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Structure, age and mode of emplacement of the Hercynian Bordères-Louron pluton (Central Pyrenees, France)

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Abstract

The Hercynian Bordères-Louron pluton (20 km2) in the Central Pyrenees intrudes Devonian and Carboniferous metasediments. It shows a concentric zoning and consists of a significant proportion of (quartz) gabbros in its periphery, and of granodiorites, biotite monzogranites and biotite-muscovite monzogranites in its core. AMS study shows that the pluton corresponds to an elongated dome with a N100°E-trending axis. The anisotropy intensity Ppara% is high in the south and in the core of the pluton, whereas it is low in the north. The shape parameter T indicates that the fabric is strongly planar in a large central band oriented NW-SE, whereas it is strongly linear in the western and eastern tips of the pluton. These characteristics suggest that the Bordères-Louron pluton emplaced in two episodes: (1) intrusion of mafic magmas along a N100°E sill parallel to the regional foliation of the host metasediments; and (2) injection of three successive silicic batches (granodiorite, biotite monzogranite, two-micas monzogranite) which pushed aside the early mafic injections. In situ U-Pb dating of zircon grains indicates that the emplacement age of the biotite monzogranite is 309 ± 4 Ma, synchronous with the D 2 dextral transpressive event and close to the ages of the eastern Pyrenean plutons, may be slightly older.

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Acknowledgments

We thank D. Beziat for constructive discussions, R. Peyron and F. de Parseval for thin sections preparation, and C. Cavaré-Hester for her assistance in preparing drawings. This is a contribution of UMR CNRS/UPS 5563 ≪Laboratoire des Mécanismes et Transferts en Géologie≫, Equipe géodynamique.

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Authors and Affiliations

  1. CNRS-UMR 5563 LMTG, Université Paul Sabatier, 14 Avenue Edouard Belin, 31400, Toulouse, France

    Gérard Gleizes & Gérard Crevon

  2. Department of Earth Sciences, Addis Ababa University, P.O. Box 1176, Addis Ababa, Ethiopia

    Asfawossen Asrat

  3. CRPG-CNRS, B.P. 20, 54501, Vandoeuvre-les-Nancy Cedex, France

    Pierre Barbey

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  1. Gérard Gleizes
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  2. Gérard Crevon
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  3. Asfawossen Asrat
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  4. Pierre Barbey
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Correspondence to Gérard Gleizes.

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Gleizes, G., Crevon, G., Asrat, A. et al. Structure, age and mode of emplacement of the Hercynian Bordères-Louron pluton (Central Pyrenees, France). Int J Earth Sci (Geol Rundsch) 95, 1039–1052 (2006). https://doi.org/10.1007/s00531-006-0088-4

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  • DOI: https://doi.org/10.1007/s00531-006-0088-4

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