Chromium-isotope signatures in scleractinian corals from the Rocas Atoll, Tropical South Atlantic

Geobiology
N S PereiraRobert Frei

Abstract

Chromium-isotope compositions (expressed as δ(53) Cr) of recent and ancient skeletal and non-skeletal carbonates are currently explored as a (paleo-) redox-proxy for shallow seawater. The idea behind this approach is that biogenic and non-biogenic carbonates could potentially be used as archives recording the Cr-isotope composition of seawater in which they formed, and with this contribute to the reconstruction of past paleo-environmental changes in the marine realm, and potentially to climate changes on land. However, investigations addressing the behavior and uptake mechanism of Cr, and the potential isotope fractionations between seawater and biogenic carbonates are scarce. Here, we present a study of Cr-isotope variations in three species of corals and contemporary seawater from the Rocas Atoll, NE, Brazil. Cr-isotope values of the studied coral species (Siderastrea stellata, Porites sp., and Montastrea cavernosa) vary from -0.5 to +0.33‰ and point to significant isotopic disequilibrium with coexisting seawater characterized by a Cr-isotope value of +0.92 ± 0.2‰. This isotopic offset requires reduction of hexavalent Cr(VI) in the sequestration process of all the studied coral species. Cr-isotope values in a profile across a...Continue Reading

References

Jul 1, 1990·Applied and Environmental Microbiology·Y IshibashiS Silver
Jul 15, 2006·Journal of Hazardous Materials·Lin DengNansheng Deng
Apr 11, 2007·Proceedings of the National Academy of Sciences of the United States of America·Christopher OzeScott Fendorf
Mar 22, 2013·Proceedings of the National Academy of Sciences of the United States of America·Christopher T ReinhardTimothy W Lyons
Sep 27, 2013·Nature·Sean A CroweDonald E Canfield

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Citations

Jul 28, 2020·Global Biogeochemical Cycles·David J JanssenSamuel L Jaccard
Sep 28, 2018·Emerging Topics in Life Sciences·Charles W Diamond, Timothy W Lyons
Nov 27, 2019·Analytical Chemistry·Guangliang WuGuilin Han

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