Physics – Fluid Dynamics
Scientific paper
Jul 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986e%26psl..78..435g&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 78, no. 4, July 1986, p. 435-446.
Physics
Fluid Dynamics
39
Anomalous Temperature Zones, Buoyancy, Earth Mantle, Free Convection, Geophysical Fluids, Geotemperature, Volcanology, Boundary Layer Stability, Geochemistry, Heating, Islands, Ocean Bottom, Radiogenic Materials, Rayleigh Number
Scientific paper
Based on the fluid dynamics of the smallest scales of motion in thermal convection at high Reynolds number, the flow structure of instable thermals which are likely to form in the mantle on a bottom boundary layer is predicted. A similarity solution suggests that thermals may be initiated with scales close to 200 km, and can produce temperature anomalies of order 200 C over an area 500-1000 km in diameter. Single thermals originating deep in the mantle have length and time scales consistent with observations of island chains. An extension of the analy sis to thermals in which all the buoyancy is generated by anomalous internal heating associated with chemical heterogeneities suggests that thermals will develop an approximately spherical shape and will pass through a maximum temperature as a result of assimilation of previously cold mantle material, though internal heating is found to be of little significance in the mantle.
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