Abstract The maximum inventories of CO2 and H2O in the terrestrial and Venus mantles are calculated on the basis of shock wave data for magnesite and dunite to be ∼103 times the observed atmospheric inventories. The CO2 fugacity determiend for the buffered reaction MgCO3 plus SiO2 going to MgSiO3 plus CO2 yields values which increase from 10−4 to 100 times the lithostatic pressure, going from 35 to 800 km depths in the earth. The major uncertainties in the fugacity calculations arise from lack of knowledge of effective activities. The calculated fugacity of CO2 and water brought to the surface from hypothetical mantle reservoirs on Earth and Venus indicate that, in the case of the Earth, the cool and dry atmosphere is strongly depleted in both CO2 and H2O compared to the low velocity zone. In contrast to the Earth, on Venus, the 750 K surface temperature and 90 bar CO2 surface pressure is in equilibrium and probably in communication with an assumed upper mantle CO2 reservoir.


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    Title :

    Carbon dioxide within Venus and the Earth


    Contributors:

    Published in:

    Publication date :

    1981-01-01


    Size :

    11 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



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