Characterization of the Wager shear zone, Nunavut, Canada: Insights from microstructures and geochronology - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue Canadian journal of earth sciences Année : 2023

Characterization of the Wager shear zone, Nunavut, Canada: Insights from microstructures and geochronology

Isabelle Therriault
Kyle Larson
  • Fonction : Auteur
Holly Steenkamp
Francisco Apen
  • Fonction : Auteur
Riccardo Graziani
  • Fonction : Auteur
Carl Guilmette
  • Fonction : Auteur
John Cottle
  • Fonction : Auteur

Résumé

The Wager shear zone is an ∼450-km long zone of high strain hosted within Proterozoic and Archean rocks of the Rae domain in northwestern Hudson Bay, Nunavut. New field mapping and microstructural analyzes, combined with titanite and apatite geochronology, define the style, kinematics, and timing of Proterozoic ductile deformation. The results indicate that the Wager shear zone accommodated high-temperature deformation between ca. 1.75 and 1.74 Ga with post-kinematic cooling through apatite U–Pb closure (425–530 °C) at ca. 1705 Ma. These new data show that the Wager shear zone was last active later than inferred in previous work, at a time when the western Churchill Province was undergoing lithospheric delamination and exhumation following the terminal collisional events in the western portion of the Trans-Hudson Orogen.
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Dates et versions

insu-04240554 , version 1 (13-10-2023)

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Citer

Isabelle Therriault, Kyle Larson, Holly Steenkamp, Francisco Apen, Riccardo Graziani, et al.. Characterization of the Wager shear zone, Nunavut, Canada: Insights from microstructures and geochronology. Canadian journal of earth sciences, 2023, 60 (1), pp.78-96. ⟨10.1139/cjes-2022-0031⟩. ⟨insu-04240554⟩
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