Computer Science
Scientific paper
Oct 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.4619s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 57, p. 4619
Computer Science
14
Mars Atmosphere, Geochemistry, Outgassing, Regolith, Carbon Dioxide, Earth-Moon System, Mars Environment, Planetary Composition
Scientific paper
A geochemical cycle model is presented for the interaction between the atmosphere, hydrosphere, and regolith of Mars in order to study how this interaction might have produced the present Martian environment from a primitive Martian environment much like that of the primitive Earth. The model is a simple system, consisting of an unweathered starting material (calcium-bearing and magnesium-bearing silicates), a CO2 atmosphere, an ocean of water in contact with both the atmosphere and the unweathered starting material, and both calcite and dolomite precipitates. A result arising from this model is that a 1-bar CO2 atmosphere can be removed by carbonate precipitation alone in about a half-billion years. This is roughly fifty times longer than earlier estimates, which were not based on time-varying models. The longer atmospheric lifetime may be enough to explain the large number of channels, formed by aqueous erosion, which is seen on older Martian terrain.
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