A Reducing Atmosphere From Out-gassing of the Early Earth

Details A Reducing Atmosphere From Out-gassing of the Early Earth A Reducing Atmosphere From Out-gassing of the Early Earth

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005dps....37.2915s&link_type=abstract

American Astronomical Society, DPS meeting #37, #29.15; Bulletin of the American Astronomical Society, Vol. 37, p.676

Biology

1

Scientific paper

Earth's present atmosphere originated from out-gassing of volatile-bearing grains. We calculated the composition of volatiles out-gassed from chondritic planetary bodies. We present results for average CI, CM, CV, H, L, and EH chondrites, which are the building blocks of the Earth. From the oxygen-isotope mixing (OIM) model, we calculated a composition of 70% EH, 21% H, 5% CV, and 4% CI chondritic matter for the early Earth. The major out-gassed volatiles for these starting compositions are CH4, N2, NH3, H2, and H2O. The Miller-Urey experiment demonstrated that a reducing atmosphere like this generates amino acids and other organic compounds that are essential for the formation of life. This work is supported by the NASA Astrobiology Program.
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