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Deciphering the Sardic (Ordovician) and Variscan deformations in the Eastern Pyrenees, SW Europe

View ORCID ProfileClaudia Puddu, View ORCID ProfileJ. Javier Álvaro, View ORCID ProfileNúria Carrera and View ORCID ProfileJosep Maria Casas
Journal of the Geological Society, 176, 1191-1206, 30 July 2019, https://doi.org/10.1144/jgs2019-057
Claudia Puddu
Dpto. Ciencias de la Tierra, Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
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  • ORCID record for Claudia Puddu
J. Javier Álvaro
Instituto de Geociencias (CSIC-UCM), Dr. Severo Ochoa 7, 28040 Madrid, Spain
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  • ORCID record for J. Javier Álvaro
Núria Carrera
Dpt. de Dinàmica de la Terra i de l'Oceà, Universitat de Barcelona–Institut de Recerca GEOMODELS, Martí Franquès s/n, 08028 Barcelona, Spain
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Josep Maria Casas
Dpt. de Dinàmica de la Terra i de l'Oceà, Universitat de Barcelona–Institut de Recerca GEOMODELS, Martí Franquès s/n, 08028 Barcelona, Spain
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  • For correspondence: casas@ub.edu
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Abstract

Detailed geological mapping of the La Cerdanya area (Canigó unit, Eastern Pyrenees) provides new data characterizing the different structural styles exhibited by Cambrian–Lower Ordovician (Jujols Group) and Upper Ordovician successions. Their unconformable contact, related to the Sardic Phase, ranges from 0° (paraconformity) to 90° (angular discordance). The Jujols Group rocks topped by the unconformity are affected by Sardic foliation-free open folds. The pre-Sardic succession, the Sardic Unconformity and the lower part of the post-Sardic succession (Rabassa Conglomerate and Cava formations) are cut and offset by several Late Ordovician NNE–SSW-trending synsedimentary extensional faults associated with hydrothermal activity, which dramatically affected the thickness of the lower part of the Upper Ordovician succession. We relate (1) the Mid-Ordovician Sardic uplift and erosion, and (2) a Mid- to Late-Ordovician upward propagating extensional fault system bounding the outline of half-grabens, subsequently infilled by alluvial deposits, to a thermal doming event (about 475–450 Ma) that led to the uplift and stretching of the Ordovician lithosphere. Thermal doming may be caused by mafic magma underplating and responsible for the coeval calc-alkaline magmatic activity broadly developed in the Eastern Pyrenees. We discuss the similarities between the Mid-Ordovician Sardic Unconformity and other Early Paleozoic unconformities described in neighbouring areas. Finally, we suggest a geodynamic scenario in which a regional-scale thermal event was related to the opening of the Rheic Ocean that led to the drift of Avalonia from the SW European margin of Gondwana.

  • © 2019 The Author(s). Published by The Geological Society of London. All rights reserved
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Journal of the Geological Society: 176 (6)
Journal of the Geological Society
Volume 176, Issue 6
November 2019
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Deciphering the Sardic (Ordovician) and Variscan deformations in the Eastern Pyrenees, SW Europe

Claudia Puddu, J. Javier Álvaro, Núria Carrera and Josep Maria Casas
Journal of the Geological Society, 176, 1191-1206, 30 July 2019, https://doi.org/10.1144/jgs2019-057
Claudia Puddu
Dpto. Ciencias de la Tierra, Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Claudia Puddu
J. Javier Álvaro
Instituto de Geociencias (CSIC-UCM), Dr. Severo Ochoa 7, 28040 Madrid, Spain
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for J. Javier Álvaro
Núria Carrera
Dpt. de Dinàmica de la Terra i de l'Oceà, Universitat de Barcelona–Institut de Recerca GEOMODELS, Martí Franquès s/n, 08028 Barcelona, Spain
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Núria Carrera
Josep Maria Casas
Dpt. de Dinàmica de la Terra i de l'Oceà, Universitat de Barcelona–Institut de Recerca GEOMODELS, Martí Franquès s/n, 08028 Barcelona, Spain
  • Find this author on Google Scholar
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  • ORCID record for Josep Maria Casas
  • For correspondence: casas@ub.edu

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Deciphering the Sardic (Ordovician) and Variscan deformations in the Eastern Pyrenees, SW Europe

Claudia Puddu, J. Javier Álvaro, Núria Carrera and Josep Maria Casas
Journal of the Geological Society, 176, 1191-1206, 30 July 2019, https://doi.org/10.1144/jgs2019-057
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