Timun-Gneiskomplex

Représentation et statut

Variantes historiques: Timunmasse (Wilhelm 1929, 1933), Timun-Stellamasse (Zurflüh 1961), Timun complex (Milnes & Schmutz 1978), Complesso Stella-Timun (Sciesa 1991), gneiss de Timun (Mayerat Demarne 1994 p.19)

Unités hiérarchiquement subordonnées

Termes génériques

Type de protolithe

Métamorphisme

polycyclique

Faciès métamorphique

Révision: Milnes Alan G., Schmutz Hans-Ulrich (1978) : Structure and history of the Suretta nappe (Pennine zone, Central Alps): a field study. Eclogae geol. Helv. 17/1, 19-33

p.22: Again, parts of this extremely heterogeneous rock complex have been described petrographically in great detail (Zurflüh 1961, Blanc 1965). It is thought to be the country rock into which the Roffna granite-porphyry was originally intruded (see Zurflüh 1961). The complex consists mainly of chlorite-sericite schists and schistose gneisses, with discontinuous augen gneiss and amphibolite intercalations, as well as grey gneiss horizons, very similar to Roffna gneiss, and some more exotic rock types (e.g. the «eclogite» of Val di Lei. Staub 1926, Schärer 1974). In parts of the area, for reasons given below, the contact between the Timun complex and the Roffna gneiss cannot be defined unambiguously. Although the Alpine metamorphism was low grade over the whole area, and most rocks are completely retrograded, remnants of the original, probably Caledonian, amphibolite facies metamorphism of this basement complex have been described recently (Wenk 1974).