Rôle du fluor dans la formation des gisements d'émeraude de Mananjary (Est de Madagascar) |
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| Authors: | Bernard Moine Christian Chan Peng Alain Mercier |
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| Institution: | Laboratoire de minéralogie, UMR 5563, CNRS/université Paul-Sabatier, 39, allées Jules-Guesde, 31000 Toulouse, France |
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| Abstract: | The Mananjary emerald deposits are hosted in phlogopite-rich rocks formed through metasomatic alteration of meta-ultrabasites (hornblendites) at about 500 °C and 2 kbar due to infiltration of fluoride-rich fluids. A thermodynamic model explains the role of fluoride-complexation in the transport of Be and points to co-precipitation of F-phlogopite as the cause of beryl deposition. To cite this article: B. Moine et al., C. R. Geoscience 336 (2004). |
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| Keywords: | gisements d'émeraude métasomatose fluor modélisation Madagascar emerald deposits metasomatism fluorine modelling Madagascar |
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