Table 3 Compilation of isotopic age dates of rock units in the Aiguilles Rouges and Mont Blanc massifs
Zircon bearing unit* | Zircon age (Ma) | References |
|---|---|---|
Igneous units | ||
Aiguilles Rouges massif | ||
Salvan-Dorenzaz basin | Capuzzo and Bussy (2000) | |
Tuffs | 295 +3/-4 | |
Dorénaz dacite volcanic | 308 ± 3 | |
Rhyolitic dike | 311 ± 17 | |
Morcles microgranite | 303 ± 2 | Grosjean et al. (2018) |
309–312 | ||
Vallorcine granite | 306.5 ± 1.5 | Bussy et al. (2000) |
Fully gabbros | 307 ± 2 | |
Porménaz granite | 332 ± 2 | |
Montées Pélissiers granite | 331 ± 2 | |
Mont Blanc massif | ||
Mont Blanc granite | 303 ± 2 | Bussy et al. (2000) |
Montenvers granite | 307 ± 3 | |
Mont Blanc rhyolite | 307 ± 2 | Capuzzo and Bussy (2000) |
Lognan granite | 453 ± 3 | Bussy and von Raumer (1994) |
Polymetamorphic basement | ||
Aiguilles Rouges massif | ||
Emosson leucosome | 320 ± 1* | Bussy et al. (2000) |
Emosson micaschists | 327 ± 2* | |
Garnet gneisses | ~300–330* | Schulz and von Raumer (2011) |
Mylonitic garnet gneisses | ~440* | |
Eclogite | 453 +3/− 2 | Paquette et al. (1989) |
Lake Cornu augengneiss | 455 +3/− 4 | Bussy et al. (2011) |
Mt Lusin orthogneiss | 455.3 ± 0.6 | |
Eclogitic amphibolite | 458 ± 5 | |
Val Bérard orthogneiss | 461 +3.5/− 4.5 | |
Banded eclogite | 463 +3/− 2 | |
Val Bérard augengneiss | 464 +5/− 3 |