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Mantle devolatilization and rheology in the framework of planetary evolutionWe investigate the thermal history of an Earth-like planet with the help of a parameterized mantle convection model including the volatile exchange between mantle and surface reservoirs. The weakening of mantle silicates by dissolved volatiles is described by a functional relationship between creep rate and water fugacity. We use flow law parameters of diffusion creep in olivine under dry and wet conditions. The mantle degassing rate is considered as directly proportional to the seafloor spreading rate, which is also dependent on the mantle heat flow. To calculate the spreading rate, we assume that the heat flow under the mid-ocean ridges is double the average mantle heat flow. The rate of regassing also depends on the seafloor spreading rate as well as on other factors like the efficiency of volatile recycling through island arc volcanism. Both mechanisms (de- and regassing) are coupled self-consistently with the help of the parameterized convection model under implementation of a temperature and volatile-content-dependent mantle viscosity.
Document ID
19950015371
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Franck, S.
(Potsdam Univ. Potsdam, Germany)
Bounama, CH.
(Potsdam Univ. Potsdam, Germany)
Date Acquired
September 6, 2013
Publication Date
January 1, 1994
Publication Information
Publication: Lunar and Planetary Inst., Conference on Deep Earth and Planetary Volatiles
Subject Category
Lunar And Planetary Exploration
Accession Number
95N21788
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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