The attraction of selenium isotopes as a paleoenvironmental tracer
lies in the high redox potential of selenium oxyanions (SeIV and
SeVI), the dominant species in the modern ocean. The largest
isotopic fractionations occur during oxyanion reduction, which
makes selenium isotopes a sensitive proxy for the redox evolution
of our planet. As a case study we review existing data from the
Neoarchean and Paleoproterozoic, which show that significant
isotopic fractionations are absent until 2.5 Ga, and prolonged
isotopic deviations only appear around 2.3 Ga. Selenium isotopes
have thus begun to reveal complex spatiotemporal redox patterns not
reflected in other proxies.
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