Âge des orthogneiss de la zone axiale de la Montagne Noire (France) par la méthode 87Rb-87Sr |
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| Authors: | J Hamet C J Allègre |
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| Institution: | (1) Groupe de Recherches Géochimiques Louis Barrabé, Institut de Physique du Globe, Paris, France |
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| Abstract: | The basement of Montagne Noire (South France), as represented by the orthogneisses of the axial zone, has been dated by means of whole rocks isochron at 530 m.y. This age is discussed with the assistance of petrographic observations and compared to similar results obtained by other authors in the Massif Armoricain and eastern Pyrénées ranges. The high initial ratio 87Sr/86Sr allows one to hypothesize that these igneous masses were originated from a segment of a preexisting crust.
Contribution I.P.G.N.S. No 8. |
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