If all living things were magically rendered dead?

It seems to me that there will always be oxygen in the atmosphere. Oxygen can be produced from the decomp and reactions involving a multitude of oxides. The amount would be dramatically less than today's level but once the element is introduced into the system it would be hard to totally eliminate it. It's like trying to totally eliminate a recessive allele from a gene pool. Also volcanic activity has a hand in keeping the atmosphere rich in oxygen. a href="http://www.sciencedaily.com/releases/2007/08/070829143713.htm" rel="nofollow"http://www.sciencedaily.com/releases/200…/a