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dc.contributor.authorStueeken, Eva Elisabeth
dc.contributor.authorViehmann, Sebastian
dc.contributor.authorHohl, Simon
dc.identifier.citationStueeken , E E , Viehmann , S & Hohl , S 2023 , ' Exploring the effects of residence time on the utility of stable isotopes and S/C ratios as proxies for ocean connectivity ' , ACS Earth and Space Chemistry , vol. 7 , no. 7 , pp. 1337–1349 .
dc.identifier.otherORCID: /0000-0001-6861-2490/work/138748307
dc.descriptionFunding: UK Natural Environment Research Council - NE/V010824/1.en
dc.description.abstractVarious geochemical proxies have been developed to determine if ancient sedimentary strata were deposited in marine or nonmarine environments. A critical parameter for proxy reliability is the residence time of aqueous species in seawater, which is rarely considered for proxies relying on stable isotopes and elemental abundance ratios. Differences in residence time may affect our ability to track geologically short-lived alternations between marine and nonmarine conditions. To test this effect for sulfur and nitrogen isotopes and sulfur/carbon ratios, we investigated a stratigraphic section in the Miocene Oberpullendorf Basin in Austria. Here, previous work revealed typical seawater-like rare earth element and yttrium (REY) systematics transitioning to nonmarine-like systematics. This shift was interpreted as a brief transition from an open marine depositional setting to a restricted embayment with a reduced level of exchange with the open ocean and possibly freshwater influence. Our isotopic results show no discernible response in carbonate-associated sulfate sulfur isotopes and carbon/sulfur abundance ratios during the interval of marine restriction inferred from the REY data, but nitrogen isotopes show a decrease by several permil. This observation is consistent with the much longer residence time of sulfate in seawater compared with REY and nitrate. Hence, this case study illustrates that the residence time is a key factor for the utility of seawater proxies. In some cases, it may make geochemical parameters more sensitive to marine water influx than paleontological observations, as in the Oberpullendorf Basin. Particular care is warranted in deep time, when marine residence times likely differ markedly from the modern.
dc.relation.ispartofACS Earth and Space Chemistryen
dc.subjectNitrogen isotopesen
dc.subjectSulfur isotopesen
dc.subjectNonmarine environmentsen
dc.subjectResidence timeen
dc.subjectQE Geologyen
dc.titleExploring the effects of residence time on the utility of stable isotopes and S/C ratios as proxies for ocean connectivityen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. School of Earth & Environmental Sciencesen
dc.contributor.institutionUniversity of St Andrews. St Andrews Centre for Exoplanet Scienceen
dc.description.statusPeer revieweden

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