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dc.contributor.authorRichardson, Jocelyn A.
dc.contributor.authorNewville, Matthew
dc.contributor.authorLanzirotti, Antonio
dc.contributor.authorWebb, Samuel M.
dc.contributor.authorRose, Catherine V.
dc.contributor.authorCatalano, Jeffrey G.
dc.contributor.authorFike, David A.
dc.identifier.citationRichardson , J A , Newville , M , Lanzirotti , A , Webb , S M , Rose , C V , Catalano , J G & Fike , D A 2019 , ' Depositional and diagenetic constraints on the abundance and spatial variability of carbonate-associated sulfate ' , Chemical Geology , vol. 523 , pp. 59-72 .
dc.identifier.otherPURE: 259185741
dc.identifier.otherPURE UUID: 1563233b-df59-4648-8844-f45b8122741d
dc.identifier.otherRIS: urn:19CA1DDC59CB27A85186E257B1171228
dc.identifier.otherORCID: /0000-0001-8149-0977/work/58285634
dc.identifier.otherScopus: 85067255113
dc.identifier.otherWOS: 000480333200006
dc.descriptionAcknowledgment is made to the donors of the American Chemical Society Petroleum Research Fund (#57548-ND2) for partial support of this research.en
dc.description.abstractMarine carbonate rocks are composed, in varying abundance, of cement, micrite, abiotic grains and fossils, which can provide information about the physical and chemical environments in which they formed. Geochemical analyses of these carbonates are not always interpreted alongside the wealth of geologic (including petrographic) information available, resulting in potentially faulty reconstructions of biogeochemical and environmental conditions. These concerns have prompted closer scrutiny of the effect of depositional lithofacies and diagenesis on carbonate proxies. Here, we have combined X-ray Absorption Near Edge Structure (XANES) spectroscopy and μ-X-ray Fluorescence (μ-XRF) imaging to map the speciation and abundance of sulfur in carbonate petrographic thin sections in Upper Ordovician carbonates from Anticosti Island, Canada and early Silurian carbonates from Gotland, Sweden, across multiple depositional facies. Lithofacies and fossil communities between Anticosti Island and Gotland are similar, which allows for comparison of changes in the dominant S species and their abundance in separate basins, associated with variations in (glacio)eustatic sea level. Sulfide abundance is greatest in mudstone, wackestone and packstone facies, where interstitial micrite hosts abundant pyrite. Sulfate abundance, as carbonate-associated sulfate (CAS), varies within individual fossil fragments, as well as within the same fossil phylum and is particularly high in unaltered brachiopods. In contrast, sulfate abundance is generally very low in micrite (near the detection limit) and generally arises in situ from sulfide that has been oxidized as opposed to true CAS. In different cement fabrics, sulfate abundance is greatest in drusy, pore-filling cements. Organic sulfur compounds are also detected and, although low in abundance, are mostly found within micrite. The detection and characterization of both inorganic sulfur and organic sulfur compounds provides a platform to understand early processes of biomineralization. This approach will broaden our understanding of the source of inorganically bound sulfate in ancient carbonates, as well as the effect of depositional setting and diagenesis on CAS incorporation, (re)mobilization, and ultimate abundance in sedimentary carbonates. Additionally, this work has implications for the CAS isotopic value of individual carbonate components that may affect interpretations of stratigraphic variability of numerous CAS sections throughout Earth history.
dc.relation.ispartofChemical Geologyen
dc.rightsCopyright © 2019 Elsevier B.V. All rights reserved. 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 may differ slightly from the final published version. The final published version of this work is available at
dc.subjectCarbonate-associated sulfateen
dc.subjectXANES spectroscopyen
dc.subjectμ-XRF imagingen
dc.subjectDepositional environmenten
dc.subjectSulfur isotopesen
dc.subjectGE Environmental Sciencesen
dc.subjectQD Chemistryen
dc.subjectSDG 14 - Life Below Wateren
dc.titleDepositional and diagenetic constraints on the abundance and spatial variability of carbonate-associated sulfateen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. School of Earth & Environmental Sciencesen
dc.description.statusPeer revieweden

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