Gem Corundum Deposits of Madagascar: a Review
Ore Geology Reviews 34 (2008) 134–154 Contents lists available at ScienceDirect Ore Geology Reviews journal homepage: www.elsevier.com/locate/oregeorev Gem corundum deposits of Madagascar: A review Amos Fety Michel Rakotondrazafy a, Gaston Giuliani b,c,⁎, Daniel Ohnenstetter c, Anthony E. Fallick d, Saholy Rakotosamizanany a, Alfred Andriamamonjy a, Théogène Ralantoarison a, Madison Razanatseheno a, Yohann Offant e, Virginie Garnier b, Henri Maluski f, Christian Dunaigre g, Dietmar Schwarz g, Voahangy Ratrimo a a Faculté des Sciences, Département des Sciences de La Terre, Université d'Antananarivo, Ambohitsaina, BP 906, Antananarivo 101, Madagascar b Institut de Recherche pour le Développement, DME, UR154 LMTG, Toulouse, France c Centre de Recherches Pétrographiques et Géochimiques/Centre National de la Recherche Scientifique, BP 20, 54501- Vandœuvre-lès-Nancy, France d Scottish Universities Environmental Research Centre, East Kilbride, Rankine Avenue, Glasgow G75 0QF, Scotland, UK e Cerege, Europole Méditerranéen de l'Arbois, BP 80, 13545- Aix-en-Provence, France f Laboratoire de Géochronologie, Université de Montpellier 2, Place Eugène Bataillon, 34095 Montpellier, France g Gübelin Gemmological Laboratory, Maihofstrasse, 102, CH-6000 Lucerne 9, Switzerland ARTICLE INFO ABSTRACT Article history: Madagascar is one of the most important gem-producing countries in the world, including ruby and Received 2 March 2006 sapphires. Gem corundum deposits formed at different stages in the geological evolution of the island and in Accepted 24 May 2007 contrasting environments. Four main settings are identified: (1) Gem corundum formed in the Precambrian Available online 18 April 2008 basement within the Neoproterozoic terranes of southern Madagascar, and in the volcano-sedimentary series of Beforona, north of Antananarivo.
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