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dc.contributor.authorStruve, Torben
dc.contributor.authorvan de Flierdt, Tina
dc.contributor.authorBurke, Andrea
dc.contributor.authorRobinson, Laura F.
dc.contributor.authorHammond, Samantha J.
dc.contributor.authorCrocket, Kirsty C.
dc.contributor.authorBradtmiller, Louisa I.
dc.contributor.authorAuro, Maureen E.
dc.contributor.authorMohamed, Kais J.
dc.contributor.authorWhite, Nicholas J.
dc.date.accessioned2017-03-01T11:30:19Z
dc.date.available2017-03-01T11:30:19Z
dc.date.issued2017-03-20
dc.identifier.citationStruve , T , van de Flierdt , T , Burke , A , Robinson , L F , Hammond , S J , Crocket , K C , Bradtmiller , L I , Auro , M E , Mohamed , K J & White , N J 2017 , ' Neodymium isotopes and concentrations in aragonitic scleractinian cold-water coral skeletons - Modern calibration and evaluation of palaeo-applications ' Chemical Geology , vol. 453 , pp. 146-168 . https://doi.org/10.1016/j.chemgeo.2017.01.022en
dc.identifier.issn0009-2541
dc.identifier.otherPURE: 249016164
dc.identifier.otherPURE UUID: 2db99420-5ae4-460a-8aea-fc1ae3b018ad
dc.identifier.otherRIS: urn:45216FD9FC5E0159C0F65F8F1512E3EE
dc.identifier.otherScopus: 85012890829
dc.identifier.otherWOS: 000396730900012
dc.identifier.urihttp://hdl.handle.net/10023/10384
dc.descriptionTvdF and TS acknowledge financial support for a bursary by the Grantham Institute of Climate Change and the Environment and a Marie Curie Reintegration grant (IRG 230828), as well as funding from the Leverhulme Trust (RPG-398) and the NERC (NE/N001141/1). Additional financial support was provided to LFR by the USGS-WHOI Co-operative agreement, NSF-ANT grants 0636787 and 80295700, The European Research Council, the Leverhulme Trust and a Marie Curie Reintegration grant. LB was supported by a NOAA/UCAR Climate and Global Change Postdoctoral Fellowship and KJM acknowledges funding from a Marie Curie International Outgoing fellowship (IOF 236962).en
dc.description.abstractCold-water corals (CWCs) are unique archives of mid-depth ocean chemistry and have been used successfully to reconstruct the neodymium (Nd) isotopic composition of seawater from a number of species. High and variable Nd concentrations in fossil corals however pose the question as to how Nd is incorporated into their skeletons. We here present new results on modern specimens of Desmophyllum dianthus, Balanophyllia malouinensis, and Flabellum curvatum, collected from the Drake Passage, and Madrepora oculata, collected from the North Atlantic. All modern individuals were either collected alive or uranium-series dated to be < 500 years old for comparison with local surface sediments and seawater profiles. Modern coral Nd isotopic compositions generally agree with ambient seawater values, which in turn are consistent with previously published seawater analyses, supporting small vertical and lateral Nd isotope gradients in modern Drake Passage waters. Two Balanophyllia malouinensis specimens collected live however deviate by up to 0.6 epsilon units from ambient seawater. We therefore recommend that this species should be treated with caution for the reconstruction of past seawater Nd isotopic compositions. Seventy fossil Drake Passage CWCs were furthermore analysed for their Nd concentrations, revealing a large range from 7.3 to 964.5 ng/g. Samples of the species D. dianthus and Caryophyllia spp. show minor covariation of Nd with 232Th content, utilised to monitor contaminant phases in cleaned coral aragonite. Strong covariations between Nd and Th concentrations are however observed in the species B. malouinensis and G. antarctica. In order to better constrain the source and nature of Nd in the cleaned aragonitic skeletons, a subset of sixteen corals was investigated for its rare earth element (REE) content, as well as major and trace element geochemistry. Our new data provide supporting evidence that the applied cleaning protocol efficiently removes contaminant lithogenic and ferromanganese oxyhydroxide phases. Mass balance calculations and seawater-like REE patterns rule out lithogenic and ferromanganese oxyhydroxide phases as a major contributor to elevated Nd concentrations in coral aragonite. Based on mass balance considerations, geochemical evidence, and previously published independent work by solid-state nuclear magnetic resonance (NMR) spectroscopy, we suggest authigenic phosphate phases as a significant carrier of skeletal Nd. Such a carrier phase could explain sporadic appearance of high Nd concentrations in corals and would be coupled with seawater-derived Nd isotopic compositions, lending further confidence to the application of Nd isotopes as a water mass proxy in CWCs.
dc.format.extent23
dc.language.isoeng
dc.relation.ispartofChemical Geologyen
dc.rights© 2017 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).en
dc.subjectNeodymium isotopesen
dc.subjectRare earth elementsen
dc.subjectCold-water coralsen
dc.subjectSeawateren
dc.subjectSedimentsen
dc.subjectDrake Passageen
dc.subjectGE Environmental Sciencesen
dc.subjectNDASen
dc.subject.lccGEen
dc.titleNeodymium isotopes and concentrations in aragonitic scleractinian cold-water coral skeletons - Modern calibration and evaluation of palaeo-applicationsen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.Earth and Environmental Sciencesen
dc.contributor.institutionUniversity of St Andrews.St Andrews Isotope Geochemistryen
dc.identifier.doihttps://doi.org/10.1016/j.chemgeo.2017.01.022
dc.description.statusPeer revieweden


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