Geometry and kinematics of early Alpine nappes in a Briançonnais basement (Ambin Massif,Western Alps) |
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| Authors: | Jérôme Ganne Jean-Michel Bertrand Serge Fudral |
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| Institution: | 1. Australian Crustal Research Centre, School of Geosciences, Monash University, PO Box 28E, Melbourne, Victoria 3800, Australia;2. Laboratoire de géodynamique des chaînes alpines, CNRS UMR 5025, université de Savoie, 73376 Le Bourget-du-Lac cedex, France;3. EDYTEM, CNRS, université de Savoie, domaine universitaire, 73376 Le Bourget-du-Lac cedex, France |
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| Abstract: | Petrological and structural observations from the Ambin pre-alpine basement dome and from its Briançonnais and Piedmont covers show an early D1 nappe-forming event overprinted by a major D2 (+?D3) ductile shearing deformation. The D1 event is characterised by garnet-blueschist facies metamorphic assemblages retrogressed to greenschist facies conditions during D2 then D3 stages near the top of the dome. North-verging D1 structures preserved in the core of the dome are consistent with alpine evolutionary models, in which exhumation of HP–LT metamorphic alpine rocks occurs initially in a north–south direction. To cite this article: J. Ganne et al., C. R. Geoscience 336 (2004). |
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| Keywords: | HP metamorphism exhumation Penninic domain Alps métamorphisme de HP exhumation domaine pennique Alpes |
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