a: simplified geological map of the interest area and An6e sample location, compile from Goncalves et al. (2003), Rasolomanana et al. (2010), Nédelec et al. (2016) and Archibald et al. (2016). Insert showing the location of Tsaratana complex in grey. b: photomicrograph of An6e showing primary garnet and quartz and the secondary coronitic texture composed of ortho-amphibole, cordierite and biotite. (modified from Goncalves, 2002). Bt = biotite, crd = cordierite, grt = garnet, oamph = orthoamphibole, qtz = quartz.