Granitic melt viscosity and silicic magma dynamics in contrasting tectonic settings

J. D. Clemens*, N. Petford

*Corresponding author for this work

    Research output: Contribution to journalArticle

    91 Citations (Scopus)

    Abstract

    Models for granitic melt viscosities reveal the influences of H2O, temperature and tectonics on melt segregation, ascent and emplacement. Low-T magmas are wetter than those formed at high-T, so log10 melt viscosity (Pa s) is 3.2-6.3 for leucogranite to tonalite, only 10-1000 times more viscous than basalts. There should be no correlation between critical dyke width (to prevent freezing) and tectonic setting. Granitic magma ascent rates in dykes vary by <10%, and melt extraction rates should be similar in different settings. Emplacement styles are not predetermined by composition or temperature, but by local structures and tectonics.

    Original languageEnglish
    Pages (from-to)1057-1060
    Number of pages4
    JournalJournal of the Geological Society
    Volume156
    Issue number6
    DOIs
    Publication statusPublished - Nov 1999

    Keywords

    • Granites
    • Melts
    • Viscosity

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