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- W1990338875 abstract "One diorite sheet, syntectonic with the dominant D2 foliation in the Guilleries massif, 50 km south of the Variscan Pyrenean axial zone, has provided an U–Pb age of 323.6 ± 2.8 Ma, one of the oldest in that part of the Variscan basement. This age seems to be the same as that of the sillimanite-grade syn-D2 metamorphism in the deepest part of the massif; it is clearly separated from that obtained in three syn-extensional D3 leucogranite veins (305.3 ± 1.9; 301.5 ± 1.7; 299.0 ± 2.3 Ma) and the coeval biotite granites (305.9 ± 1.5 Ma). The leucogranites are 20 Ma younger than the syn-D2 diorite and the sillimanite-grade metamorphism. They are considered the melting-induced products in the host rocks, at a deeper level than that of the present outcropping of the mantle-related biotite granites during the extensional collapse (D3) of the chain in the Lower Stephanian. La datation U–Pb d’une intrusion laminaire dioritique syntectonique de la foliation dominante D2 (qu’elle soit d’origine compressive ou extensive), dans le massif des Guilleries, situé 50 km au sud de la zone axiale varisque pyrénéenne, indique un âge de cristallisation de 323,6 ± 2,8 Ma, un des plus anciens obtenu dans cette région du socle varisque. Cet âge doit correspondre à l’âge du métamorphisme à sillimanite syn-D2 dans les parties profondes du massif ; il est nettement distinct des âges obtenus sur trois veines de leucogranite syn-extension D3 (305,3 ± 1,9 ; 301,5 ± 1,7 ; 299,0 ± 2,3 Ma) et un granite à biotite contemporain (305,9 ± 1,5 Ma). Ces leucogranites postdatent de 20 Ma la diorite syn-D2 et le métamorphisme à sillimanite. Ils sont considérés comme étant les produits de fusion de l’encaissant, induits par la mise en place en profondeur des granites à biotite d’influence mantellique au cours de l’extension (D3), par effondrement gravitaire de la chaîne au Stéphanien inférieur." @default.
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- W1990338875 date "2008-04-01" @default.
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- W1990338875 title "U–Pb Shrimp-RG zircon ages of Variscan igneous rocks from the Guilleries massif (NE Iberia pre-Mesozoic basement). Geological implications" @default.
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- W1990338875 doi "https://doi.org/10.1016/j.crte.2007.12.006" @default.
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