Geodynamics of rapid voluminous felsic magmatism through time

Matthew Pankhurst, Bruce Schaefer, Peter Betts

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    44 Citations (Scopus)


    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
    Issue number1-4
    Publication statusPublished - 2011

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