{"refrec":{"BRefID":356399,"RR":"<b>Kipp, M.A.; Li, H.; Ellwood, M.J.; John, S.G.; Middag, R.; Adkins, J.F.; Tissot, F.L.H.</b> (2022). <sup>238</sup>U, <sup>235</sup>U and <sup>234</sup>U in seawater and deep-sea corals: A high-precision reappraisal. <i>Geochim. Cosmochim. Acta 336</i>: 231-248. <a href=\"https://dx.doi.org/10.1016/j.gca.2022.09.018\" target=\"_blank\">https://dx.doi.org/10.1016/j.gca.2022.09.018</a>","BEntID":354113,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Geochim. Cosmochim. Acta 336</i>: 231-248. <a href=\"https://dx.doi.org/10.1016/j.gca.2022.09.018\" target=\"_blank\">https://dx.doi.org/10.1016/j.gca.2022.09.018</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Kipp, M.A.; Li, H.; Ellwood, M.J.; John, S.G.; Middag, R.; Adkins, J.F.; Tissot, F.L.H.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Kipp, M.A. <i>et al.</i>","Englishabstract":"<p>    Uranium    <a        href=\"https://www.sciencedirect.com/topics/earth-and-planetary-sciences/isotope-ratios\"        title=\"Learn more about isotope ratios from ScienceDirect's AI-generated Topic Pages\"    >        isotope ratios    </a>    are widely utilized in    <a        href=\"https://www.sciencedirect.com/topics/earth-and-planetary-sciences/paleoceanography\"        title=\"Learn more about paleoceanography from ScienceDirect's AI-generated Topic Pages\"    >        paleoceanography    </a>    . The <sup>238</sup>U/<sup>235</sup>U ratio (expressed as δ<sup>238</sup>U)is leveraged as a proxy for the areal extent of anoxic seafloor, and the<sup>234</sup>U/<sup>238</sup>U ratio (expressed as δ<sup>234</sup>U    <sub>sec</sub>) tracks riverine and estuarine inputs to the ocean, in    addition to featuring prominently in U-series    <a        href=\"https://www.sciencedirect.com/topics/earth-and-planetary-sciences/geochronology\"        title=\"Learn more about geochronology from ScienceDirect's AI-generated Topic Pages\"    >        geochronology    </a>    . Both of these ratios are thought to be recorded by biological carbonates    precipitating from seawater, with corals serving as one of the most    commonly-used archives of seawater U isotope ratios in the past. The    utility of the U isotope proxy in biological carbonate archives relies not    only on this faithful archiving of ambient seawater signatures, but also on    the    <a        href=\"https://www.sciencedirect.com/topics/earth-and-planetary-sciences/homogeneity\"        title=\"Learn more about homogeneity from ScienceDirect's AI-generated Topic Pages\"    >        homogeneity    </a>    of the seawater U isotope composition, which enables samples to be    leveraged as proxy for the entire ocean.</p><p>    Here we revisit the foundational assumption of homogeneity of the marine U    reservoir, and the capacity of deep-sea corals to record the U    <a        href=\"https://www.sciencedirect.com/topics/earth-and-planetary-sciences/isotopic-composition\"        title=\"Learn more about isotopic composition from ScienceDirect's AI-generated Topic Pages\"    >        isotopic composition    </a>    of ambient seawater. We begin by evaluating the analytical limits ofprecision and accuracy achievable for both δ<sup>238</sup>U and δ    <sup>234</sup>U<sub>sec</sub> analysis by MC-ICP-MS. We then report data    for 45 seawater and 26 deep-sea coral samples from multiple sites aroundthe world. We find subtle δ<sup>238</sup>U and δ<sup>234</sup>U    <sub>sec</sub> heterogeneity that correlates with U concentrations, which    allows us to calculate new salinity-normalized global mean seawater values    for δ<sup>238</sup>U (−0.379 ± 0.023 ‰) and δ<sup>234</sup>U<sub>sec</sub>    (+145.55 ± 0.28 ‰). At each site, biological carbonates act as precisearchives of the seawater δ<sup>238</sup>U value. The same is true for δ    <sup>234</sup>U<sub>sec</sub>, with a few exceptions where samples appearto show vital effects that cause intra-sample <sup>234</sup>U/    <sup>238</sup>U re-partitioning. In sum, these observations support    deep-sea corals as a robust archive of seawater U isotope ratios, but    highlight the importance of utilizing multiple sample sites and replicateanalyses to overcome coral vital effects (for δ<sup>234</sup>U    <sub>sec</sub>) and subtle marine U isotopic heterogeneity.</p>","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"<sup>238</sup>U, <sup>235</sup>U and <sup>234</sup>U in seawater and deep-sea corals: A high-precision reappraisal","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-06-10 01:32:46.276361","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Uranium; GEOTRACES; <i>D. dianthus</i>; Paleo-redox","OtherDescriptors":null,"Notes":null,"AnaPub":2022,"MonPub":null,"DateUpdate":"2023-01-25","DateCreate":"2022-10-14","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000875978300004","VABBcode":null,"OpenAcc":1,"DOI":"10.1016/j.gca.2022.09.018"},"refs":null,"anarec":{"AnaID":356399,"PubliDate":2022,"Pagination":"231-248","XtraPublOfAnaID":null,"ISBN":null,"Volume":"336","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":42901,"SerRR":"Geochimica et Cosmochimica Acta. 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