Fig. 6From: Metamorphic gabbro and basalt in ophiolitic and continental nappes of the Zermatt region (Western Alps)Photomicrographs of Matterhorn gabbro. a) Olivine and augite (Cpx) gabbro with unaltered plagioclase. Thin Opx reaction rims along grain boundaries; b) Augite and plagioclase in typical Matterhorn gabbro (KB1381). Pl is strongly altered to saussurite (Ab + Clz), Cpx altered to Chl + Amp by low-temperature reaction with aqueous fluids that migrated along veins (e.g. red dashed line)Back to article page