Geochemistry of bimodal basalt-subalkaline/peralkaline rhyolite provinces within the southern British Caledonides.

P. T. Leat, S. E. Jackson, R. S. Thorpe, C. J. Stillman

    Research output: Contribution to journalArticle

    142 Citations (Scopus)

    Abstract

    At Parys Mountain, Snowdonia and Avoca, bimodal associations of Upper Ordovician basalt and rhyolite with a submarine origin occur within the Caledonian orogenic belt. The rocks have undergone hydrothermal alteration and low-grade metamorphism. The basalts are transitional between volcanic arc and within-plate types; one group of rhyolites (low Zr) is originally of high-K, subalkaline type, the other (high Zr) originally peralkaline. The evidence suggests magma production in a complex tectonic setting, transitional between an active continental margin/island arc and an extensional environment. Associated sulphide mineralization is volcanogenic and probably synsedimentary, the convecting fluids probably driven by high-level rhyolitic magma chambers.-R.E.S.

    Original languageEnglish
    Pages (from-to)259-273
    Number of pages15
    JournalJournal of the Geological Society
    Volume143
    Issue number2
    Publication statusPublished - 1986

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