Table 2 Schematic relationships between deformation and metamorphism (a) Basement rocks (Arolla Series and Lower Unit), (b) Becca di Salé and Cuney slices c Roisan Zone
Stage | Granite (coronitic fabrics) | Quartzdiorite (coronitic fabrics) | Ph ± sodic Amp-bearing gneiss (tectonitic and mylonitic fabrics) | Amp ± Grt-bearing gneiss (tectonitic and mylonitic fabrics) | |
|---|---|---|---|---|---|
(a) AROLLA UNIT | |||||
1 pre-Alpine | Mag1 | Qz + Pl + Afs + Bt + Amp | Pl + Qz + Bt + Hbl | – | Qz + Fsp + Hbl + Ttn + Ap |
2 pre-Alpine | D2 + Met2 | Wm + Chl ± Ilm ± Ttn | Wm + Chl ± Ilm ± Ttn | – | – |
3 Alpine | D3 + Met3 | – | – | Qz + Fsp + Ph + sodic Amp + Ep + Ilm | Qz + Fsp + Grt + blue or green Amp + Ep + Ph + Ttn |
4 Alpine | D4 + Met4 | – | – | Qz + Fsp + Ph + sodic Amp + Ep + Ilm | Qz + Fsp + Grt + blue or green Amp + Ep + Ph + Ttn |
5 Alpine | D5 + Met5 | Ep + Chl + Wm | Ep + Chl + Wm | Wm + Chl ± Cal ± green Amp | Wm + Chl ± Cal ± green Amp |
6 Alpine | D6 ± Met6 | Cal | Cal | Cal + Chl | Cal + Chl |
Stage | Impure marble | Metasediments | |||
|---|---|---|---|---|---|
(b) CUNEY and BECCA DI SALE’ SLICES | |||||
1 pre-Alpine | Metl | Cal + Qz + Grt + Di + Ttn + Aln | Qz + Grt + Mn-Cum + Mag + Aln + Ap | ||
2 pre-Alpine | D2 + Met2 | – | – | ||
3 Alpine | D3 + Met3 | Cal + blue-green Amp + Grt + Qz + Ph + Ep + Pl + Ilm | Qz + Grt + sodic Amp + Mag + Ilm | ||
4 Alpine | D4 + Met4 | Cal + blue-green Amp + Grt + Qz + Ph + Ep + Pl + Ilm | Qz + Grt + sodic Amp + Mag + Ilm | ||
5 Alpine | D5 + Met5 | – | Stp + Chl + Py + green Amp + Hem | ||
6 Alpine | D6 ± Met6 | Cal | Hem + Chl | ||
Stage | Dolomitic marble | Calcschist (tectonitic and mylonitic fabrics) | Qz-bearing micaschist (tectonitic and mylonitic fabrics) | ||
|---|---|---|---|---|---|
(c) ROISAN ZONE | |||||
1 pre-Alpine | Mag1 | – | – | – | |
2 pre-Alpine | D2 + Met2 | – | – | – | |
3 Alpine | D3 + Met3 | Dol + Wm + Qz + Cal + Pl + Py | Cal + Qz + Ph + Ank + Gr + Pl + Ep + Ttn | Wm + Qz + Cal + Gr + Ank + Pl | |
4 Alpine | D4 + Met4 | Dol + Wm + Qz + Cal + Pl + Py | Cal + Qz + Ph + Ank + Gr + Pl + Ep + Ttn | Wm + Qt + Cal + Gr + Ank + Pl | |
5 Alpine | D5 + Met5 | – | Wm + Chl ± Cal | Wm + Chl + Py ± Cal | |
6 Alpine | D6 ± Met6 | Cal + Qz | – | Chi + Qz | |