Variabilité des caractères spilitiques et magmatiques du volcanisme alcalin triasique du massif des Ecrins-Pelvoux (Alpes françaises) : utilisation originale de projections géochimiques sélectives préalables à l'analyse en composantes principales

Abstract : The spilitic volcanic rocks of the Ecrins-Pelvoux area comprise subaerial lava flows and a swarm of dykes which crosscut the cristalline pre-Triassic basement. Most flows are interbedded with the upper Triassic dolomites of the pre--rift platform, but occasional flows are interbedded with limestone or shale of the Tethyan rifted margin. Doleritic texture has been observed in many dykes and thicker lava flows. The effusive rocks are commonly microlithic and almost completely replaced by a low temperature assemblage of chlorite, albite (or K-feldspar). and carbonate. The dykes are generally less altered ; but the margins and offshoots are strongly recrystallized and are sometimes brecciated containing the low temperature carbonate-rich product as a fracture filling.. Nevertheless, despite the general alteration, a relict basaltic mineralogy is found in the dykes, as weIl as in the lava flows.
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Géochimie. Université Joseph-Fourier - Grenoble I, 1981. Français
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Georges Buffet Croix Blanche. Variabilité des caractères spilitiques et magmatiques du volcanisme alcalin triasique du massif des Ecrins-Pelvoux (Alpes françaises) : utilisation originale de projections géochimiques sélectives préalables à l'analyse en composantes principales. Géochimie. Université Joseph-Fourier - Grenoble I, 1981. Français. 〈tel-00654178〉

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