Age of the magmatism related to the inverted Stephanian–Permian basin of the Sallent area (Pyrenees)
Lidia Rodríguez-Méndez, Julia Cuevas, José Julián Esteban, José M. Tubía, Sergei Sergeev, Alexander Larionov, 2014. "Age of the magmatism related to the inverted Stephanian–Permian basin of the Sallent area (Pyrenees)", Deformation Structures and Processes within the Continental Crust, S. Llana-Fúnez, A. Marcos, F. Bastida
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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 (2σ) 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.
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Deformation Structures and Processes within the Continental Crust
This volume presents a selection of papers showing the current focus of studies of deformation structures and processes within the continental crust. The selected contributions use a large range of analytical techniques suited to the full range of structure sizes and fine-tuned to the physical process that controls the deformation, from the grain boundary at the micro-scale, the lithological contact at the meso-scale to the plate boundary at the global scale.
The papers in the volume are grouped into three sections relating to specific lines of research within the analysis of rock deformation structures and processes, in particular in respect to the continental crust: structures within shear zones and faults; magmatic structures, and microstructures and rheology. These sections include papers describing field studies, experimental rock deformation and numerical modelling of deformation processes.