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The researchers assessed the distribution of two chromium isotopes, Chromium-53 and Chromium-52, in 3-billion-year-old sediment in South Africa’s Kwazulu-Natal Province. Since Chromium-53 becomes soluble when oxidized, and Chromium-52 is less affected, the relative distribution of the two furnishes a reliable measure of the extent to which the rocks have been exposed to oxygen.
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