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The massif of anorthosite (black on the drawing) is 10 km in diameter. It is wrapped by a NNE-SSW vertical foliation S2, like a giant porphyroclast. East of the massif, a early foliation S1 is preserved and folded in a megalithon. PhotoID316

The massif of anorthosite (black on the drawing) is 10 km in diameter. It is wrapped by a NNE-SSW vertical foliation S2, like a giant porphyroclast. East of the massif, a early foliation S1 is preserved and folded in a megalithon. PhotoID316

Photograph: j.e.martelat & c.nicollet

Reference: Martelat, J. E., Nicollet, C., Lardeaux, J. M., Vidal, G., Rakotondrazafy, R. (1997) – Lithospheric tectonic structures developed under High-grade metamorphism in the southern part of Madagascar. Geodinamica Acta, 10, 94-114.