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These deposits of marine hematite and quartz represent a precipitation of dissolved iron from sea water as the dissolved oxygen content of the water increased. After 1800 mya, Banded iron formations are rare, but terrestrial red beds are common for the first time suggesting that iron is being oxidised and precipitated in soils and rocks on land in the source area of sediments instead of being dissolved and carried into the oceans in its unoxidised form...
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Thus, it has been reasoned that the BIF-red bed transition marks the rise of atmospheric oxygen. Complimentary information comes from detrital uraninite in Archean and earliest Proterozoic alluvial rocks. Because this uranium mineral can survive prolonged transport only in media containing little or no oxygen, the lack of detrital uraninite deposits younger than 2300 ma also points towards a significant environmental transition (Roscoe,1969)...
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