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Petrogenesis of Siluro-Devonian rhyolites of the Tobique Group in the northwestern Appalachians (northern New Brunswick, Canada): tectonic implications for the accretion history of peri-Gondwanan terranes along the Laurentian margin

View ORCID ProfileJaroslav Dostal, Reginald A. Wilson and Pierre Jutras
Geological Society, London, Special Publications, 503, 391-407, 1 June 2020, https://doi.org/10.1144/SP503-2019-229
Jaroslav Dostal
1Department of Geology, Saint Mary's University, Halifax, Nova Scotia, Canada B3H 3C3
Roles: [Investigation (Equal)], [Writing - Original Draft (Lead)]
  • Find this author on Google Scholar
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  • ORCID record for Jaroslav Dostal
  • For correspondence: jdostal@smu.ca
Reginald A. Wilson
2235 Flemming Road, Fredericton, New Brunswick, Canada E3B 5J8
Roles: [Investigation (Equal)], [Writing - Review & Editing (Equal)]
  • Find this author on Google Scholar
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Pierre Jutras
1Department of Geology, Saint Mary's University, Halifax, Nova Scotia, Canada B3H 3C3
Roles: [Investigation (Equal)], [Writing - Review & Editing (Equal)]
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Abstract

Uppermost Silurian–Lower Devonian felsic rocks in the bimodal volcanic suite of the Tobique Group in the northwestern mainland Appalachians (northern New Brunswick, Canada) form part of an overstep sequence deposited across the accreted vestiges of Iapetus Ocean on composite Laurentia. Whereas the mafic rocks of the bimodal volcanic suite are continental tholeiites, the felsic rocks are peraluminous and possess geochemical characteristics of A2-type granites emplaced in post-collisional extensional settings. The major and trace element compositions of the felsic rocks indicate that they were generated by dehydration melting of late Precambrian granitoid rocks triggered by heat derived from the rising mafic magma. Unlike the basalts, which have positive εNd(t) values, the felsic rocks have values close to chondrites (−1.6 to +1.1), which is consistent with derivation from a crustal source. The rapid transition from compressional to extensional magmatism in latest Silurian–Early Devonian times in this part of Ganderia is probably due to Late Silurian Ganderia–Laurentia collision followed by slab breakoff. Based on Sm–Nd isotopic characteristics in their respective igneous rocks, both Ganderia and Avalonia are underlain by similar Neoproterozoic lower–middle crust and subcontinental lithospheric mantle.

  • © 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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Petrogenesis of Siluro-Devonian rhyolites of the Tobique Group in the northwestern Appalachians (northern New Brunswick, Canada): tectonic implications for the accretion history of peri-Gondwanan terranes along the Laurentian margin

Jaroslav Dostal, Reginald A. Wilson and Pierre Jutras
Geological Society, London, Special Publications, 503, 391-407, 1 June 2020, https://doi.org/10.1144/SP503-2019-229
Jaroslav Dostal
1Department of Geology, Saint Mary's University, Halifax, Nova Scotia, Canada B3H 3C3
Roles: [Investigation (Equal)], [Writing - Original Draft (Lead)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Jaroslav Dostal
  • For correspondence: jdostal@smu.ca
Reginald A. Wilson
2235 Flemming Road, Fredericton, New Brunswick, Canada E3B 5J8
Roles: [Investigation (Equal)], [Writing - Review & Editing (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Pierre Jutras
1Department of Geology, Saint Mary's University, Halifax, Nova Scotia, Canada B3H 3C3
Roles: [Investigation (Equal)], [Writing - Review & Editing (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site

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Petrogenesis of Siluro-Devonian rhyolites of the Tobique Group in the northwestern Appalachians (northern New Brunswick, Canada): tectonic implications for the accretion history of peri-Gondwanan terranes along the Laurentian margin

Jaroslav Dostal, Reginald A. Wilson and Pierre Jutras
Geological Society, London, Special Publications, 503, 391-407, 1 June 2020, https://doi.org/10.1144/SP503-2019-229
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