[meteorite-list] Mars Had Oxygen-Rich Atmosphere Four Billion Years Ago

[Paul H.]

Mars Had Oxygen-Rich Atmosphere Four Billion Years Ago
(The oxygen was either produced by life forms or by a 
chemical reaction in the atmosphere of Mars) The Guardian
(Associated Press) June 19, 2013
http://www.guardian.co.uk/science/2013/jun/19/mars-oxygen-rich-atmosphere

Mars Had Oxygen-Rich Atmosphere 4,000 Million Years Ago, 
Science Daily, June 19, 2013
http://www.sciencedaily.com/releases/2013/06/130619132446.htm

The paper is:

Tuff, J., J. Wade, and B. J. Wood, 2013, Volcanism on Mars 
controlled by early oxidation of the upper mantle. Nature, 
vol. 498, no. 7454, pp. 342-345. DOI: 10.1038/nature12225
http://www.nature.com/nature/journal/v498/n7454/full/nature12225.html

Yours,

Paul H.