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Internally heated mantle convection and the thermal and degassing history of the earthAn 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.
Document ID
19920060793
Document Type
Reprint (Version printed in journal)
Authors
Williams, David R. (NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Pan, Vivian (Arizona State University Tempe, United States)
Date Acquired
August 15, 2013
Publication Date
June 10, 1992
Publication Information
Publication: Journal of Geophysical Research
Volume: 97
Issue: B6 J
ISSN: 0148-0227
Subject Category
GEOPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAG9-237
CONTRACT_GRANT: NAG2-690
Distribution Limits
Public
Copyright
Other