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Swiss Journal of Geosciences
Fig. 5 | Swiss Journal of Geosciences

Fig. 5

From: Eclogitic metamorphism in the Alpine far-west: petrological constraints on the Banchetta-Rognosa tectonic unit (Val Troncea, Western Alps)

Fig. 5

Representative microstructures of the Monte Banchetta continental succession. (a, b, c) metabasite body. a Garnet porphyroblasts partially retrogressed to chlorite and wrapped by S1 foliation, defined by glaucophane + epidote + quartz, partially retrogressed to poikiloblastic albite (Plane Polarized Light, PPL); b Garnet porphyroblasts displaying an outer Mn-rich Alpine rim and an inner Ca + Fe-rich, likely pre-Alpine core (Back Scattered Electron image, BSE); c Detail on a sub-mm patch made of relict K-feldspar + epidote + chlorite + white mica (BSE). (d, e, f) Tlc + Aeg-bearing impure marble; d S1 hematite foliation transposed by S2 schistosity (BSE); e Calcitic matrix with relict crystals of dolomite + hematite and talc flakes oriented along the S1 foliation (BSE); f Large chromite crystals wrapped by chlorite, growing also along micro-fractures. Note aegirine partially retrogressed by Ca-amphiboles and talc flakes dispersed in the calcitic matrix (BSE)

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