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dc.contributor.authorRose, Catherine V.
dc.contributor.authorWebb, Samuel M.
dc.contributor.authorNewville, Matthew
dc.contributor.authorLanzirotti, Antonio
dc.contributor.authorRichardson, Jocelyn A.
dc.contributor.authorTosca, Nicolas J.
dc.contributor.authorCatalano, Jeffrey G
dc.contributor.authorBradley, Alexander S.
dc.contributor.authorFike, David A.
dc.identifier.citationRose , C V , Webb , S M , Newville , M , Lanzirotti , A , Richardson , J A , Tosca , N J , Catalano , J G , Bradley , A S & Fike , D A 2019 , ' Insights into past ocean proxies from micron-scale mapping of sulfur species in carbonates ' , Geology , vol. 47 , no. 9 , 833 , pp. 833-837 .
dc.identifier.otherPURE: 259600201
dc.identifier.otherPURE UUID: 4f81c6e9-b015-443e-b5c7-8272589aff30
dc.identifier.otherORCID: /0000-0001-8149-0977/work/59464971
dc.identifier.otherScopus: 85072026804
dc.identifier.otherWOS: 000483606500011
dc.descriptionLaboratory work and analyses were supported by a Steve Fossett Fellowship awarded to Rose; a U.S. Department of Energy (DOE) Biological and Environmental Research grant (DE-SC0014613), U.S. National Science Foundation (NSF) grants (EAR-0951509, 1229370), an Agouron Institute (California, USA) grant, a Packard (The David and Lucile Packard Foundation, California, USA) Fellowship, and a Hanse-Wissenschaftskolleg (Germany) Fellowship awarded to Fike; and an NSF Career Grant (EAR-1056480) awarded to Catalano. Use of the Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory (California, USA), is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under contract DE-AC02-76SF00515. GeoSoilEnviroCARS is supported by the NSF–Earth Sciences (EAR-1634415) and DOE–GeoSciences (DE-FG02-94ER14466).en
dc.description.abstractGeological reconstructions of global ocean chemistry and atmospheric oxygen concentrations over Earth history commonly rely on the abundance and stable isotopic composition (δ34S) of sulfur-bearing compounds. Carbonate-associated sulfate (CAS), sulfate bound within a calcium carbonate mineral matrix, is among the most commonly interrogated sulfur mineral phases. However, recent work has revealed variability in δ34SCAS values that cannot be explained by evolution of the marine sulfate reservoir, challenging the common interpretation that CAS is inherently a high-fidelity record of seawater sulfate. To investigate the source of this inconsistency, we used X-ray spectromicroscopy to map the micron-scale distribution of S-bearing sedimentary phases in Ordovician-aged (ca. 444 Ma) shallow marine carbonates from Anticosti Island, Québec, Canada. Clear differences in the abundance of CAS are observed between cements and fossils, suggesting that variance in bulk-rock data could be a consequence of component mixing and that coupled synchrotron-petrographic screening can identify the carbonate components that are most likely to retain primary CAS. Furthermore, we observe multiple, distinct forms of sulfate (both inorganic and organic). Differences in these forms among fossil clades could provide new insights into biomineralization mechanisms in extinct organisms.
dc.rights© 2019 Geological Society of America. This work has been made available online in accordance with the publisher’s policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at
dc.subjectGE Environmental Sciencesen
dc.subjectQE Geologyen
dc.subjectSDG 14 - Life Below Wateren
dc.titleInsights into past ocean proxies from micron-scale mapping of sulfur species in carbonatesen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. School of Earth & Environmental Sciencesen
dc.description.statusPeer revieweden

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