Emeralds was first reported found in this area in the beginning of the 1960s. Emeralds colored by vanadium instead of chromium. The emerald mineralisation occurs in phlogopite in contact between pegmatite and basic/ultrabasic rocks. The emeralds were formed cause to metasomatic processes related to the Pan-African tectonometamorphic event. The area has been divided by Cheilletz et al. in 2 zones: A north zone and a south zone.
References
- Grundmann, G. (2001): Die Smaragde der Welt. ExtraLapis 21: 26-37 [german version]
- A. Cheilletz et al.: OS06 : TUpm30 : G5 : Emerald Deposits in Madagascar: Two Differents Types for one Mineralising Event:EUG XI.Symposium OS06 Mineralogy, Ore Geology and Mineral Resources.; see http://www.the-conference.com/JConfAbs/6/OS06.pdf
- Moine, B. et al. (2004): Comptes Rendus Geosciences 336, 513-522. (in French)
- Groat, L.A., Giuliani, G., Marshall, D.D., and Turner, D. (2008): Emerald deposits and occurrences: A review. Ore Geology Reviews 34, 87-112.
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