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Was the Valaisan basin floored by oceanic crust? Evidence of permian magmatism in the Versoyen Unit (Valaisan Domain, NW Alps)

Beltrando, Marco; Rubatto, Daniela; Compagnoni, Roberto; Lister, Gordon


The Versoyen Unit (Western Alps) and its mafic rocks have been long considered the remnants of the oceanic crust that supposedly floored the Valaisan basin during the Cretaceous. Here we present U-Pb dating of zircons from a metaleucogabbro and a metagranite from the Versoyen Unit challenging this view. Magmatic zircon cores yield Permian ages of 267±1 and 272±2 Ma, respectively, which are interpreted as dating the crystallization of the magmas. Older inherited crystals and rare Cretaceous...[Show more]

CollectionsANU Research Publications
Date published: 2007
Type: Journal article
Source: Ofioliti


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