Fig. 16

Pre-orogenic evolution of the Briançonnais domain shown in cross-section (vertical scale strongly exaggerated in the first kilometers depth). a: Late Norian (~ 200 Ma) setting, based on (i) Ballèvre et al. (2018) from the External Crystalline massifs ECM) to Sesia, and ii) Bertotti et al. (1993) for the South Alpine domain (only western half shown). b: Kimmeridgian-Tithonian (~ 150 Ma) stage following the rifting and necking processes, based on (i) Pantet et al. (2020) for the overall aspect; (ii) Mohn et al., (2010, 2012) for mantle and cover features, and iii) this work for the width and thickness of the Briançonnais crust and location of the Briançonnais s.l. units of the Cottian transect. c Late Cretaceous extensional event (~ 80 Ma). Local cross-section: restoration of the tectonic-sedimentary setting allowing the Longet-Alpet Breccia to emplace onto the Acceglio s.l. units. Two tentative interpretations of the regional extension are shown below; the second interpretation (sketch 2) is favored in this work