Heat transfer between a thermochemical plume channel and the surrounding mantle in the presence of horizontal mantle flow |
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| Authors: | A A Kirdyashkin N L Dobretsov A G Kirdyashkin |
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| Institution: | (1) Institute of Geology, Geophysics, and Mineralogy, Siberian Branch, Russian Academy of Sciences (RAS), pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia |
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| Abstract: | Heat and mass transfer processes in the conduit of a thermochemical plume located beneath an oceanic plate far from a mid-ocean ridge (MOR) proceed under conditions of horizontal convective flows penetrating the plume conduit. In the region of a mantle flow approaching the plume conduit (in the frontal part of the conduit), the mantle material heats and melts. The melt moves through the plume conduit at the average velocity of flow v and is crystallized on the opposite side of the conduit (in the frontal part of the conduit). The heat and the chemical dope transferred by the conduit to the mantle flow are carried away by crystallized mantle material at the velocity v.The local coefficients of heat transfer at the boundary of the plume conduit are theoretically determined and the balance of heat fluxes through the side of the plume conduit per linear meter of the conduit height. The total heat generation rate, transmitted by the Hawaiian plume into the upper and lower mantle, is evaluated. With the use of regular patterns of heat transfer in the lower mantle, which is modeled on the horizontal layer, heated from below and cooled from above, the diameter of the plume source, the kinematic viscosity of the melt in the plume conduit, and the velocity of horizontal lower-mantle flows are evaluated and the dependences of the temperature drop, viscosity and Rayleigh number for the lower mantle on the diameter of the plume source are presented. |
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| Keywords: | thermochemical plume horizontal mantle flows heat transfer heat generation rate source diameter flow velocity melt fraction |
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