Publication Date:
2013-11-23
Description:
We have dated an alkaline diabase dyke from the Axial Zone of the Pyrenees near the village of Sallent (Spain), using a sensitive high-resolution ion microprobe (SHRIMP). The diabase dyke intrudes into Devonian rocks that constitute the basement of an inverted Stephanian–Permian basin. Five U–Pb analyses of zircon yield a concordant age of 259.2 ± 3.2 Ma (2) for the intrusion of the dyke. This age links diabase dykes with the magmatism associated with the opening of the Stephanian–Permian basins scattered along the Pyrenees. Previous data from the largest Anayet and Midi d'Ossau volcanic massifs, located to the NW of the studied dyke, indicate that the Permian magmatism develops from late Autunian/early Saxonian to Wordian ages. Consequently, this new age broadens the time span of the Permian magmatism of the Pyrenees. The work relates the structure of the Stephanian–Permian basin and the magmatism in order to explain the transition to the new geodynamic setting prevailing in the Pyrenees during the Mesozoic.
Print ISSN:
0305-8719
Electronic ISSN:
2041-4927
Topics:
Geosciences
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