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What are the two differences in the chemical composition of rhyolitic and basaltic magmas?

User Luke Mills
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As seen in the diagram, magmas that are rhyolite in composition have higher Al, Na, and SiO2 and lower Fe, Mg, and Ca content. Whereas basaltic magmas have higher Fe, Mg, and Ca and lower SiO2, Al, and Na. Also of note, is the total amount of dissolved gasses that are trapped within the magma.
User Paul Preney
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