Journal article

The effects of diagenesis on geochemical paleoredox proxies in sedimentary carbonates

Ashleigh von S Hood, Noah J Planavsky, Malcolm W Wallace, Xiangli Wang



Metal and metal isotope records in carbonates have the potential to provide novel insights into ancient ocean–atmosphere redox conditions, paleoenvironmental conditions, and biogeochemical cycling. However, trace element geochemical signatures in carbonates can record either diagenetic or depositional signatures. Here we explore the variability in uranium isotopes, trace metal and rare earth element + yttrium (REY) concentrations in carbonate successions that have undergone several common types of diagenetic alteration. Case studies include the Cryogenian Balcanoona Reef, Australia (marine dolomitization, neomorphism); the Devonian Canning Basin reefs, Australia (burial dolomitization, karst..

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Awarded by Australian Research Council Discovery Grant

Funding Acknowledgements

We would like to thank the editor Stefan Weyer; Stephen Romaniello, Huyue Song, Rachel Wood and three anonymous reviewers for their helpful comments which significantly improved the manuscript. This work was supported by the U.S. National Science Foundation Earth-Life Transitions Program, and the Alternative Earths NASA Astrobiology Institute (NAI). A.v.S.H. acknowledges the support of a NAI Postdoctoral Fellowship and the Elizabeth and Vernon Puzey Fellowship at the University of Melbourne. M.W.W. acknowledges support from an Australian Research Council Discovery Grant DP130102240. Additionally A.v.S.H. would like to thank E. Bellefroid and B. Kalderon-Asael for assistance in the lab, and C. Reed at Teck Ltd. for discussion.