Université de Fribourg

The formation of Pangea

Stampfli, G.M. ; Hochard, C. ; Vérard, C. ; Wilhem, C. ; Raumer, Jürgen F. von

In: Tectonophysics, 2013, vol. 593, p. 1-19

The making of Pangea is the result of large-scale amalgamation of continents and micro-continents, which started at the end of the Neoproterozoic with the formation of Gondwana. As pieces were added to Gondwana on its South-American, Antarctica and Australia side, ribbon-like micro-continents were detached from its African and South-Chinese side: Cadomia in the late Neoproterozoic, Avalonia...

Université de Fribourg

Discovery of Ordovician–Silurian metamorphic monazite in garnet metapelites of the Alpine External Aiguilles Rouges Massif

Schulz, Bernhard ; Raumer, Jürgen F. von

In: Swiss Journal of Geosciences, 2011, vol. 104, no. 1, p. 67-79

The pre-Mesozoic, mainly Variscan metamorphic basement of the Col de Bérard area (Aiguilles Rouges Massif, External domain) consists of paragneisses and micaschists together with various orthogneisses and metabasites. Monazite in metapelites was analysed by the electron microprobe (EMPA-CHIME) age dating method. The monazites in garnet micaschists are dominantly of Variscan age (330–300 Ma)....

Université de Fribourg

Gondwana-derived microcontinents — the constituents of the Variscan and Alpine collisional orogens

Raumer, Jürgen F. von ; Stampfli, Gérard M. ; Borel, Gilles D. ; Bussy, François

In: Tectonophysics, 2003, vol. 365, p. 7

The European Variscan and Alpine mountain chains are collisional orogens, and are built up of pre-Variscan "building blocks" which, in most cases, originated at the Gondwana margin. Such pre-Variscan elements were part of a pre-Ordovician archipelago-like continental ribbon in the former eastern prolongation of Avalonia, and their present-day distribution resulted from juxtaposition through...