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Timing of sediment-hosted Cu-Ag mineralization in the Trans-Hudson orogen at Janice Lake, Wollaston Domain, Saskatchewan, Canada

  • José Perelló
  • Víctor A. Valencia
  • Paula Cornejo
  • John Clifford
  • Alan J. Wilson
  • Greg Collins
Article

Abstract

The Janice Lake Cu-Ag mineralization in the Wollaston Domain of northern Saskatchewan is hosted by a metasedimentary sequence in the upper part of the Wollaston Supergroup of the Trans-Hudson orogen. The Wollaston Supergroup was deposited between ~ 2070 and 1865 Ma in a foreland basin setting constructed over Archean basement of the Hearne craton. The Trans-Hudson orogen underwent final collision and peak metamorphism at ~ 1810 Ma, during consolidation of Laurentia and its amalgamation with the Columbia supercontinent. Titanite is a common constituent of the post-peak metamorphic assemblages of Trans-Hudson lithotectonic units and accompanied disseminated sediment-hosted Cu sulfide mineralization at Janice Lake. Titanite crystals, intergrown with chalcocite over a strike-length of ~ 2 km of Cu-bearing stratigraphy, were dated by the ID-TIMS and LA-ICP-MS U-Pb methods, returning an age range from 1780 to 1760 Ma and a weighted average age of 1775 ± 10 Ma. The titanite ages effectively date the associated chalcocite-dominated sediment-hosted Cu-Ag mineralization and its formation during initial post-orogenic uplift and cooling, ~ 30 myr after peak metamorphism. The age-range and tectonic setting of the Janice Lake mineralization confirms that sediment-hosted Cu mineralization was an integral part of the metallogenic endowment of Columbia and that its emplacement coincided with the continental-scale Trans-Hudson orogeny rather than with diagenesis and extensional basin development ~ 100 myr earlier.

Keywords

Sediment-hosted Cu mineralization Trans-Hudson orogen Wollaston Supergroup Janice Lake Titanite ages Post-peak metamorphism 

Notes

Acknowledgments

We thank Natalie Thompson for her assistance during work at the core library of the Saskatchewan Precambrian Geological Laboratory, La Ronge, Saskatchewan, Terry Blackburn for assistance with ID-TIMS dating, and Héctor Poblete for figure drafting. Antofagasta Minerals S.A. funded the analytical work and Transition Metals Corporation provided in-kind support at La Ronge. The manuscript benefited from reviews by Richard Sillitoe and Thomas Hart. Gary Delaney and Armin Zeh conducted formal reviews on behalf of Mineralium Deposita.

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Authors and Affiliations

  1. 1.Antofagasta Minerals S.A.SantiagoChile
  2. 2.School of the EnvironmentWashington State UniversityPullmanUSA
  3. 3.Antofagasta Minerals CanadaTorontoCanada
  4. 4.Transition Metals CorporationSudburyCanada

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