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Structural evolution and related implications for uranium mineralization in the Patterson Lake corridor, southwestern Athabasca Basin, Saskatchewan, Canada

View ORCID ProfileDillon D. Johnstone, Kathryn M. Bethune, Colin D. Card and View ORCID ProfileVictoria Tschirhart
Geochemistry: Exploration, Environment, Analysis, 21, geochem2020-030, 17 February 2021, https://doi.org/10.1144/geochem2020-030
Dillon D. Johnstone
1University of Regina
2Saskatchewan Geological Survey
Roles: [Data curation (Lead)], [Formal analysis (Lead)], [Investigation (Lead)], [Methodology (Equal)], [Software (Lead)], [Writing – original draft (Lead)]
  • Find this author on Google Scholar
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  • ORCID record for Dillon D. Johnstone
  • For correspondence: dillon.johnstone@gov.sk.ca
Kathryn M. Bethune
1University of Regina
Roles: [Formal analysis (Equal)], [Funding acquisition (Equal)], [Methodology (Equal)], [Supervision (Lead)], [Visualization (Equal)], [Writing – review & editing (Lead)]
  • Find this author on Google Scholar
  • Search for this author on this site
Colin D. Card
2Saskatchewan Geological Survey
Roles: [Formal analysis (Supporting)], [Methodology (Supporting)], [Supervision (Supporting)], [Writing – review & editing (Supporting)]
  • Find this author on Google Scholar
  • Search for this author on this site
Victoria Tschirhart
3Geological Survey of Canada
Roles: [Formal analysis (Supporting)], [Funding acquisition (Lead)], [Methodology (Equal)], [Project administration (Equal)], [Software (Supporting)], [Writing – review & editing (Equal)]
  • Find this author on Google Scholar
  • Search for this author on this site
  • ORCID record for Victoria Tschirhart
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Abstract

The Patterson Lake corridor is situated along the SW margin of the Athabasca Basin and contains several basement-hosted uranium deposits and prospects. Drill core investigations during this study have determined that granite, granodiorite, mafic and alkali intrusive basement rocks are entrained in a deep-seated NE-striking subvertical heterogeneous high-strain zone defined by anastomosing ductile to semi-brittle shears and brittle faults. The earliest phases of ductile deformation (D1/D2), linked with Taltson (1.94–1.92 Ga) orogenesis, involved interference between early fold sets (F1/F2) and development of an associated ductile transposition foliation (S1/S2). During subsequent Snowbird (c. 1.91–1.90 Ga) tectonism, this composite foliation was re-folded (D3) by NE-trending buckle-style folds (F3), including a regional fold centred on the Clearwater aeromagnetic high. In continuum with D3, a network of dextral-reverse chloritic-graphitic shears, with C–S geometry, formed initially (D4a) and progressed to more discrete, spaced semi-brittle structures (D4b; c. 1.900–1.819 Ga). Basin development (D5a; <c. 1.819 Ga) was marked by a set of north-striking normal faults and related east- and NE-striking transfer faults that accommodated subsidence. Primary uranium mineralization (D5b; c. 1.45 Ga) was facilitated by brittle reactivation of NE-striking basement shears in response to WSW–ENE-directed compressional stress (σ1). Uraninite was emplaced along σ1-parallel extension fractures and dilational zones formed at linkages between NE- and ENE-striking dextral strike-slip faults. Uranium remobilization (D5c) occurred after σ1 shifted to WNW–ESE, giving rise to regional east- and SE-striking conjugate faults, along which mafic dykes (1.27 and 1.16 Ga) intruded.

Thematic collection: This article is part of the Uranium Fluid Pathways collection available at: https://www.lyellcollection.org/cc/uranium-fluid-pathways

  • unconformity-related uranium
  • Athabasca Basin
  • polydeformation
  • reactivation
  • shear
  • fault
  • © 2021 The Author(s). Published by The Geological Society of London for GSL and AAG. All rights reserved
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Geochemistry: Exploration, Environment, Analysis: 21 (1)
Geochemistry: Exploration, Environment, Analysis
Volume 21, Issue 1
February 2021
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Structural evolution and related implications for uranium mineralization in the Patterson Lake corridor, southwestern Athabasca Basin, Saskatchewan, Canada

Dillon D. Johnstone, Kathryn M. Bethune, Colin D. Card and Victoria Tschirhart
Geochemistry: Exploration, Environment, Analysis, 21, geochem2020-030, 17 February 2021, https://doi.org/10.1144/geochem2020-030
Dillon D. Johnstone
1University of Regina
2Saskatchewan Geological Survey
Roles: [Data curation (Lead)], [Formal analysis (Lead)], [Investigation (Lead)], [Methodology (Equal)], [Software (Lead)], [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 Dillon D. Johnstone
  • For correspondence: dillon.johnstone@gov.sk.ca
Kathryn M. Bethune
1University of Regina
Roles: [Formal analysis (Equal)], [Funding acquisition (Equal)], [Methodology (Equal)], [Supervision (Lead)], [Visualization (Equal)], [Writing – review & editing (Lead)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Colin D. Card
2Saskatchewan Geological Survey
Roles: [Formal analysis (Supporting)], [Methodology (Supporting)], [Supervision (Supporting)], [Writing – review & editing (Supporting)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Victoria Tschirhart
3Geological Survey of Canada
Roles: [Formal analysis (Supporting)], [Funding acquisition (Lead)], [Methodology (Equal)], [Project administration (Equal)], [Software (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 Victoria Tschirhart

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Structural evolution and related implications for uranium mineralization in the Patterson Lake corridor, southwestern Athabasca Basin, Saskatchewan, Canada

Dillon D. Johnstone, Kathryn M. Bethune, Colin D. Card and Victoria Tschirhart
Geochemistry: Exploration, Environment, Analysis, 21, geochem2020-030, 17 February 2021, https://doi.org/10.1144/geochem2020-030
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  • Article
    • Abstract
    • Regional geology
    • Local geology and previous work
    • Methods
    • Regional and local structural framework based on geophysical interpretations
    • Local architecture of the corridor
    • Pre-Athabasca structures
    • Pre- to syn-Athabasca structures
    • Syn- to post-Athabasca structures
    • Structural interpretation
    • Timing and origin of graphite
    • Summary and conclusions
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