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Concomitant skarn and syenitic magma evolution at the margins of the Zippa Mountain pluton

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Summary

Zippa Mountain pluton is a Mesozoic concentrically-zoned intrusion, located within the Canadian Cordillera of British Columbia. An extensive phase of K-feldspar bearing syenite grades towards its margins to mela-syenite and clinopyroxenite. This simple pattern of petrological zonation is overprinted by localised occurrences of silica-undersaturated, peralkaline rock types. High-purity wollastonite skarns occur within and peripheral to the intrusion and result from extensive interaction between intrusion-related fluids and Permian limestone/marble, at shallow crustal levels. Field, chemical and isotopic studies provide insights into interaction between a parental syenitic magma and these country rocks. To achieve this, petrological studies of four of the skarn bodies present have been combined with chemical and isotopic data from the pluton, and from drill core through the skarn into the pluton, to reconstruct the stages in the development of wollastonite skarn and progressive magma-country rock interaction. Derivation of peralkaline compositions from the syenitic magma requires either a loss of Si and Al, or addition of Na and/or K. Our studies preclude the addition of alkali elements but highlight extensive Si-infiltration into the limestone, while the conversion of marble to grossular-andradite skarn, indicates Al-infiltration. Fluid egress resulted in de-silicification/de-alumination of the Zippa Mountain magmas, and increased peralkalinity; wollastonite and garnet-bearing skarn formed as a by-product. Hence, the development of peralkaline rock compositions at Zippa Mountain required a parental syenitic magma, and reaction and/or interaction with calcareous country rocks.

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Authors and Affiliations

  1. Solid Earth Studies Laboratory, Department of Geology, University of Regina, Canada

    I. M. Coulson

  2. Department of Earth and Ocean Sciences, University of British Columbia, Canada

    M. Westphal

  3. Geological Survey of Canada, Vancouver, Canada

    R. G. Anderson

  4. Department of Geological Sciences and Geological Engineering, Queen’s University, Canada

    T. K. Kyser

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  1. I. M. Coulson
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  2. M. Westphal
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  3. R. G. Anderson
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  4. T. K. Kyser
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Present address: Institut für Geowissenschaften, Universität Tübingen, Tübingen, Germany

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Coulson, I., Westphal, M., Anderson, R. et al. Concomitant skarn and syenitic magma evolution at the margins of the Zippa Mountain pluton. Mineralogy and Petrology 90, 199–221 (2007). https://doi.org/10.1007/s00710-006-0178-9

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