Fig. 4

Field aspects of the Aiguilles Rouges Gabbro. Photographs captured below the Glacier Supérieur des Aiguilles Rouges (a–e), at Les Ignes (f, g) and on the eastern slopes of the Aiguilles Rouges peaks (h). a Undeformed mesocratic gabbro displaying a magmatic phaneritic texture composed of a matrix of metamorphosed plagioclase and clinopyroxene grains bordered by black interstitial amphibole. b Undeformed mesocratic gabbro cut by a horblende-bearing felsic dikelet. c Diabase dikes crosscutting the undeformed Aiguilles Rouges gabbro. d Plagiogranite dikes intruding the Aiguilles Rouges gabbro and exhibiting syn-magmatic deformation. e Diabase and hornblende-bearing felsic dikelets intruding gabbro. f Undeformed mesocratic gabbro exhibiting magmatic heterogeneities and grain-size variations and crosscut a by diabase with a preserved microgabbroic texture. g Metagabbro exhibiting high-temperature ductile deformation, marked by the alignment of metamorphosed pyroxene and hornblende. h Metagabbro overprinted by Alpine mylonitic deformation