Alkaline Rocks and Carbonatites of the World

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Occurrence number: 
Longitude: 43.63, Latitude: -22.4

A plug 5 km in diametre located just west of Betsioky (Besairie, 1969b) consists of basanite and tephrite (Nicollet, 1984), which is confirmed by a rock analysis, referred to as limburgite, in Lacroix (1923). A smaller plug is located some 10 km to the south-southwest which is likely to be of a similar composition.

BESAIRIE, H. 1969b. Carte Géologique. Feuille 6. Morondava. 1:500,000. Service Géologique de Madagasikara, Tananarive.LACROIX, A. 1923. Minéralogie de Madagascar. 3. Lithologie Appendice - Index Geographique. Société d’Éditions Géographiques, Maritimes et Coloniales, Paris. 450 pp.NICOLLET, C. 1984. Le volcanisme dans le Sud-Ouest Madagascar. Journal of African Earth Sciences, 2: 383-8.
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith