Selenium isotope paleobiogeochemistry
MetadataShow full item record
The attraction of selenium isotopes as a paleoenvironmental tracer lies in the high redox potential of selenium oxyanions (SeIV and SeVI), the two 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.
Stueeken , E E & Kipp , M A 2020 , Selenium isotope paleobiogeochemistry . in T Lyons , A Turchyn & C Reinhard (eds) , Elements in geochemical tracers in earth system science . Cambridge elements , Cambridge University Press , Cambridge , pp. 1-21 . https://doi.org/10.1017/9781108782203
Elements in geochemical tracers in earth system science
Copyright © Eva E. Stüeken and Michael A. Kipp. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the final published version of the work, which was originally published at https://doi.org/10.1017/9781108782203
Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.