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Contact-Style magmatic sulphide mineralisation in the Labrador Trough, northern Québec, Canada: Implications for regional prospectivity

Smith, William Daniel, Maier, Wolfgang D. and Bliss, Ian 2019. Contact-Style magmatic sulphide mineralisation in the Labrador Trough, northern Québec, Canada: Implications for regional prospectivity. Canadian Journal of Earth Sciences 10.1139/cjes-2019-0137

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Abstract

The Labrador Trough in northern Québec is currently the focus of ongoing exploration for magmatic Ni-Cu-PGE sulphide ores. This geological belt hosts voluminous basaltic sills and lavas of the Montagnais Sill Complex, which are locally emplaced amongst sulphidic metasedimentary country rocks. The recently discovered Idefix PGE-Cu prospect represents a stack of gabbroic sills that host stratiform patchy net-textured sulphides (0.2 to 0.4 g/t PGE + Au) over a thickness of ~ 20 m, for up to 7 km. In addition, globular sulphides occur at the base of the sill, adjacent to the metasedimentary floor rocks. Whole-rock and PGE geochemistry indicates that the sills share a common source and that the extracted magma underwent significant fractionation before emplacement in the upper crust. To develop the PGE-enriched ores, sulphide melt saturation was attained before final emplacement, peaking at R factors of ~ 10,000. Globular sulphides entrained along the base of the sill ingested crustally-derived arsenic and were ultimately preserved in the advancing chilled margin.

Item Type: Article
Date Type: Published Online
Status: In Press
Schools: Earth and Ocean Sciences
Publisher: NRC Research Press (Canadian Science Publishing)
ISSN: 0008-4077
Date of First Compliant Deposit: 16 December 2019
Date of Acceptance: 23 November 2019
Last Modified: 13 Mar 2020 13:51
URI: http://orca.cf.ac.uk/id/eprint/127562

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