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American Mineralogist; July 2003; v. 88; no. 7; p. 978-985
© 2003 Mineralogical Society of America
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Dissolution of strontianite at high P-T conditions: An in-situ synchrotron X-ray fluorescence study

Carmen Sanchez-Valle1,*, Isabelle Martinez2, Isabelle Daniel1, Pascal Philippot3, Sylvain Bohic4 and Alexandre Simionovici4

1 Laboratoire de Sciences de la Terre, UMR 5570 CNRS-ENS Lyon-UCB Lyon 1, 46, Allée d’Italie, F-69364 Lyon Cedex 07, France
2 Laboratoire de Géochimie des Isotopes Stables, Tour 54-64, IPGP Paris VII 2, place Jussieu, 75251 Paris Cedex 05, France
3 Laboratoire de Geosciences Marines, CNRS-IPGP, case 89, Paris VI-VII 4, place Jussieu, 75005 Paris, France
4 ID22, European Synchrotron Radiaction Facility 6, rue Jules Horowitz, BP 220, F-38043 Grenoble Cedex, France

Correspondence: * E-mail: Carmen.Sanchez{at}ens-lyon.fr

In-situ measurements of the amount of dissolution of carbonate minerals at high pressures (up to 3.6 GPa) and temperatures (up to 523 K) are reported. Using an externally heated diamond anvil cell (DAC) and synchrotron X-ray fluorescence (SXRF), the extent of dissolution of strontianite (SrCO3) has been followed as a function of time by monitoring the fluorescence of Sr cations in the fluid surrounding the crystal. This work demonstrates that Sr2+ concentrations as low as 1000 ppm can be detected and measured in-situ in a DAC, using a forward transmission geometry. The preliminary data presented here indicate that this technique has high potential for determining solution composition in high-pressure and high-temperature geochemical studies.




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