- Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russian Federation (a.tarasov2@g.nsu.ru)
The process of magmatic melt intrusion into permeable zones of the lithosphere, as well as deformation of the permeable region of magmatic channels, is studied within the framework of two-speed thermohydrodynamics of viscous compressible media. The model has applications in the problem of evolution of magmatic systems in the lithospheric mantle and crust of cratons and the ocean-continent transition region. The mathematical model of two-speed hydrodynamics of high-temperature melts is thermodynamically consistent and takes into account such dissipative processes as phase viscosity, thermal conductivity, interphase friction, and surface effects in a heterophase medium. Taking into account the compressibility of the medium allows us to study heat and mass transfer in flows of heterophase melts with a high content of magmatic fluids. Numerical modeling of magmatic melt intrusion into vertical channels was performed for problems characterized by the following parameters: temperature of the two-phase medium 500-1200°C, melt viscosity 101-106 P, velocities of the carrier phase and inclusions were 10-3-10-1 cm/s. The injected high-temperature heterophase magmatic flow was specified as non-uniform in terms of the content of the dispersed phase. This leads to the formation of two- and three-layer flows in the gravity field.
The process of introduction of a high-temperature heterophase medium into a permeable zone located at a lower temperature is shown in Figure 1. The introduced flow is characterized by a lower content of inclusions compared to their content in the channel. The development of instability of the intruded flow is caused by the initial heterogeneity at the boundary.
Figure 1. Dynamics of the introduction of a high-temperature heterophase substance into a vertical channel in a gravity field: the distribution of temperature (left) and volume content of dispersed phase particles (right) is shown for different moments in time.
The difference in the nature of the developed flow for melts with different viscosities is shown in Figure 2.
Figure 2. Distribution of temperature (left) and volume content of dispersed phase particles (right) during the introduction of a heterophase substance with different viscosities of the carrier phase (10-1, 100, 101, 102 P)
The work was carried out with the financial support of the Russian Science Foundation, grant No. 24-27-00411.
How to cite: Imomnazarov, S., Perepechko, Y., and Sorokin, K.: Dynamics of two-phase flows in magmatic channels, EGU General Assembly 2025, Vienna, Austria, 27 Apr–2 May 2025, EGU25-17151, https://doi.org/10.5194/egusphere-egu25-17151, 2025.
