Carbon dioxide on the early earth

Details Carbon dioxide on the early earth Carbon dioxide on the early earth

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985orli...16..117w&link_type=abstract

Origins of Life (ISSN 0302-1688), vol. 16, no. 2, 1985, p. 117-127.

Mathematics

Logic

41

Carbon Dioxide Concentration, Geochemistry, Planetary Atmospheres, Planetary Evolution, Primitive Earth Atmosphere, Degassing, Earth (Planet), Mass Balance, Oceanography, Partial Pressure, Sediments, Thermodynamic Equilibrium

Scientific paper

This paper uses arguments of geochemical mass balance to arrive at an estimate of the partial pressure of carbon dioxide in the terrestrial atmosphere very early in earth history. It appears that this partial pressure could have been as large as 10 bars. This large estimate depends on two key considerations. First, volatiles were driven out of the interior of the earth during the course of earth accretion or very shortly thereafter. This early degassing was a consequence of rapid accretion, which gave the young earth a hot and rapidly convecting interior. Second, the early earth lacked extensive, stable continental platforms on which carbon could be stored in the form of carbonate minerals for geologically significant periods of time. In the absence of continental platforms on the early earth, the earth's carbon must have been either in the atmosphere or ocean or in the form of shortlived sedimentary deposits on ephemeral sea floor.

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