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Chemical mineralogy of some cordierite-bearing rocks near Yellowknife, Northwest Territories, Canada

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Abstract

Meta-graywacke and meta-argillite of Archean age near Yellowknife contain biotite, cordierite, gedrite and sillimanite isograds towards the Sparrow Lake granite pluton. The chemistry of biotite, cordierite, gedrite and garnet in rocks that up-grade from the cordierite isograd indicate a small range of chemical composition, particularly with reference to Mg, Fe and Mn. The analyses show further that among the coexisting ferromagnesian minerals Fe/Fe+ Mg ratio decreases in the sequence: garnet, gedrite, biotite, cordierite while Mn/Fe+Mg+Mn ratio decreases in the sequence garnet, gedrite, cordierite, biotite. The same order is also observed in the “distribution diagrams”. The regular distribution of Mg, Fe and Mn among the coexisting phases demonstrate that chemical equilibrium was attained and preserved in these Archean rocks. Mg-Fe distribution between cordierite and biotite appears to be dependent on the temperature of crystallization or metamorphic grade.

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  1. D. C. Kamineni

    Present address: Dept. of Geology, National University, P.O. Box 1124, Kuala Lumpur, Malaysia

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  1. Dept. of Geology, University of Ottawa, Ottawa, Canada

    D. C. Kamineni

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Kamineni, D.C. Chemical mineralogy of some cordierite-bearing rocks near Yellowknife, Northwest Territories, Canada. Contr. Mineral. and Petrol. 53, 293–310 (1975). https://doi.org/10.1007/BF00382445

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  • DOI: https://doi.org/10.1007/BF00382445

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