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Why are metamorphic rocks formed by contact metamorphism usually not as dense as those formed by regional metamorphism?

April 26, 2017contact dense formed metamorphic metamorphism Regional rocks usually

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Why are metamorphic rocks formed by contact metamorphism usually not as dense as those formed by regional metamorphism?

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Contact metamorphism does not cause profound compaction, which is the reduction in size of the spaces between mineral particles due to increases in pressure. Regional metamorphism causes compaction and possibly recrystallization, increasing the density of the rock.