Spät- bis postvariszische Intrusiva des Err-Deckenkomplexes

Rappresentazione e statuto

Deutsch: Spät- bis postvariszische Intrusiva des Err-Deckenkomplexes
Français: roches plutoniques tardi- à postvarisques du Complexe de nappes d'Err

Varianti storiche: --- (Cornelius 1935), late syn- to post-Variscan intrusive rocks (Manatschal 1995)

Unità di rango inferiore

Geomorfologia

Età alla base

Revisione: Manatschal Gianreto, Nievergelt Peter (1997) : A continent-ocean transition recorded in the Err and Platta nappes (Eastern Switzerland). Eclogae geol. Helv. 90/1, 3-27

p.7: The Err basement lacks the alkaline suite and the alkaline extrusive rocks found in the Julier-Bernina basement (Spillmann & Büchi 1993). but contains calc-alkaline rocks (granophyre) which are missing in the Bernina basement (Cornelius 1935). This different distribution of rock types in the Err and Bernina basement allows one to distinguish between a source area located in the Bernina domain and another one located in the Err domain for some of the crystalline-bearing Mesozoic sedimentary breccias. Within the Err basement, the Albula Granite is the most common rock type. It is never stratigraphically overlain by Permo-Triassic sediments and all observed contacts between Albula Granite and Permo-Triassic sediments are tectonic, suggesting that the Albula Granite was probably exhumed after the deposition of the latter sediments during rifting. This is also supported by the lack of clast of Albula Granite in the lowermost crystalline bearing Jurassic sedimentary breccias in the Err nappe (Cornelius 1935. Finger 1978).