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Geological Society, London, Special Publications

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Updated geochronology and isotope geochemistry of the Vila de Cruces Ophiolite: a case study of a peri-Gondwanan back-arc ophiolite

View ORCID ProfileSonia Sánchez Martínez, View ORCID ProfileRicardo Arenas, View ORCID ProfileRichard Albert, View ORCID ProfileAxel Gerdes and View ORCID ProfileJavier Fernández-Suárez
Geological Society, London, Special Publications, 503, 497-530, 29 May 2020, https://doi.org/10.1144/SP503-2020-8
Sonia Sánchez Martínez
1Departamento de Mineralogía y Petrología and Instituto de Geociencias (UCM, CSIC), Universidad Complutense, 28040 Madrid, Spain
Roles: [Investigation (Lead)]
  • Find this author on Google Scholar
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  • ORCID record for Sonia Sánchez Martínez
  • For correspondence: s.sanchez@geo.ucm.es
Ricardo Arenas
1Departamento de Mineralogía y Petrología and Instituto de Geociencias (UCM, CSIC), Universidad Complutense, 28040 Madrid, Spain
Roles: [Investigation (Lead)]
  • Find this author on Google Scholar
  • Search for this author on this site
  • ORCID record for Ricardo Arenas
Richard Albert
2Institut für Geowissenschaften, Goethe-University Frankfurt, 60438 Frankfurt, Germany
Roles: [Investigation (Equal)]
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  • ORCID record for Richard Albert
Axel Gerdes
2Institut für Geowissenschaften, Goethe-University Frankfurt, 60438 Frankfurt, Germany
Roles: [Investigation (Equal)]
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  • ORCID record for Axel Gerdes
Javier Fernández-Suárez
1Departamento de Mineralogía y Petrología and Instituto de Geociencias (UCM, CSIC), Universidad Complutense, 28040 Madrid, Spain
Roles: [Investigation (Equal)]
  • Find this author on Google Scholar
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  • ORCID record for Javier Fernández-Suárez
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Abstract

In the Variscan Orogen, the NW Iberian Massif exposes a variety of ophiolites formed at c. 500 and c. 400 Ma that provide constraints on the Paleozoic evolution of the NNW African margin of Gondwana which culminated in the assembly of Pangaea. New U–Pb ages obtained in zircon from one of these ophiolites, the Vila de Cruces Ophiolite, confirm the previous U–Pb age of c. 500 Ma (thermal ionization mass spectrometry (TIMS)) obtained in zircon from a tonalitic orthogneiss. New samples of the same orthogneiss and related gabbros provided ages (laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS)) in the range 498–492 Ma, with the metagabbros being the youngest. Moreover, two different gabbro samples contain a scattered population of inherited zircon grains with an average age of c. 1150 Ma. These zircons probably represent xenolitic material included in the gabbros during their ascent and intrusion along the margin of Gondwana. Taking into account the architecture of the Vila de Cruces Ophiolite and its geochemical composition, this ophiolite is interpreted as a section of oceanic or transitional lithosphere formed in a back-arc basin opened in the peri-Gondwanan realm. The presence of inherited Mesoproterozoic zircons is likely to suggest the existence of a hidden unexposed Mesoproterozoic basement in the Gondwana margin during Paleozoic times.

  • © 2020 The Author(s). Published by The Geological Society of London. All rights reserved
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Geological Society, London, Special Publications: 503 (1)
Geological Society, London, Special Publications
Volume 503
2021
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Updated geochronology and isotope geochemistry of the Vila de Cruces Ophiolite: a case study of a peri-Gondwanan back-arc ophiolite

Sonia Sánchez Martínez, Ricardo Arenas, Richard Albert, Axel Gerdes and Javier Fernández-Suárez
Geological Society, London, Special Publications, 503, 497-530, 29 May 2020, https://doi.org/10.1144/SP503-2020-8
Sonia Sánchez Martínez
1Departamento de Mineralogía y Petrología and Instituto de Geociencias (UCM, CSIC), Universidad Complutense, 28040 Madrid, Spain
Roles: [Investigation (Lead)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Sonia Sánchez Martínez
  • For correspondence: s.sanchez@geo.ucm.es
Ricardo Arenas
1Departamento de Mineralogía y Petrología and Instituto de Geociencias (UCM, CSIC), Universidad Complutense, 28040 Madrid, Spain
Roles: [Investigation (Lead)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Ricardo Arenas
Richard Albert
2Institut für Geowissenschaften, Goethe-University Frankfurt, 60438 Frankfurt, Germany
Roles: [Investigation (Equal)]
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  • Search for this author on this site
  • ORCID record for Richard Albert
Axel Gerdes
2Institut für Geowissenschaften, Goethe-University Frankfurt, 60438 Frankfurt, Germany
Roles: [Investigation (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Axel Gerdes
Javier Fernández-Suárez
1Departamento de Mineralogía y Petrología and Instituto de Geociencias (UCM, CSIC), Universidad Complutense, 28040 Madrid, Spain
Roles: [Investigation (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
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  • ORCID record for Javier Fernández-Suárez

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Updated geochronology and isotope geochemistry of the Vila de Cruces Ophiolite: a case study of a peri-Gondwanan back-arc ophiolite

Sonia Sánchez Martínez, Ricardo Arenas, Richard Albert, Axel Gerdes and Javier Fernández-Suárez
Geological Society, London, Special Publications, 503, 497-530, 29 May 2020, https://doi.org/10.1144/SP503-2020-8
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    • Abstract
    • Geological setting
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