Andesite magmas were once thought to be simple melts derived from a subducting oceanic slab or the mantle. Analysis of lavas at Mount Hood shows that instead andesites are a complex mixture of magmas formed in the continental crust just before eruption.
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Eichelberger, J. Messy magma mixtures. Nature Geosci 3, 593–594 (2010). https://doi.org/10.1038/ngeo951
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DOI: https://doi.org/10.1038/ngeo951
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