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Calcite crystal growth orientation: implications for trace metal uptake into coccoliths

Published online by Cambridge University Press:  05 July 2018

V. E. Payne ,
R. E. M. Rickaby ,
L. G. Benning  and
S. Shaw
V. E. Payne*
Affiliation:
School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK
R. E. M. Rickaby
Affiliation:
Department of Earth Sciences, Oxford University, Parks Road, Oxford, OX1 3PR, UK
L. G. Benning
Affiliation:
School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK
S. Shaw
Affiliation:
School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK
*
*E-mail: [email protected]
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Abstract

Inorganic calcite precipitation experiments were conducted to determine whether inducing specific orientations of calcite crystal growth can cause the enrichment of cations larger than Ca. Malonic acid (CH2(COOH)), a di-carboxylic acid, was used to poison growth on acute kink sites, promoting growth on obtuse kink sites, causing calcite crystals elongated along their c-axes to form in a mechanism similar to that seeninthe growth of E. huxleyi coccoliths. Calcite was precipitated with a range of malonic acid concentrations (0 to 10-1 M), and 9x10-5 M of either SrCl2 or MgCl2. The results show that calcite crystals precipitated in the presence of large malonic acid concentrations show significant elongation along the c axis, and suggest that increasing malonate concentrations corresponded with increasing DSr. Experiments with 10-1 M malonic acid caused elevated DSr comparable to that predicted for E. huxleyi coccolith calcite (Langer et al., 2006).

Type
Research Article
Information
Mineralogical Magazine , Volume 72 , Issue 1 , February 2008 , pp. 269 - 272
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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