Fig. 7From: Metamorphic gabbro and basalt in ophiolitic and continental nappes of the Zermatt region (Western Alps)Total alkalis vs. silica diagram (TAS diagram) for a metamorphic basalt (eclogite) and b meta-gabbro from the Zermatt region. Definition of fields from Le Maitre et al. (2002) and Le Bas et al. (1986). Alkalic-Subalkalic boundary after Irvine and Baragar (1971). Yellow point = Global MORB (Arevalo & McDonough, 2010)Back to article page