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

Isabelle Therriault, Kyle P. Larson, Holly M. Steenkamp, Francisco E. Apen, Riccardo Graziani, Mathieu Soret, Carl Guilmette, John M. Cottle

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

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 (425–530C) 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.

Original languageEnglish (US)
Pages (from-to)78-96
Number of pages19
JournalCanadian Journal of Earth Sciences
Volume60
Issue number1
DOIs
StatePublished - 2022
Externally publishedYes

Keywords

  • apatite
  • shear zone
  • titanite
  • Trans-Hudson Orogen
  • U–Pb geochronology
  • Zr-in-titanite geothermometry

ASJC Scopus subject areas

  • General Earth and Planetary Sciences

Fingerprint

Dive into the research topics of 'Characterization of the Wager shear zone, Nunavut, Canada: Insights from microstructures and geochronology'. Together they form a unique fingerprint.

Cite this