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Mg structural state in coral aragonite and implications for the paleoenvironmental proxy
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dc.contributor.author | Finch, Adrian Anthony | |
dc.contributor.author | Allison, Nicola | |
dc.date.accessioned | 2013-03-06T17:01:04Z | |
dc.date.available | 2013-03-06T17:01:04Z | |
dc.date.issued | 2008-04-19 | |
dc.identifier.citation | Finch , 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/10.1029/2008GL033543 | en |
dc.identifier.issn | 0094-8276 | |
dc.identifier.other | PURE: 615482 | |
dc.identifier.other | PURE UUID: 8a5a00d6-fd06-46c0-b4ed-f27e1b126075 | |
dc.identifier.other | WOS: 000255201800006 | |
dc.identifier.other | Scopus: 48249125871 | |
dc.identifier.other | ORCID: /0000-0002-3689-1517/work/38002290 | |
dc.identifier.other | ORCID: /0000-0003-3720-1917/work/42594117 | |
dc.identifier.uri | https://hdl.handle.net/10023/3376 | |
dc.description.abstract | Thermodynamic 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.extent | 5 | |
dc.language.iso | eng | |
dc.relation.ispartof | Geophysical Research Letters | en |
dc.rights | Copyright 2008 by the American Geophysical Union. Deposited according to publisher policy. | en |
dc.subject | Amorphous Calcium-carbonate | en |
dc.subject | X-ray | en |
dc.subject | Organic matrix | en |
dc.subject | Skeletons | en |
dc.subject | Porites | en |
dc.subject | Biomineralization | en |
dc.subject | Temperature | en |
dc.subject | Diagenesis | en |
dc.subject | Records | en |
dc.subject | Growth | en |
dc.subject | GB Physical geography | en |
dc.subject | GE Environmental Sciences | en |
dc.subject.lcc | GB | en |
dc.subject.lcc | GE | en |
dc.title | Mg structural state in coral aragonite and implications for the paleoenvironmental proxy | en |
dc.type | Journal article | en |
dc.contributor.sponsor | NERC | en |
dc.description.version | Publisher PDF | en |
dc.contributor.institution | University of St Andrews. Earth and Environmental Sciences | en |
dc.contributor.institution | University of St Andrews. School of Geography and Geosciences | en |
dc.contributor.institution | University of St Andrews. Marine Alliance for Science & Technology Scotland | en |
dc.contributor.institution | University of St Andrews. Scottish Oceans Institute | en |
dc.contributor.institution | University of St Andrews. St Andrews Isotope Geochemistry | en |
dc.identifier.doi | https://doi.org/10.1029/2008GL033543 | |
dc.description.status | Peer reviewed | en |
dc.identifier.url | http://www.scopus.com/inward/record.url?scp=48249125871&partnerID=8YFLogxK | en |
dc.identifier.grantnumber | en |
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