Table 2 Compilation of previous U–Pb geochronology
Intrusion | Age | U–Pb Method | Reference |
|---|---|---|---|
Group A/Rötifirn group | |||
Punteglias and Giuv intrusions | 334 ± 2.5 Ma 335.479 ± 0.041/ 0.097/0.37 Ma | Minifractions*, untreated; upper intercept age Single grains, PA and CA | Schaltegger & Corfu (1992) Gaynor, Ruiz, et al. (2022) |
Baltschieder granodiorite | 336.2 ± 1.7 Ma | Fractions, CA; upper intercept age | Hettmann et al. (2009) |
Tödi granite | 333 ± 2 Ma | Minifractions, PA | Schaltegger & Corfu (1995) |
Group B/Fruttstock group | |||
Schöllenen syenite | 316 ± 27 Ma | Multigrain**, untreated; upper intercept age | Schaltegger & von Quadt (1990) |
Düssi diorite | 308 ± 2 Ma | Minifractions, PA | Schaltegger & Corfu (1992) |
Schöllenen syenite | 310 ± 3 Ma | Minifractions, PA | Schaltegger & Corfu (1992) |
Voralp granite | 309 ± 2 Ma | Minifractions, PA | Schaltegger & Corfu (1992) |
Group C/Haslital group | |||
Central Aar + Mittagflue granites, Grimsel | 298 ± 6 Ma | Multigrain, unabraded; upper intercept age | Schaltegger & von Quadt (1990) |
Central Aar granites, Reuss valley | 296 ± 3 Ma | Multigrain, unabraded; upper intercept age | Schaltegger & von Quadt (1990) |
Grimsel granodiorite | 299 ± 2 Ma | Minifractions, PA | Schaltegger & Corfu (1992) |
Mittagflue granite | 296.5 ± 2.5 Ma | Minifractions, PA | Schaltegger & Corfu (1992) |
Central Aar granites, Reuss valley | 297 ± 2 Ma | Minifractions, PA | Schaltegger & Corfu (1992) |
Gastern granite | 303 ± 4 Ma | Minifractions, PA | Schaltegger (1993) |
Gastern granite | ~ 300 Ma | Multigrain***, CA | Hettmann et al. (2009) |
Bietschhorn granite | 289 ± 3 Ma | Multigrain***, CA; upper intercept age | Hettmann et al. (2009) |