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Ages radiométriques K/Ar des éléments ophiolitiques de la nappe des Gets (Haute-Savoie, France)

Published inEclogae geologicae Helveticae, vol. 75, no. 1, p. 117-126
Publication date1982

Ophiolitic material from the nappe des Gets has been dated by conventional K/Ar and by total fusion 40Ar/39Ar methods. These ophiolites appear to belong to two. temporally distinct, magmatic episodes: — The first, of Lower to Middle Jurassic age. includes the gabbros and diabases associated with serpentinites. — The second, of Maastrichtian age. includes albite-chlorite diabases formed in submarine basaltic eruptions which probably occurred at about the same time as flysch sedimentation in Albian-Cenomanian times. Therefore, the age measured is considered to date a metamorphic event only. Finally, it should be noted that the albite-chlorite diabases from the col de la Ramaz zone seem to have ages older than other albite-chlorite diabases.

Citation (ISO format)
FONTIGNIE, Denis André, DELALOYE, Michel, BERTRAND, Jean. Ages radiométriques K/Ar des éléments ophiolitiques de la nappe des Gets (Haute-Savoie, France). In: Eclogae geologicae Helveticae, 1982, vol. 75, n° 1, p. 117–126. doi: 10.5169/seals-165220
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ISSN of the journal0012-9402

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