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Evolution of late Paleozoic shearing in the Cobequid Highlands: constraints on the fragmentation of the Appalachian Orogen in Nova Scotia along intra-continental shear zones

View ORCID ProfileDavid J. W. Piper and View ORCID ProfileGeorgia Pe-Piper
Geological Society, London, Special Publications, 503, 423-442, 20 May 2020, https://doi.org/10.1144/SP503-2019-239
David J. W. Piper
1Natural Resources Canada, Geological Survey of Canada (Atlantic), Bedford Institute of Oceanography, PO Box 1006, Dartmouth, Nova Scotia, Canada B2Y 4A2
Roles: [Conceptualization (Equal)], [Funding acquisition (Supporting)], [Investigation (Equal)], [Methodology (Supporting)], [Writing - Original Draft (Lead)], [Writing - Review & Editing (Equal)]
  • Find this author on Google Scholar
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  • For correspondence: david.piper@canada.ca
Georgia Pe-Piper
2Department of Geology, Saint Mary's University, Halifax, Nova Scotia, Canada B3H 3C3
Roles: [Conceptualization (Equal)], [Data curation (Lead)], [Formal analysis (Equal)], [Funding acquisition (Equal)], [Investigation (Lead)], [Methodology (Lead)], [Project administration (Lead)], [Supervision (Lead)], [Writing - Original Draft (Supporting)], [Writing - Review & Editing (Equal)]
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Abstract

The Cobequid Highlands of northern Nova Scotia lie at the intersection of two major dextral intra-continental shear zones which developed during closure of the Rheic Ocean and formation of Pangea. The Cobequid Shear Zone was an ENE–WSW transfer zone in a NE–SW-trending, orogen-parallel, shear system in the late Devonian–early Carboniferous (Neo-Acadian phase), in which syntectonic granite–gabbro plutons and volcanic strata <4 km thick were progressively deformed along multiple faults. In the Late Carboniferous–Permian, the Alleghanian collision of Africa with Laurentia formed the east–west-trending Minas Fault Zone, reactivating parts of the Cobequid Shear Zone. This deformation was mostly taken up on the master Cobequid–Chedabucto Fault. Deformation chronology is well constrained by the biostratigraphy of syntectonic sedimentary rocks, and by radiometrically dated igneous rocks and minerals in faults and veins. Early strike-slip faults were lubricated by magmatic heating, leading to dyke-to-pluton construction along multiple faults. During cooling, rooted gabbro was more resistant than ductile granite, thereby deflecting solid-state deformation. Neo-Acadian strike-slip displacement across the shear zone is estimated as >50 km. The location of Alleghanian deformation was influenced by the paucity of magmatism and the resistance offered by older stitching plutons.

  • © 2020 Her Majesty the Queen in Right of Canada, as represented by the Minister of Natural Resources. 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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Evolution of late Paleozoic shearing in the Cobequid Highlands: constraints on the fragmentation of the Appalachian Orogen in Nova Scotia along intra-continental shear zones

David J. W. Piper and Georgia Pe-Piper
Geological Society, London, Special Publications, 503, 423-442, 20 May 2020, https://doi.org/10.1144/SP503-2019-239
David J. W. Piper
1Natural Resources Canada, Geological Survey of Canada (Atlantic), Bedford Institute of Oceanography, PO Box 1006, Dartmouth, Nova Scotia, Canada B2Y 4A2
Roles: [Conceptualization (Equal)], [Funding acquisition (Supporting)], [Investigation (Equal)], [Methodology (Supporting)], [Writing - Original Draft (Lead)], [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 David J. W. Piper
  • For correspondence: david.piper@canada.ca
Georgia Pe-Piper
2Department of Geology, Saint Mary's University, Halifax, Nova Scotia, Canada B3H 3C3
Roles: [Conceptualization (Equal)], [Data curation (Lead)], [Formal analysis (Equal)], [Funding acquisition (Equal)], [Investigation (Lead)], [Methodology (Lead)], [Project administration (Lead)], [Supervision (Lead)], [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 Georgia Pe-Piper

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Evolution of late Paleozoic shearing in the Cobequid Highlands: constraints on the fragmentation of the Appalachian Orogen in Nova Scotia along intra-continental shear zones

David J. W. Piper and Georgia Pe-Piper
Geological Society, London, Special Publications, 503, 423-442, 20 May 2020, https://doi.org/10.1144/SP503-2019-239
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    • Abstract
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    • Synthesis of the late Devonian–Carboniferous evolution of the Cobequid Highlands
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