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Alkali feldspar megacryst growth: Geochemical modelling

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Summary

Alkali feldspar megacrysts from the porphyritic Karkonosze granite (Western Sudetes, Poland) were formed during magma mixing. Barium concentrations in zoned crystals, a sensitive indicator of feldspar migration between coeval magmas, serve to reconstruct the crystallization path of the megacrysts. Based on geochemical data, a double mixing model for the formation of the porphyritic granite and for megacryst growth is constructed. The feldspar growth model supports megacryst nucleation and early crystallization in a hybridized crustal magma of granodioritic composition. The growth model gives credibility of the choice of partition coefficients used in the modelling. Insights gained from mixing models based on whole rock composition and mineral zonation allow the recognition of various hybridization events that are reflected in a variety of megacryst crystallization paths within the pluton.

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  1. Institute of Geochemistry, Mineralogy and Petrology, Warsaw University, Warsaw, Poland

    E. Słaby & L. Galbarczyk-Gąsiorowska

  2. Natural History Museum, Department of Mineralogy, CERCAMS (Centre for Russian and Central EurAsian Mineral Studies), London, United Kingdom

    R. Seltmann & A. Müller

  3. Norges Geologiske Undersøkelse, Trondheim, Norway

    A. Müller

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Słaby, E., Galbarczyk-Gąsiorowska, L., Seltmann, R. et al. Alkali feldspar megacryst growth: Geochemical modelling. Mineralogy and Petrology 89, 1–29 (2007). https://doi.org/10.1007/s00710-006-0135-7

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