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Tonian–Ediacaran tectonomagmatic evolution of West Avalonia and its Ediacaran–early Cambrian interactions with Ganderia: an example of complex terrane transfer due to arc–arc collision?

View ORCID ProfileC. R. van Staal, View ORCID ProfileS. M. Barr, View ORCID ProfileP. J. A. McCausland, M. D. Thompson and C. E. White
Geological Society, London, Special Publications, 503, 143-167, 5 June 2020, https://doi.org/10.1144/SP503-2020-23
C. R. van Staal
1Geological Survey of Canada, 1500–604 Robson Street, Vancouver, British Columbia, Canada V6B 5J3
2Department of Earth and Environmental Science, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada N2L 3G1
Roles: [Conceptualization (Lead)], [Writing - Original Draft (Lead)], [Writing - Review & Editing (Lead)]
  • Find this author on Google Scholar
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  • ORCID record for C. R. van Staal
  • For correspondence: cees.vanstaal@canada.ca
S. M. Barr
3Department of Earth and Environmental Science, Acadia University, 12 University Avenue, Wolfville, Nova Scotia, Canada B4P 2R6
Roles: [Writing - Original Draft (Supporting)], [Writing - Review & Editing (Equal)]
  • Find this author on Google Scholar
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  • ORCID record for S. M. Barr
P. J. A. McCausland
4Department of Earth Sciences, University of Western Ontario, 1151 Richmond Street North, London, Otario, Canada N6A 5B7
Roles: [Writing - Original Draft (Supporting)], [Writing - Review & Editing (Equal)]
  • Find this author on Google Scholar
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  • ORCID record for P. J. A. McCausland
M. D. Thompson
5Department of Geosciences, Wellesley College, 106 Central Street, Wellesley, MA 024812, USA
Roles: [Writing - Original Draft (Supporting)], [Writing - Review & Editing (Equal)]
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C. E. White
6Nova Scotia Department of Energy and Mines, PO Box 698, Halifax, Nova Scotia, Canada B3J 2T9
Roles: [Writing - Original Draft (Supporting)], [Writing - Review & Editing (Supporting)]
  • Find this author on Google Scholar
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Abstract

The Neoproterozoic tectonomagmatic evolution of West Avalonia comprises four major events. Tectonism started with the formation of a Tonian passive margin on a Baltica-derived ribbon dispersed into the Mirovoi Ocean. Obduction of an oceanic terrane onto the ribbon produced olistostromes, deformation and metamorphism before 750 Ma. Obduction was followed by a Tonian (750–730 Ma) arc on the created composite crust. A pause in magmatism between 730 and 700 Ma is the next event. Subsequently, a Cyrogenian (700–670 Ma) arc was formed, which may have collided with Baltica or another buoyant element nearby. Thereafter, a long-lasting (640–565 Ma) continental arc was erected which, combined with the late Ediacaran–Early Paleozoic sedimentary cover, represents the hallmark of West Avalonia. A Caribbean-style incursion of the Ediacaran arc into the widening Tornquist gap between Amazonia and Baltica led to a diachronous collision with the Ganderian arc. Strike-slip slivering produced a complex transfer of terranes to both: Carolinia and smaller terranes to Ganderia, and East Avalonia to West Avalonia. The Rheic Ocean opened diachronously at c. 500 Ma, following a plate reorganization and re-establishment of an oblique subduction zone beneath Amazonia. As a result, Avalonia and Ganderia became progressively separated and dispersed into the Iapetus Ocean.

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Geological Society, London, Special Publications: 503 (1)
Geological Society, London, Special Publications
Volume 503
2021
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Tonian–Ediacaran tectonomagmatic evolution of West Avalonia and its Ediacaran–early Cambrian interactions with Ganderia: an example of complex terrane transfer due to arc–arc collision?

C. R. van Staal, S. M. Barr, P. J. A. McCausland, M. D. Thompson and C. E. White
Geological Society, London, Special Publications, 503, 143-167, 5 June 2020, https://doi.org/10.1144/SP503-2020-23
C. R. van Staal
1Geological Survey of Canada, 1500–604 Robson Street, Vancouver, British Columbia, Canada V6B 5J3
2Department of Earth and Environmental Science, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada N2L 3G1
Roles: [Conceptualization (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
  • ORCID record for C. R. van Staal
  • For correspondence: cees.vanstaal@canada.ca
S. M. Barr
3Department of Earth and Environmental Science, Acadia University, 12 University Avenue, Wolfville, Nova Scotia, Canada B4P 2R6
Roles: [Writing - Original Draft (Supporting)], [Writing - Review & Editing (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for S. M. Barr
P. J. A. McCausland
4Department of Earth Sciences, University of Western Ontario, 1151 Richmond Street North, London, Otario, Canada N6A 5B7
Roles: [Writing - Original Draft (Supporting)], [Writing - Review & Editing (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for P. J. A. McCausland
M. D. Thompson
5Department of Geosciences, Wellesley College, 106 Central Street, Wellesley, MA 024812, USA
Roles: [Writing - Original Draft (Supporting)], [Writing - Review & Editing (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
C. E. White
6Nova Scotia Department of Energy and Mines, PO Box 698, Halifax, Nova Scotia, Canada B3J 2T9
Roles: [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

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Tonian–Ediacaran tectonomagmatic evolution of West Avalonia and its Ediacaran–early Cambrian interactions with Ganderia: an example of complex terrane transfer due to arc–arc collision?

C. R. van Staal, S. M. Barr, P. J. A. McCausland, M. D. Thompson and C. E. White
Geological Society, London, Special Publications, 503, 143-167, 5 June 2020, https://doi.org/10.1144/SP503-2020-23
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  • Article
    • Abstract
    • Tonian passive margin and earliest arc event
    • Cyrogenian tectonic evolution: early arc events
    • Ediacaran arc magmatism in Avalonia
    • Neoproterozoic deformation and tectonic events in West Avalonia
    • East Avalonia–West Avalonia relationships
    • Avalonia–Carolinia relationships
    • Ganderia
    • Late Ediacaran–early Cambrian Ganderia–Avalonia relationships
    • Tonian–Ediacaran provenance and palaeogeography of West Avalonia
    • Tectonic history and odyssey of West Avalonia during the Neoproterozoic and Early Paleozoic
    • Conclusions
    • Acknowledgements
    • Funding
    • Author contributions
    • Data availability statement
    • References
  • Figures & Data
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  • PDF

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