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A Tonian volcano-sedimentary succession in Newfoundland, eastern North America: A post-Grenvillian link to the Asgard Sea?

Strowbridge, Susan, Indares, Aphrodite, Dunning, Greg, Wälle, Markus·2022·Geology
DOI 10.1130/g49885.1
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Abstract

Early Tonian bimodal volcanic and sedimentary rocks (the Pine Pond succession) were identified in the Appalachians of eastern Laurentia for the first time, with U-Pb ages of igneous zircon at 951.4 ± 9 Ma for a felsic tuff and 952 ± 10 Ma for a crosscutting granite sheet. This Neoproterozoic succession is part of the East Pond metamorphic suite on the Baie Verte Peninsula (Newfoundland, Canada), which also contains 1491 Ma orthogneiss and is consistent with deposition over Mesoproterozoic basement in a pre-Iapetan extensional setting. Collectively, the data suggest a correlation with the southern Labrador Pinware terrane of the Grenville Province, where 1.52–1.46 Ga bedrock is intruded by 975–950 Ma granite. In addition, the age and location of this 952 Ma succession are consistent with deposition on the western margin of the Asgard Sea. Thus, the Pine Pond succession provides a link between key events in the assembly of the supercontinent Rodinia: the end of the Grenville orogeny, which led to the amalgamation of Laurentia and Amazonia, and the early Neoproterozoic evolution of the Asgard Sea, which separated Laurentia and Baltica.

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  • A recent discovery of 975-950 Ma bimodal volcaniclastic sequences geochemically affiliated to these granites and associated with Pinwarian rocks in the basement of Newfoundland Appalachians points to a linkage with late stages of opening of the Asgard sea.

    “However, a recent discovery of 975-950 Ma bimodal volcaniclastic sequences geochemically affiliated to these granites and associated with Pinwarian rocks in the basement of Newfoundland Appalachians, points to a linkage with late stages of opening of the Asgard sea (Strowbridge et al. 2022).”

    From The Grenville Province: revisiting the orogenic framework and integrating recent findings (2025) · cites this paper as Strowbridge et al. 2022

  • The late to post Rigolet-age alkaline granitoids in Pinware terrane are unrelated to the Grenvillian orogeny.

    “The late to post Rigolet-age alkaline granitoids in Pinware terrane are unrelated to the Grenvillian orogeny (Strowbridge et al. 2022).”

    From The Grenville Province: revisiting the orogenic framework and integrating recent findings (2025) · cites this paper as Strowbridge et al. 2022

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Research works printed but not linked: 30

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Metadata

Authors
Strowbridge, S., Indares, A., Dunning, G., & Wälle, M.
Affiliations
Department of Earth Sciences, Memorial University of Newfoundland, St. John's, Newfoundland A1B 3X5, Canada
Venue
Geology
Publisher
Geological Society of America
Published
2022-03-08
Volume
50
Issue
6
Pages
655-659
ISSN
  • 0091-7613
  • 1943-2682
DOI
10.1130/g49885.1
Cited by
12
References
0
Language
en

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