Hostname: page-component-848d4c4894-pjpqr Total loading time: 0 Render date: 2024-06-26T10:25:25.240Z Has data issue: false hasContentIssue false
  • English
  • Français

Pseudomorphic replacement of single calcium carbonate crystals by polycrystalline apatite

Published online by Cambridge University Press:  05 July 2018

A. Kasioptas ,
C. Perdikouri ,
C. V. Putnis  and
A. Putnis
A. Kasioptas*
Affiliation:
Institute of Mineralogy, University of Münster, Corrensstrasse 24, 48149, Münster, Germany
C. Perdikouri
Affiliation:
Institute of Mineralogy, University of Münster, Corrensstrasse 24, 48149, Münster, Germany
C. V. Putnis
Affiliation:
Institute of Mineralogy, University of Münster, Corrensstrasse 24, 48149, Münster, Germany
A. Putnis
Affiliation:
Institute of Mineralogy, University of Münster, Corrensstrasse 24, 48149, Münster, Germany
*
*E-mail: akasiop@uni-muenster.de
Get access Rights & Permissions [Opens in a new window]

Abstract

During chemical weathering and natural hydrothermal reactions, apatite can form by replacing calcium carbonates. In hydrothermal experiments in which aragonite and calcite single crystals have been reacted with phosphate solutions, the carbonates are replaced by polycrystalline hydroxylapatite (HAP). In both cases the crystals have retained their overall morphology while their compositions have changed significantly. The HAP appears to have a crystallographic relationship to the parent carbonate crystals. The textural relationships are consistent with an interface-coupled dissolution-precipitation mechanism. Structural relationships and relative molar volumes and solubilities appear to be factors that greatly affect replacement reactions.

Keywords

apatitearagonitecalcitepseudomorphismreplacement
Type
Research Article
Information
Mineralogical Magazine , Volume 72 , Issue 1 , February 2008 , pp. 77 - 80
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Ames, L.L. Jr. (1959) The genesis of carbonate apatites. Economic Geology, 56, 829–841.Google Scholar
Ames, L.L. Jr. (1961) Volume relationships during replacement reactions. Economic Geology 56, 1438–1445.Google Scholar
Harlov, D.E., Wirth, R., Förster, H.J. (2005) An experimental study of dissolution-repreciptation in fluorapatite: fluid infiltration and the formation of monazite. Contributions to Mineralogy and Petrology, 150, 268–286.CrossRefGoogle Scholar
Kasioptas, A., Perdikouri, C. Putnis, C.V. and Putnis, A. (2007) The replacement of calcium carbonate by hydroxyapatite. Geochimica et Cosmochimica Ada, 71, A467.Google Scholar
Putnis, A. (2002) Mineral replacement reactions: from macroscopic observations to microscopic mechanisms. Mineralogical Magazine, 66, 689–708.CrossRefGoogle Scholar
Putnis, A. and Putnis, C.V. (2007) The mechanism of reequilibration of solids in the presence of a fluid phase. Journal of Solid State Chemistry, 180, 1738–1786.CrossRefGoogle Scholar
Putnis, A., Hinrichs, R., Putnis, C.V., Schindler, U.G. and Collins, L.G. (2007) Hematite in porous red-clouded feldspars: Evidence of large-scale crystal fluid-rock interaction. Lithos, 95, 10–18.CrossRefGoogle Scholar
Putnis, C.V., Tsukamoto, K. and Nishimura, Y. (2005) Direct observations of pseudomorphism: compositional and textural evolution at a fluid-solid interface. American Mineralogist, 90, 1909–1912.CrossRefGoogle Scholar
Putnis, C.V., Geisler, T., Beurmann, P.S., Stephan, T., Giampaolo, C. (2007) An experimental study of the replacement of leucite by analcime. American Mineralogist, 92, 19–26.CrossRefGoogle Scholar