Physics
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.8937w&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. B6, June 10, 1992, p. 8937-8950.
Physics
9
Degassing, Earth Mantle, Free Convection, Geochronology, Mathematical Models, Temperature, Heat Flux, Moisture Content, Structural Properties (Geology), Viscosity
Scientific paper
An internally heated model of parameterized whole mantle convection with viscosity dependent on temperature and volatile content is examined. The model is run for 4l6 Gyr, and temperature, heat flow, degassing and regassing rates, stress, and viscosity are calculated. A nominal case is established which shows good agreement with accepted mantle values. The effects of changing various parameters are also tested. All cases show rapid cooling early in the planet's history and strong self-regulation of viscosity due to the temperature and volatile-content dependence. The effects of weakly stress-dependent viscosity are examined within the bounds of this model and are found to be small. Mantle water is typically outgassed rapidly to reach an equilibrium concentration on a time scale of less than 200 Myr for almost all models, the main exception being for models which start out with temperatures well below the melting temperature.
Pan Vivian
Williams David Richard
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