Authors Kirdyashkin A.. ,
Kirdyashkin A.. ,
Bibliographic description
Category Earth science
DOI 551.2+551.14+536.25
DOI 10.21209/2227-9245-2022-28-10-15-23
Article type
Annotation The flow for the uplift slope is considered in the viscous liquid model. The relevance of the study is justified by the need for experimental and theoretical analysis of the geodynamic processes occurring in the slopes of rises. The object of the study is the slopes of rises, formed by mantle thermochemical plumes which have not come to the surface. The objectives of the study are to present the velocity profile of the viscous flow of the uplift slope and to determine the friction coefficient for it; to find out the effect of the dynamic viscosity coefficient of the slope on the appearance of compressive and tensile stresses; on the basis of laboratory and theoretical simulations to find out the hydrodynamics of the flow when the liquid flows from a rectangular vessel and using the results of geodynamic simulations to determine the flow parameters in the area of the uplift slope fault formation. The flow occurring in a viscous liquid at a constant inclination angle of the free surface of the elevation slope is considered. In a highly viscous liquid at low flow velocities, the inertial terms in the equation of motion can be neglected. For this case, the solution of the equation of motion in a layer with an inclined free surface at a constant horizontal pressure gradient is obtained. The flow velocity profile in such a layer and the relation for the maximum flow velocity are obtained. The tangential stress on the sole of the layer is determined. The tangential stress does not depend on the viscosity, but depends on the layer thickness. With a constant viscosity of the layer, the elevation slope is under conditions of compressive stresses. Strain conditions for the uplift slope are possible when the viscosity of the layer decreases with distance from the main ridge. Discontinuities occur on the elevation slopes due to changes in viscosity along the slope and changes in the velocity. Under the influence of gravitational forces caused by the density difference at the rupture boundary, flow occurs and the resulting free volume is filled. The motion in a highly viscous liquid during the formation of a free vertical surface has been studied experimentally when liquid flows out of a transparent rectangular vessel. Photographs of the free surface were obtained. A linear dependence of the relative height of the free surface location on the relative horizontal coordinate is observed. Expressions are obtained for the average velocity and expiration time of a viscous liquid from a rectangular vessel. Estimates of the average velocity and outflow time for the specified slope parameters are presented
Key words Key words: uplift slope, horizontal pressure gradient, dynamic viscosity, creeping flow, rupture, outflow velocity, geodynamic processes, high-viscosity medium, free surface, sole layer
Article information Kirdyashkin A., Kirdyashkin A. Geodynamic processes in the uplift slope // Transbaikal state university journal, 2022, vol. 28, no. 10. рр.15-23. DOI: 10.21209/2227-9245-2022-28-10-15-23
References 1. Belousov V. V. Osnovy geotektoniki (Basics of Geotectonics). Moscow: Nedra, 1989. 382 p. 2. Maruashvili L. I. Priroda (Priroda), 1937, no. 4, pp. 34–44. 3. Milanovsky E. E. Noveyshaya tektonika Kavkaza (Latest tectonics of the Caucasus). Moscow: Nedra, 1968. 483 p. 4. Safronov I. N. Geomorfologiya Severnogo Kavkaza (Geomorphology of the Northern Caucasus). Rostov-on-Don: Rostov University Publishing House, 1969. 218 p. 5. Schlichting H. Teoriya pogranichnogo sloya (Boundary-layer theory). Moscow: Nauka, 1974. 712 p. 6. Camp V. E., Ross M. E. Journal of Geophysical Research. 2004. Vol. 109, no. B08204. Pp. 1–14, doi: 10.1029/2003JB002838. 7. Condie K. C. Mantle plumes and their record in Earth history (Mantle plumes and their record in Earth history). New York: Cambridge University Press, 2001. 306 p. 8. Ernst R. E. Large igneous provinces (Large igneous provinces) Cambridge: Cambridge University Press, 2014. 653 p. 9. Ernst R. E., Buchan K. L. Annual Review of Earth and Planetary Sciences. 2003. Vol. 31. Pp. 469–523. 10. Sengör А. M. C. Special Paper of the Geological Society of America. 2001. Vol. 352. Pp. 183–225.