degrees), the obtained dependence of the anomalous heat flux on the angle and velocity of lithospheric subduction is proved valid. The previously unmeasured velocity of the Black Sea microplate subduction under the Crimea was estimated of 3 mm per year. With the obtained velocity of matter in the mantle wedge at the roof of the mantle, the upward conductive flow can provide the observed removal of heat and hydrocarbons from the mantle to the day surface and the formation of hydrocarbon deposits.

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Investigation of dependence of the heat flux anomalies in the rear of subduction zones on the angle and velocity of subduction

Гаврилов

Kharitonov

2023

Vestnik of Geosciences

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Relative role of dynamic pressure forces and viscous stresses in tectonically active transition zones of the Earth

Gavrilov,

Kharitonov

2024

Vestnik of Geosciences

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This article shows the role of dynamic non–hydrostatic pressure forces and viscous stresses in asthenosphere of tectonically active transition zones from the continent to the ocean. We have studied zones of active tectonic processes in the lithosphere and the underlying mantle, affecting the lithospheric blocks, the day surface of the Earth and the boundaries of density inhomogeneities. We showed the predominant influence of viscous stresses on the formation of mantle diapers and often associated hydrocarbon deposits. In subduction zones, in which a large-scale descending convective flow descends into the upper mantle as a sinking hard lithospheric block. We studied forces that determine the angle of subduction, depending on the age of the lithosphere, the rate of subduction and the rheological properties of the mantle material. We applied the method of analytical thermodynamic modeling of the tectonic structure of the upper mantle (lithosphere, asthenosphere) in the transition zone from the continent to the ocean. We concluded that the relative role of dynamic pressure forces prevailed in zones characterized by horizontally elongated asthenospheric movements in the mantle, as it happened under extended oceanic lithospheric plates. The novelty of the research is connected with the conclusion that under lithospheric micro-plates and near their boundaries, the roles of dynamic pressure forces and viscous stresses are comparable. In the areas of thermal diapirs associated with subduction zones and often located in transition zones from the continent to the ocean, the role of viscous stresses prevails. Thermal diapirs in subduction zones sometimes lead to the formation of hydrocarbon deposits due to mantle degassing processes.

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Geothermodynamic model of the supposed paleozone of lithospheric subduction in the Black Sea Basin and its relation to the metal genesis zonation of the Crimea and the Caucasus

Cited by 2 publications

References 0 publications

Investigation of dependence of the heat flux anomalies in the rear of subduction zones on the angle and velocity of subduction

Investigation of dependence of the heat flux anomalies in the rear of subduction zones on the angle and velocity of subduction

Relative role of dynamic pressure forces and viscous stresses in tectonically active transition zones of the Earth

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