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Selenium Isotope Paleobiogeochemistry

Selenium Isotope Paleobiogeochemistry

Paperback

Series: Elements in Geochemical Tracers in Earth System Science

General Science

ISBN10: 110874916X
ISBN13: 9781108749169
Publisher: Cambridge University Press
Published: Oct 8 2020
Pages: 30
Weight: 0.12
Height: 0.06 Width: 6.00 Depth: 9.00
Language: English
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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