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Structure and U–Pb dating of the Saint-Arnac pluton and the Ansignan charnockite (Agly Massif): a cross-section from the upper to the middle crust of the Variscan Eastern Pyrenees

Philippe Olivier, Gérard Gleizes, Jean-Louis Paquette and Carolina Muñoz Sáez
Journal of the Geological Society, 165, 141-152, 14 January 2008, https://doi.org/10.1144/0016-76492006-185
Philippe Olivier
1LMTG–UMR 5563, Université de Toulouse, CNRS, IRD, OMP, 14 Avenue Edouard Belin, 31400, Toulouse, France (e-mail: )
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Gérard Gleizes
1LMTG–UMR 5563, Université de Toulouse, CNRS, IRD, OMP, 14 Avenue Edouard Belin, 31400, Toulouse, France (e-mail: )
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Jean-Louis Paquette
2CNRS–UMR 6524 Magmas et Volcans, Université Blaise Pascal, 5 rue Kessler, 63038 Clermont-Ferrand, France
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Carolina Muñoz Sáez
3Departamento de Geología, Universidad de Chile, Casilla 13518, Correo 21, Santiago, Chile
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Abstract

In the Agly Massif (Pyrenees), two Variscan plutons, the Saint-Arnac pluton and the Ansignan charnockite, intrude different levels of a c. 10 km thick crustal section. The Saint-Arnac pluton intrudes through upper crustal rocks and the Ansignan charnockite cuts mid-crustal country-rocks. A structural study of these plutons based on the anisotropy of magnetic susceptibility technique, combined with a kinematic study of the country-rocks, shows that the structures and emplacement modes of the plutons are compatible with those of the other plutons of the Pyrenees emplaced during the D2 transpressive phase. U–Pb dating on zircons from the Saint-Arnac pluton yields a 308.3 ± 1.2 Ma age for a diorite and a 303.6 ± 4.7 Ma age for a granodiorite. The charnockite was previously dated at 315 Ma. The emplacement ages of these two intrusions are thus separated by at least 5 Ma. First, numerous sills and laccoliths, such as the Ansignan laccolith, were injected in the middle crust, and this induced heating and thickening. Subsequently, the large Saint-Arnac pluton was injected in the upper crust at the beginning of formation of a gneissic dome.

  • © 2008 The Geological Society of London
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Journal of the Geological Society: 165 (1)
Journal of the Geological Society
Volume 165, Issue 1
January 2008
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Structure and U–Pb dating of the Saint-Arnac pluton and the Ansignan charnockite (Agly Massif): a cross-section from the upper to the middle crust of the Variscan Eastern Pyrenees

Philippe Olivier, Gérard Gleizes, Jean-Louis Paquette and Carolina Muñoz Sáez
Journal of the Geological Society, 165, 141-152, 14 January 2008, https://doi.org/10.1144/0016-76492006-185
Philippe Olivier
1LMTG–UMR 5563, Université de Toulouse, CNRS, IRD, OMP, 14 Avenue Edouard Belin, 31400, Toulouse, France (e-mail: )
  • Find this author on Google Scholar
  • Find this author on PubMed
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Gérard Gleizes
1LMTG–UMR 5563, Université de Toulouse, CNRS, IRD, OMP, 14 Avenue Edouard Belin, 31400, Toulouse, France (e-mail: )
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Jean-Louis Paquette
2CNRS–UMR 6524 Magmas et Volcans, Université Blaise Pascal, 5 rue Kessler, 63038 Clermont-Ferrand, France
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Carolina Muñoz Sáez
3Departamento de Geología, Universidad de Chile, Casilla 13518, Correo 21, Santiago, Chile
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  • Find this author on PubMed
  • Search for this author on this site

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Structure and U–Pb dating of the Saint-Arnac pluton and the Ansignan charnockite (Agly Massif): a cross-section from the upper to the middle crust of the Variscan Eastern Pyrenees

Philippe Olivier, Gérard Gleizes, Jean-Louis Paquette and Carolina Muñoz Sáez
Journal of the Geological Society, 165, 141-152, 14 January 2008, https://doi.org/10.1144/0016-76492006-185
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  • Article
    • Abstract
    • Geological setting
    • AMS study of the Saint-Arnac and Ansignan plutons
    • Structure and kinematics of the country-rocks of the Agly plutons
    • U–Pb dating of the Saint-Arnac granodiorite and the Tournefort diorite
    • Discussion
    • Conclusion
    • Acknowledgements
    • References
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