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Swiss Journal of Geosciences
Fig. 8 | Swiss Journal of Geosciences

Fig. 8

From: Fossil oceanic core complexes in the Alps. New field, geochemical and isotopic constraints from the Tethyan Aiguilles Rouges Ophiolite (Val d’Hérens, Western Alps, Switzerland)

Fig. 8

Main field aspects of the basement-cover contact in the Mont de l’Etoile area. a Serpentinite cataclasite, intruded by a diabase at Log 1. Mantle rocks are overlain by a thin layer of metabasalt and calcschist. b Tectono-sedimentary breccia at Log 2 (overlying foliated serpentinite). The clasts of serpentinite are angular and still displaying the primary texture of mantle rocks. They are supported by a chlorite-rich matrix and show partial carbonatization. c Basement-cover sequence at Log 4. Serpentinite is transformed into a talcschist at the basement-cover interface. It is stratigraphically overlain by a chlorite- and plagioclase-rich layer of laterally variable thickness. The latter are sealed by a tectono-sedimentary breccia, including clasts of serpentinite within a carbonate-rich matrix. d Foliated and carbonatized serpentinite at Log 5

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