Abstract

Aluminous pelitic rocks of the Late Precambrian Horsethief Creek Group of southeastern British Columbia contain the assemblage chloritoidmuscovite-paragonite-quartz-chlorite (biotite zone). Additional members of the assemblage may include graphite, Fe-Mg carbonate, rutile, ilmenite and pyrite. No albite was detected. Lower grade pelitic rocks (chlorite zone) contain muscovite-chlorite and rare paragonite.

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