Radiometric evidence for an Acadian tectonometamorphic event in Western Massif Central Français |
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| Authors: | Jean Bernard-Griffiths Jean-Marie Cantagrel Jean-Louis Duthou |
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| Institution: | (1) Laboratoire Associé No 10, C.N.R.S. et Université Chronologie des Terrains Cristallins et Volcanologie, 5, rue Kessler, Clermont-Ferrand, France |
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| Abstract: | Systematic Rb-Sr determinations on granites and orthogneisses in the Western part of Massif Central Français (Limousin) permit us to say that metamorphism and associated folding occured in this area during the Devonian (between 400 and 350 m.y.) with anatexis stated at 360 m.y. Two premetamorphic magmatic episodes are located in the upper Cambrian-early Ordovician (520-490 m.y.) and in the Ordovician (460-450 m.y.). This should be compared with very similar radiometric results from Rouergue to South Brittany; thus a South Brittany-Limousin-Rouergue axis may be easily related to the acadian part from Appalachian belt. |
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