Such caveats suggest that these Algoma-type iron formations cannot be used to infer Cr inputs from continental weathering ... shelf environments (see, for example, ref. 17) and are well suited ...

This is because the Precambrian sulfur cycle was dominated by a reduced sedimentary reservoir (pyrite), which after surface oxidation in weathering was soon reduced again and buried, whereas the ...

Mössbauer spectroscopy is used to quantify how much iron exists in what oxidation states in a sample ... microbes have a direct effect on rock weathering—that bacteria oxidize iron, leading ...

The study, "Pyrite oxidation drives exceptionally high weathering rates and geologic CO 2 release in mountaintop-mined landscapes," was published in the journal Global Biogeochemical Cycles.