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The evolution of the basement of southern Madagascar north and south of the Ranotsara shear zone was investigated using (U+Th)/Pb electron probe monazite age dating in combination with petrographic constraints. Several monazite grains show a stepwise progression of younger ages towards the rim indicating partial and complete resetting during tectonic, metamorphic and/or fluid events. The oldest ages,...
Gem-variety of red corundum (i.e. ruby) is produced in the Ejeda-Fotadrevo area, in southwestern Madagascar. The primary ruby deposits are closely associated with basic/ultrabasic complexes within the high grade metamorphic terranes of the Precambrian Vohibory unit. Ruby is recovered from amphibolite and anorthosite veins within these complexes. Petrographic data and P-T estimates indicate that the...
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