Abstract
Understanding the mechanism and kinetics of the replacement of carbonates by fluorite has applications in Earth sciences and engineering. Samples of Carrara marble were reacted with an ammonium fluoride (NH4F) solution for different reaction times and temperatures. The microstructure of the product phase (fluorite) was analyzed using SEM. The kinetics of replacement was monitored using Rietveld refinements of X-ray powder diffraction patterns of the products. After reaction, all samples preserved their size and external morphology (a pseudomorphic replacement). The grain boundaries of the original marble were preserved although each calcite grain was replaced by multiple fine crystals of fluorite creating inter-crystal porosity. The empirical activation energy Ea (kJ/mol) of the replacement reaction was determined by both model-fitting and model-free methods. The isoconversional method yielded an empirical activation energy of 41 kJ/mol, and a statistical approach applied to the model-fitting method revealed that the replacement of Carrara marble by fluorite is better fitted to a diffusion-controlled process. These results suggest that the replacement reaction depends on the ion diffusion rate in the fluid phase through the newly formed porosity.
Acknowledgments
This project has received funding from the European Union’s Seventh Framework Program for research, technological development and demonstration, a Marie Curie initial training network (Flowtrans) under grant agreement number 316889. Andrew Putnis and Christine V. Putnis also acknowledge funding within the EU Initial Training Networks CO2-React and MINSC.
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- Highlights and Breakthroughs
- Periodic activity in continental magmatic arcs
- Highlights and Breakthroughs
- Early warning signs for mining accidents: Detecting crackling noise
- Review
- Fluids and trace element transport in subduction zones
- Solved: The enigma of labradorite feldspar with incommensurately modulated structure
- Solved: The enigma of labradorite feldspar with incommensurately modulated structure
- Special Collection: Earth Analogs for Martian Geological Materials and Processes
- Formation of the ferruginous smectite SWa-1 by alteration of soil clays
- Special Collection: Advances in Ultrahigh-Pressure Metamorphism
- Dissolving dolomite in a stable UHP mineral assemblage: Evidence from Cal-Dol marbles of the Dora-Maira Massif (Italian Western Alps)
- Special collection: Apatite: a common mineral, uncommonly versatile
- Hydroxyl, Cl, and F partitioning between high-silica rhyolitic melts-apatite-fluid(s) at 50–200 MPa and 700–1000 °C
- Special collection: Apatite: a common mineral, uncommonly versatile
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- Special collection: Apatite: a common mineral, uncommonly versatile
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