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Geochronology of the Iberian Pyrite Belt and the Sierra Norte Batholith: lower plate magmatism during supercontinent amalgamation?

Lori E. Paslawski, James A. Braid, Cecilio Quesada and C. M. McFarlane
Geological Society, London, Special Publications, 503, 589-617, 22 July 2020, https://doi.org/10.1144/SP503-2020-5
Lori E. Paslawski
1Department of Earth Sciences, St Francis Xavier University, 5009 Chapel Square, Antigonish, Nova Scotia, Canada B2G 2W5
Roles: [Conceptualization (Equal)], [Investigation (Lead)], [Methodology (Lead)], [Visualization (Lead)], [Writing - Original Draft (Lead)]
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James A. Braid
1Department of Earth Sciences, St Francis Xavier University, 5009 Chapel Square, Antigonish, Nova Scotia, Canada B2G 2W5
Roles: [Conceptualization (Equal)], [Funding acquisition (Lead)], [Investigation (Supporting)], [Methodology (Equal)], [Project administration (Lead)], [Resources (Supporting)], [Writing - Original Draft (Supporting)], [Writing - Review & Editing (Supporting)]
  • Find this author on Google Scholar
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  • For correspondence: jbraid@stfx.ca
Cecilio Quesada
2Instituto Geológico y Minero de España, Ríos Rosas, 23 28003 Madrid, Spain
Roles: [Conceptualization (Supporting)], [Investigation (Supporting)], [Methodology (Supporting)], [Resources (Supporting)], [Supervision (Supporting)], [Writing - Review & Editing (Supporting)]
  • Find this author on Google Scholar
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C. M. McFarlane
3Department of Earth Sciences, University of New Brunswick, PO Box 4400, Fredericton, New Brunswick, Canada E3B 5A3
Roles: [Data curation (Lead)], [Resources (Supporting)], [Software (Lead)]
  • Find this author on Google Scholar
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Abstract

Protracted magmatism has long been recognized in the exotic South Portuguese Zone of southern Iberia where Early–Late Devonian volcano-sedimentary successions potentially record processes associated with ocean closure and continental collision associated with the formation of Pangaea. Collectively, these rocks represent a bimodal, predominantly submarine volcanic succession with massive sulfides spatially associated with basalts and rhyolites. Volcanic rocks are intruded by the voluminous Sierra Norte Batholith. Although the region hosts some of the world's largest ore deposits, the temporal and genetic relationships between the Iberian Pyrite Belt, the Sierra Norte Batholith and the evolution of the Variscan Orogen remain enigmatic. In an attempt to better understand these complexities, field investigations and targeted geochronology were completed throughout the volcanic and sedimentary rocks of the Iberian Pyrite Belt, and the plutonic rocks of the proximal Sierra Norte Batholith. Our results suggest that the emplacement of the pyrite belt was both pre- and syncollisional, and was initiated primarily by lithospheric delamination related to tectonic escape and crustal thinning of the lower plate. In this scenario, protracted magmatism occurred in both subaerial and subaqueous settings from c. 370 to 338 Ma.

  • © 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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Geochronology of the Iberian Pyrite Belt and the Sierra Norte Batholith: lower plate magmatism during supercontinent amalgamation?

Lori E. Paslawski, James A. Braid, Cecilio Quesada and C. M. McFarlane
Geological Society, London, Special Publications, 503, 589-617, 22 July 2020, https://doi.org/10.1144/SP503-2020-5
Lori E. Paslawski
1Department of Earth Sciences, St Francis Xavier University, 5009 Chapel Square, Antigonish, Nova Scotia, Canada B2G 2W5
Roles: [Conceptualization (Equal)], [Investigation (Lead)], [Methodology (Lead)], [Visualization (Lead)], [Writing - Original Draft (Lead)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
James A. Braid
1Department of Earth Sciences, St Francis Xavier University, 5009 Chapel Square, Antigonish, Nova Scotia, Canada B2G 2W5
Roles: [Conceptualization (Equal)], [Funding acquisition (Lead)], [Investigation (Supporting)], [Methodology (Equal)], [Project administration (Lead)], [Resources (Supporting)], [Writing - Original Draft (Supporting)], [Writing - Review & Editing (Supporting)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: jbraid@stfx.ca
Cecilio Quesada
2Instituto Geológico y Minero de España, Ríos Rosas, 23 28003 Madrid, Spain
Roles: [Conceptualization (Supporting)], [Investigation (Supporting)], [Methodology (Supporting)], [Resources (Supporting)], [Supervision (Supporting)], [Writing - Review & Editing (Supporting)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
C. M. McFarlane
3Department of Earth Sciences, University of New Brunswick, PO Box 4400, Fredericton, New Brunswick, Canada E3B 5A3
Roles: [Data curation (Lead)], [Resources (Supporting)], [Software (Lead)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site

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Geochronology of the Iberian Pyrite Belt and the Sierra Norte Batholith: lower plate magmatism during supercontinent amalgamation?

Lori E. Paslawski, James A. Braid, Cecilio Quesada and C. M. McFarlane
Geological Society, London, Special Publications, 503, 589-617, 22 July 2020, https://doi.org/10.1144/SP503-2020-5
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  • Article
    • Abstract
    • Geological background
    • Field relationships
    • Sample selection and petrography
    • Geochronology
    • Interpretation of crystallization ages
    • Results
    • Interpretations: geochronology and field relationships
    • Geodynamic implications
    • Conclusions
    • Acknowledgements
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