![]() ![]() BRGM, Orléansīadoux H (1996) Le substratum des Préalpes du Chablais. Matériaux pour la Cart Géologique Suisse 113:86īadoux H (1965) Feuille et notice explicative de la Feuille Thonon–Châtel (630) de la Carte géologique de la France (1/50000ème). doi: 10.1086/381660Īrribas J, Critelli S, Le Pera E, Tortosa A (2000) Composition of modern stream sand derived from a mixture of sedimentary and metamorphic source rocks (Henares River, Central Spain). doi: 10.1016/j.sedgeo.2011.01.003Īrgnani A, Fontana D, Stefani C, Zuffa GG (2004) Late Cretaceous carbonate turbidites of the Northern Apennines: Shaking Adria at the onset of Alpine collision. Fribourg UniversityĪmorosi A, Zuffa GG (2011) Sand composition changes across key boundaries of siliciclastic and hybrid depositional sequences. doi: 10.5169/seals-165845Īmbrosetti I (2005) Étude géologique de la région de la Valsainte (Préalpes fribourgeoises). University of FribourgĪckermann A (1986) Le flysch de la nappe du Niesen. Based on the results and comparative provenance analysis with the other flyschs of the Gurnigel nappe, we propose a generic feeding model which involves the Sesia–Dent Blanche nappe, the sedimentary nappes incorporated in the accretionary prism, and probably the Briançonnais basement.Īckermann A (1984) Le Flysch de la nappe du Niesen. This provenance analysis shows that the Middle Eocene to Early Oligocene Voirons Flysch was fed by two sources, in contrast to the other flyschs of the Gurnigel nappe, and further suggests that this flysch was not deposited in the Piemont Ocean but in the Valais domain. This provenance characterises only one formation of the Voirons Flysch, and is related to the axial belt provenance. The Feldspathic petrofacies is derived from a feldspar-rich source associated with metamorphic clasts and a heavy-mineral population dominated by garnet. These observations suggest a Clastic wedge provenance. It is characterised by a mature, quartz-rich assemblage and a heavy-mineral population dominated by apatite and the zircon–tourmaline–rutile mineral group. It is similar to the sources that fed the other flyschs from the Gurnigel nappe. The Quartzose petrofacies is the most important of the two sources, and supplied three of the four formations of the Voirons Flysch. The provenance analysis is based on the Gazzi-Dickinson method and on QEMSCAN ® for heavy-minerals. They comprise a stack of sedimentary nappes related to palaeogeographic realms ranging from the Ultrahelvetic to the Southern Penninic. The Chablais Prealps (Haute-Savoie, France) represent a well-preserved accretionary wedge of the Western Alpine Tethys. ![]()
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