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Journal of the Geological Society; 1999; v. 156; issue.5; p. 991-1002;
DOI: 10.1144/gsjgs.156.5.0991
© 1999 Geological Society of London

Article

Emplacement of the Aya Variscan granitic pluton (Basque Pyrenees) in a dextral transcurrent regime inferred from a combined magneto-structural and gravimetric study

P. OLIVIER1, L. AMÉGLIO1, H. RICHEN1 & F. VADEBOIN2

1 LMTG, Equipe de Petrophysique et Tectonique, Universite Paul Sabatier et CNRS UMR 5563, 38 rue des Trente-Six Ponts, 31400 Toulouse, France (e-mail: olivier{at}lucid.ups-tlse.fr)
2 CEREGE UMR 6635, Europole de I'Arbois BP80, 13545 Aix en Provence Cedex 4 (France)

Magmatic structure, three-dimensional shape and emplacement mode of the Aya pluton, Variscan Pyrenees, have been studied by combining magneto-structural and gravimetric studies. The Aya pluton displays a fabric, acquired using the anisotropy of magnetic susceptibility technique, comparable to that of several other plutons in the Pyrenees, with shallow-plunging lineations and steep foliations trending E-W and NE-SW, forming an S pattern in map view. Gravity modelling was used to determine the probable root of the pluton, directly below the most basic (gabbro-dioritic) facies. This has a funnel shape, with an E-W-trending elliptical horizontal section and a maximum depth of 3.5 km. These different data demonstrate that this pluton was synorogenically emplaced during the main D2 Variscan tectonic phase, in a dextral transcurrent regime.

Key Words: Aya granite • Variscan orogeny • Pyrenees • AMS • gravity surveys




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