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Sulfur story unearths oxygen environment
by
Mike Brown, RSC
—
last modified
11-10-10 06:15 AM
Copyright 2010, RSC
Rock samples taken from Stoer Bay near Lochinver suggest that complex life may have been present on Earth millions of years earlier than thought © Stephen Bowden
Earth's atmosphere could have supported complex life 400 million years earlier than thought, according to sulfur isotope signatures found in some of the oldest rocks on Earth.
John Parnell and colleagues at University of Aberdeen, UK analysed the change in ratio of 34S to 32S in sulfate versus sulfide in the ancient rock samples, allowing them to get a glimpse of the environment in which the rocks were formed. More...
http://www.rsc.org/chemistryworld/News/2010/November/10111001.asp
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