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Mg structural state in coral aragonite and implications for the paleoenvironmental proxy

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Finch2008GeophysicalResearchLett35MgStructualState.pdf (137.3Kb)
Date
19/04/2008
Author
Finch, Adrian Anthony
Allison, Nicola
Keywords
Amorphous Calcium-carbonate
X-ray
Organic matrix
Skeletons
Porites
Biomineralization
Temperature
Diagenesis
Records
Growth
GB Physical geography
GE Environmental Sciences
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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.
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
Publication
Geophysical Research Letters
Status
Peer reviewed
DOI
https://doi.org/10.1029/2008GL033543
ISSN
0094-8276
Type
Journal article
Rights
Copyright 2008 by the American Geophysical Union. Deposited according to publisher policy.
Collections
  • University of St Andrews Research
URL
http://www.scopus.com/inward/record.url?scp=48249125871&partnerID=8YFLogxK
URI
http://hdl.handle.net/10023/3376

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