AI Article Synopsis
- The exchange between Earth's early magma ocean and vapor played a crucial role in forming the planet's first atmosphere, influenced by the oxygen fugacity (O) related to the iron content in the magma.
- At a specific composition, the magma ocean's O creates a carbon monoxide-rich atmosphere, similar to conditions observed on Venus.
- Differences between Earth's atmosphere and those of other planets are attributed to its position and size, which enabled stable oceans and the eventual emergence of life.
Article Abstract
Exchange between a magma ocean and vapor produced Earth's earliest atmosphere. Its speciation depends on the oxygen fugacity (O) set by the Fe/Fe ratio of the magma ocean at its surface. Here, we establish the relationship between O and Fe/Fe in quenched liquids of silicate Earth-like composition at 2173 K and 1 bar. Mantle-derived rocks have Fe/(Fe+Fe) = 0.037 ± 0.005, at which the magma ocean defines an O 0.5 log units above the iron-wüstite buffer. At this O, the solubilities of H-C-N-O species in the magma ocean produce a CO-rich atmosphere. Cooling and condensation of HO would have led to a prebiotic terrestrial atmosphere composed of CO-N, in proportions and at pressures akin to those observed on Venus. Present-day differences between Earth's atmosphere and those of her planetary neighbors result from Earth's heliocentric location and mass, which allowed geologically long-lived oceans, in-turn facilitating CO drawdown and, eventually, the development of life.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7688334 | PMC |
| http://dx.doi.org/10.1126/sciadv.abd1387 | DOI Listing |
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