Porosity generated during the fluid-mediated replacement of calcite by fluorite

E. T. Pedrosa; C. V. Putnis; F. Renard; A. Burgos-Cara; B. Laurich; A. Putnis

doi:10.1039/C6CE01150K

Porosity generated during the fluid-mediated replacement of calcite by fluorite†

E. T. Pedrosa,

*^a C. V. Putnis,^ab F. Renard,^cde A. Burgos-Cara,^af B. Laurich^g and A. Putnis^ab

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* Corresponding authors

^a Institute of Mineralogy, University of Münster, Corrensstrasse 24, 48149 Münster, Germany
E-mail: e.trindade.pedrosa@uni-muenster.de

^b The Institute for Geoscience Research (TIGeR), Curtin University, 6845 Perth, Australia

^c Univ. Grenoble Alpes, ISTerre, CS 40700, Grenoble cedex 9, France

^d CNRS, ISTerre, CS 40700, Grenoble cedex 9, France

^e Department of Geosciences, Physics of Geological Processes, University of Oslo, Norway

^f Department of Mineralogy and Petrology, University of Granada, Fuentenueva s/n, 18002 Granada, Spain

^g Structural Geology, Tectonics and Geomechanics, RWTH Aachen University, Lochnerstrasse 4-20, 52056 Aachen, Germany

Abstract

Mineral replacement reactions are common phenomena in natural and laboratory environments where solids have re-equilibrated with aqueous solutions and are characterized by the generation or destruction of porosity in the product phase(s). Here, the evolution of porosity during the replacement of calcite by fluorite is used as a model system to characterize the kinetics of volume variations. Non-porous single crystals of calcite were reacted with sodium fluoride solutions for different reaction times. The crystals were pseudomorphically replaced by highly porous fluorite. Complementary use of porosimetry techniques, high resolution imaging, and mass-balance calculations revealed the total, open, and closed porosity in the samples. The infiltration of aqueous fluids in the Earth depends on the evolution of porosity and hence porosity variations are important in various geological processes such as, rock weathering and soil formation, fluid-controlled metamorphism, mineral ore emplacement, or oil and gas reservoir compaction. Such mechanisms can also be used to develop geo-inspired materials designed for industrial and medical applications.

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DOI: https://doi.org/10.1039/C6CE01150K
Article type: Paper
Submitted: 17 May 2016
Accepted: 08 Aug 2016
First published: 08 Aug 2016

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CrystEngComm, 2016,18, 6867-6874

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Porosity generated during the fluid-mediated replacement of calcite by fluorite

E. T. Pedrosa, C. V. Putnis, F. Renard, A. Burgos-Cara, B. Laurich and A. Putnis, CrystEngComm, 2016, 18, 6867 DOI: 10.1039/C6CE01150K

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Porosity generated during the fluid-mediated replacement of calcite by fluorite†

Abstract

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Porosity generated during the fluid-mediated replacement of calcite by fluorite

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