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Patterns of Silurian deformation and magmatism during sinistral oblique convergence, northern Scottish Caledonides

R. A. Strachan, G. I. Alsop, View ORCID ProfileJ. Ramezani, View ORCID ProfileR. E. Frazer, I. M. Burns and View ORCID ProfileR. E. Holdsworth
Journal of the Geological Society, 177, 893-910, 12 June 2020, https://doi.org/10.1144/jgs2020-039
R. A. Strachan
1School of the Environment, Geography and Geosciences, University of Portsmouth, Burnaby Road, Portsmouth PO1 3QL, UK
Roles: [Conceptualization (Lead)], [Investigation (Lead)], [Methodology (Lead)], [Supervision (Lead)], [Writing - Original Draft (Lead)], [Writing - Review & Editing (Lead)]
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  • For correspondence: [email protected]
G. I. Alsop
2Department of Geology and Geophysics, School of Geosciences, Kings College, University of Aberdeen, Aberdeen, AB24 3UE, UK
Roles: [Conceptualization (Supporting)], [Investigation (Supporting)], [Methodology (Supporting)], [Writing - Original Draft (Supporting)], [Writing - Review & Editing (Supporting)]
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J. Ramezani
3Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77, Massachusetts Avenue, Cambridge, MA 02139-4307, USA
Roles: [Formal analysis (Lead)], [Investigation (Equal)], [Writing - Original Draft (Supporting)], [Writing - Review & Editing (Supporting)]
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  • ORCID record for J. Ramezani
R. E. Frazer
3Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77, Massachusetts Avenue, Cambridge, MA 02139-4307, USA
Roles: [Formal analysis (Supporting)], [Investigation (Supporting)]
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  • ORCID record for R. E. Frazer
I. M. Burns
46, Mackenzie Crescent, Bettyhill, By Thurso, Sutherland KW14 7SY, UK
Roles: [Conceptualization (Supporting)], [Investigation (Supporting)], [Methodology (Supporting)]
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R. E. Holdsworth
5Department of Earth Sciences, The University, South Road, Durham DH1 3LE, UK
Roles: [Conceptualization (Supporting)], [Investigation (Supporting)], [Methodology (Supporting)], [Writing - Original Draft (Supporting)], [Writing - Review & Editing (Supporting)]
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Abstract

Regional ductile thrusting and syn-kinematic granitic magmatism within the Caledonides of northern Scotland occurred within a sinistrally oblique convergent tectonic setting during the Silurian closure of the Iapetus Ocean. The highest thrust nappes are dominated by structures of probable Grampian (Ordovician) age, and Scandian (Silurian) deformation dominates the underlying thrust nappes. Deformation was overall foreland-propagating but the nappe stack was modified by out-of-sequence thrusting and probable synchronous development of thrusts at different structural levels. Localized dextrally transpressive deformation is related to an inferred lateral ramp located offshore. New U–Pb zircon ages from syn-tectonic granites indicate that the internal Naver Thrust was active between c. 432 and c. 426 Ma. This is consistent with other data sets that indicate that contractional deformation and high-grade metamorphism, and by implication displacements in the Moine Thrust Zone, may have lasted until c. 420–415 Ma. The synchroneity of thrusting and strike-slip movements along the Great Glen Fault implies that partitioning of transpressional strain occurred above a regional basal decollement. The short duration of the Scandian orogen in Scotland (c. 437–415 Ma?) is consistent with only moderate crustal thickening and a location on the periphery of the main Laurentia–Baltica collision further north.

Supplementary material: Details of analytical procedures, complete U-Pb isotopic data and methods of U-Pb age calculation and error reporting are available at https://doi.org/10.6084/m9.figshare.c.4962251

  • © 2020 The Author(s). Published by The Geological Society of London. All rights reserved
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Journal of the Geological Society: 177 (5)
Journal of the Geological Society
Volume 177, Issue 5
September 2020
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Patterns of Silurian deformation and magmatism during sinistral oblique convergence, northern Scottish Caledonides

R. A. Strachan, G. I. Alsop, J. Ramezani, R. E. Frazer, I. M. Burns and R. E. Holdsworth
Journal of the Geological Society, 177, 893-910, 12 June 2020, https://doi.org/10.1144/jgs2020-039
R. A. Strachan
1School of the Environment, Geography and Geosciences, University of Portsmouth, Burnaby Road, Portsmouth PO1 3QL, UK
Roles: [Conceptualization (Lead)], [Investigation (Lead)], [Methodology (Lead)], [Supervision (Lead)], [Writing - Original Draft (Lead)], [Writing - Review & Editing (Lead)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: [email protected]
G. I. Alsop
2Department of Geology and Geophysics, School of Geosciences, Kings College, University of Aberdeen, Aberdeen, AB24 3UE, UK
Roles: [Conceptualization (Supporting)], [Investigation (Supporting)], [Methodology (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
J. Ramezani
3Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77, Massachusetts Avenue, Cambridge, MA 02139-4307, USA
Roles: [Formal analysis (Lead)], [Investigation (Equal)], [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
  • ORCID record for J. Ramezani
R. E. Frazer
3Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77, Massachusetts Avenue, Cambridge, MA 02139-4307, USA
Roles: [Formal analysis (Supporting)], [Investigation (Supporting)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for R. E. Frazer
I. M. Burns
46, Mackenzie Crescent, Bettyhill, By Thurso, Sutherland KW14 7SY, UK
Roles: [Conceptualization (Supporting)], [Investigation (Supporting)], [Methodology (Supporting)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
R. E. Holdsworth
5Department of Earth Sciences, The University, South Road, Durham DH1 3LE, UK
Roles: [Conceptualization (Supporting)], [Investigation (Supporting)], [Methodology (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
  • ORCID record for R. E. Holdsworth

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Patterns of Silurian deformation and magmatism during sinistral oblique convergence, northern Scottish Caledonides

R. A. Strachan, G. I. Alsop, J. Ramezani, R. E. Frazer, I. M. Burns and R. E. Holdsworth
Journal of the Geological Society, 177, 893-910, 12 June 2020, https://doi.org/10.1144/jgs2020-039
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  • Article
    • Abstract
    • Geological framework and synthesis of the Scandian thrust nappes in Sutherland
    • Structural domains and relative intensities of Scandian deformation
    • Magma emplacement during Scandian thrusting and deformation in the Torrisdale Steep Belt
    • Precise U–Pb zircon dating of syn- to late-tectonic granitic intrusions
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    • Acknowledgments
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