DEFINITION OF DACITE

A fine-grained intermediate volcanic rock that is the

extrusive equivalent of granodiorite. It is similar in composition

and mineralogy to andesite, except that it has more

quartz and less calcic plagioclase than andesite. Dacites are

erupted in convergent margin settings including island arcs,

and in greater abundance in continental margin or Andeanstyle

arcs. They are typically associated with more silicic volcanic

rocks such as rhyolite.

See also CONVERGENT PLATE MARGIN PROCESSES;

IGNEOUS ROCKS.

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