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rhyolitic magma

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rhyolitic magma [¦rī·ə¦lid·ik ′mag·mə]
(petrology)
A type of magma formed by differentiation from basaltic magma in combination with assimilation of siliceous material, or by melting of portions of the earth's sialic layer.


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So, many authors consider it unlikely that such a process could, by itself, yield the vast volumes of andesitic and rhyolitic magmas that occur in matute arcs, even if magnetite were to appear on the liquidus to subdue iron enrichment trends.
Only a few weight percent of water are required to make exsolution of water from a rhyolitic magma an instantaneous process (Fig.
 
 
 
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