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Mineralogical Magazine; February 2008; v. 72; no. 1; p. 111-114; DOI: 10.1180/minmag.2008.072.1.111
© 2008 Mineralogical Society of Great Britain and Ireland
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Session I: Mineral weathering

The effect of fluid composition on the mechanism of the aragonite to calcite transition

C. Perdikouri*, A. Kasioptas, C. V. Putnis and A. Putnis

Institute of Mineralogy, University of Muenster, Corrensstrasse 24, D-48149, Germany

* E-mail: cperd_01{at}uni-muenster.de

ABSTRACT

Experiments were performed to investigate the transformation of natural aragonite crystals to calcite by reaction with aqueous solutions of calcium carbonate at hydrothermal conditions for different periods of time. X-ray powder diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy and Laser ablation inductively coupled mass spectrometry (LA-ICP-MS) were used to characterize the reaction product. The results indicate that the replacement of aragonite by calcite follows an interface-coupled dissolution-precipitation mechanism.

KEYWORDS: aragonite, calcite, replacement, interface






JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
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