Origin of pyroxene-plagioclase aggregates in a rhyodacite

R. H. Flood*, R. H. Vernon, S. E. Shaw, B. W. Chappell

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    14 Citations (Scopus)


    Bodies of pyroxene-bearing rhyodacite in New England, New South Wales, previously considered to be intrusions, are reinterpreted as ignimbritic flows. Small aggregates of pyroxene and plagioclase are inferred to be either compositionally modified crystalline residuals from partial melting or crystal cumulates. An earlier hypothesis involving mixing of solid biotite-diorite with a rhyolitic liquid is questionable, and the origin of the rhyodacite can be explained in terms of recent experimental work on crystal-liquid equilibria under inferred crustal conditions.

    Original languageEnglish
    Pages (from-to)299-309
    Number of pages11
    JournalContributions to Mineralogy and Petrology
    Issue number3
    Publication statusPublished - Oct 1977


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