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Trace and major element incorporation into amorphous calcium carbonate (ACC) precipitated from seawater

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Evans_2020_GCA_Trace_AAM.pdf (18.32Mb)
Date
09/09/2020
Author
Evans, David
Gray, William R.
Rae, James W. B.
Greenop, Rosanna
Webb, Paul B.
Penkman, Kirsty
Kroger, Roland
Allison, Nicola
Keywords
GE Environmental Sciences
DAS
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Abstract
Amorphous calcium carbonate (ACC) has been identified or inferred to exist in many groups of marine organisms that produce biominerals widely used as geochemical archives (e.g. foraminifera, molluscs, echinoderms). However, little is known about trace element incorporation into ACC, and thus it is not understood how precipitation through an ACC precursor might impact the fidelity of climate proxies and biomineralisation models built on the skeletal geochemistry of these marine calcifiers. To address this, we investigated the incorporation of Li, B, Na, Mg, Mn, Sr, Ba, and U into inorganic amorphous calcium magnesium carbonates precipitated from seawater under a variety of different carbonate chemistries, Mg/Ca ratios, and in the presence of aspartic and glutamic acid, two of the most common intracrystalline amino acids found in foraminifera and corals. ACC is highly enriched in most of these trace elements relative to the crystalline carbonates yet similar in some respects in terms of the factors influencing trace element partitioning. For example, ACC B/Ca is sensitive to the carbonate system, whilst Mg/Ca and Sr/Ca are largely a function of their respective ratio in seawater. In general, we find that most of the variance in the distribution coefficients of the other trace elements can be explained by some combination of the seawater carbonate chemistry and the seawater or ACC Mg/Ca ratio.
Citation
Evans , D , Gray , W R , Rae , J W B , Greenop , R , Webb , P B , Penkman , K , Kroger , R & Allison , N 2020 , ' Trace and major element incorporation into amorphous calcium carbonate (ACC) precipitated from seawater ' , Geochimica et Cosmochimica Acta , vol. In press . https://doi.org/10.1016/j.gca.2020.08.034
Publication
Geochimica et Cosmochimica Acta
Status
Peer reviewed
DOI
https://doi.org/10.1016/j.gca.2020.08.034
ISSN
0016-7037
Type
Journal article
Rights
Copyright © 2020 Elsevier Ltd. All rights reserved. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1016/j.gca.2020.08.034
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/23926

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