Geodynamics of rapid voluminous felsic magmatism through time

Matthew Pankhurst, Bruce Schaefer, Peter Betts

    Research output: Contribution to journalArticleResearchpeer-review

    31 Citations (Scopus)

    Abstract

    Two end member geodynamic settings produce the observed examples of rapid voluminous felsic (rhyolitic) magmatism through time. The first is driven by mantle plume head arrival underneath a continent and has operated in an identifiable and regular manner since at least 2.45 Ga. This style produces high temperature ( 1.5) with high F (in thousands of parts per million) and low water content. F concentration is significant as it depolymerizes the silicate melt, influencing the magmas physical behavior during development and emplacement. These rhyolites are erupted as part of rapidly emplaced (10-15 Myr) mafic LIPs and are formed primarily by efficient assimilation-fractional crystallization processes from a mafic mantle parent. The second is driven by lithospheric extension during continental rifting or back arc evolution and is exclusive to the Phanerozoic.
    Original languageEnglish
    Pages (from-to)92 - 101
    Number of pages10
    JournalLithos
    Volume123
    Issue number1-4
    DOIs
    Publication statusPublished - 2011

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