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Polyphasage du dynamisme éruptif dans le rift du Velay : l'exemple du volcan de Bournac (massif du M

DOCUMENT
Catgorie : REVUES ET PERIODIQUES

(Paris)
COLLECTION : Comptes-rendus de l'Académie des Sciences
Rf. diteur : Gauthier-Villars, Paris

ILLUSTRE
ISSN : 0764-4450
Several sequences characterize the volcano of Bournac situated on the NW plateau of the Mézenc in the East Velay district. The beginning of the eruption was hydro-magmatic including intrusive dykes and a diatreme enclosing deep xenoliths, underlying a maar. Tephras and lava-flows overlapped directly during a vulcano-strombolian second phase. The K-Ar dating enables us to date the cessation of the eruptive activity of the massif including Bournac to approximately 7 Ma during Upper Miocene. In this first global mapping, this work establishes the dynamism of the Haute-Loire rift Notice N D00173
tablie par :
JEAN JACQUES LEOGIER
cre le 2007-10-11
mise jour le 2007-10-11

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