Copper isotopes and Great Oxidation Event

Researchers report that copper (Cu) in marine black shales changed in isotopic composition from 63Cu-enriched to 65Cu-enriched between 2.66 and 2.08 billion years ago, and suggest that the isotopic shift reflects the Great Oxidation Event, a period when banded iron formation, a process that may have preferentially sequestered marine 65Cu, decreased and oxygen-associated weathering of 65Cu-enriched continental sulfides may have increased. - Read at PNAS.org

Article #15-23544: “Cu isotopes in marine black shales record the Great Oxidation Event,” by Ernest Chi Fru et al.