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Earth's atmosphere is composed primarily of N2 and O2. The origin of free O2 in the early Earth's atmosphere is still subject of considerable debate. 1 Theoretical models sug- gest that the initial form of free O2 in the atmosphere has been oceanic H2O. Recent compu- tation modelling has suggested that a superheated (ca. 2000 K) H2O vapor atmosphere of 1.410 21 kg (the present mass of the oceans) lasting for about 3000 y could probably have been formed on Earth by an enormous (ca. 10 28 J) asteroid impact. In this report, the occur- rence of the thermochemical dissociation of the vapor, creating a primitive oxygenic (ca. 0.1 of the present level (PAL) of free O2) atmosphere.

Thermochemical equilibrium calculations of high-temperature O2 generation on the early Earth: Giant asteroid impact on land