Origins of sulphur in rocks tells early oxygen story
Friday, April 17, 2009 - 07:56
in Earth & Climate
Sedimentary rocks created more than 2.4 billion years ago sometimes have an unusual sulphur isotope composition thought to be caused by the action of ultra violet light on volcanically produced sulphur dioxide in an oxygen poor atmosphere. Now a team of geochemists can show an alternative origin for this isotopic composition that may point to an early, oxygen-rich atmosphere...