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dc.contributor.authorFinch, Adrian Anthony
dc.contributor.authorAllison, Nicola
dc.date.accessioned2013-03-06T17:01:04Z
dc.date.available2013-03-06T17:01:04Z
dc.date.issued2008-04-19
dc.identifier.citationFinch , A A & Allison , N 2008 , ' Mg structural state in coral aragonite and implications for the paleoenvironmental proxy ' Geophysical Research Letters , vol. 35 , no. 8 , L08704 . https://doi.org/10.1029/2008GL033543en
dc.identifier.issn0094-8276
dc.identifier.otherPURE: 615482
dc.identifier.otherPURE UUID: 8a5a00d6-fd06-46c0-b4ed-f27e1b126075
dc.identifier.otherWOS: 000255201800006
dc.identifier.otherScopus: 48249125871
dc.identifier.otherORCID: /0000-0002-3689-1517/work/38002290
dc.identifier.otherORCID: /0000-0003-3720-1917/work/42594117
dc.identifier.urihttp://hdl.handle.net/10023/3376
dc.description.abstractThermodynamic calculations and inorganic precipitation experiments indicate a relationship between aragonite Mg/Ca and water temperature. This offers a route to reconstruct seawater temperatures from fossil corals. Fundamental to this is the assumption that Mg2+ exchanges for Ca2+ within carbonate. We present X-ray Absorption Fine Structure (XAFS) data to indicate the structural state of Mg in modern Porites coral skeletons. We show Mg is not in aragonite, but hosted by a disordered Mg-bearing material. Mg may be predominantly hosted in organic materials or as a highly disordered inorganic phase, e. g., a nanoparticulate form of Mg carbonate or hydroxide. Reported correlations between seawater temperature and coral Mg/Ca are unlikely to be consistent between corals and hence analysis of Mg/Ca in fossils is unlikely to produce accurate climate reconstructions. We anticipate XAFS will be applied widely to environmental proxies and become an important tool in identifying those that reconstruct accurate climates.
dc.format.extent5
dc.language.isoeng
dc.relation.ispartofGeophysical Research Lettersen
dc.rightsCopyright 2008 by the American Geophysical Union. Deposited according to publisher policy.en
dc.subjectAmorphous Calcium-carbonateen
dc.subjectX-rayen
dc.subjectOrganic matrixen
dc.subjectSkeletonsen
dc.subjectPoritesen
dc.subjectBiomineralizationen
dc.subjectTemperatureen
dc.subjectDiagenesisen
dc.subjectRecordsen
dc.subjectGrowthen
dc.subjectGB Physical geographyen
dc.subjectGE Environmental Sciencesen
dc.subject.lccGBen
dc.subject.lccGEen
dc.titleMg structural state in coral aragonite and implications for the paleoenvironmental proxyen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.Earth and Environmental Sciencesen
dc.contributor.institutionUniversity of St Andrews.School of Geography and Geosciencesen
dc.contributor.institutionUniversity of St Andrews.Marine Alliance for Science & Technology Scotlanden
dc.contributor.institutionUniversity of St Andrews.Scottish Oceans Instituteen
dc.contributor.institutionUniversity of St Andrews.St Andrews Isotope Geochemistryen
dc.identifier.doihttps://doi.org/10.1029/2008GL033543
dc.description.statusPeer revieweden
dc.identifier.urlhttp://www.scopus.com/inward/record.url?scp=48249125871&partnerID=8YFLogxKen


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