The actual existing Carbon Dioxide seems to be in the atmosphere in one era of the Earth's history.
CO2 was probably the main gas at accretion start. as supported by James Walker in http://deepblue.lib.umich.edu/bitstream/handle/2027.42/43349/11084_2005_Article_BF01809466.pdf?sequence=1
Thank you very much for this very helpful article. But, then, how did the Carbon combine with Oxygen since this latter was very rare, at this moment ?
You probably meant O2, but H2O and CO2 were primordial, probably as very stable forms over free elements. Water splitting was an early Earth rare event due to the presence of cyanobacteria aggregations http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20120008332.pdf
Thank you dear sir for your help, so that means that CO2 were abundant in the primal earth, but was it in the atmosphere in a great amount in one era of this earth or rather in the primitive ocean ?
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