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

Authors: Perdikouri, C.; Kasioptas, A.; Putnis, C.V.; Putnis, A.

Source: Mineralogical Magazine, Volume 72, Number 1, February 2008 , pp. 111-114(4)

Publisher: Mineralogical Society

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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

Document Type: Research article

DOI: 10.1180/minmag.2008.072.1.111

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