BLUESCHIST Definition & Meaning

blueschist

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A bluish schist that gets its color from the presence of a sodic amphibolite, glaucophane, or a variety of glaucophane called crossite. Blueschist forms under conditions of high pressure but low temperature, as at the boundaries of converging tectonic plates.

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Examples have not been reviewed.

As evidence of the youthfulness of the plate regimen, Dr. Stern points to two classes of rocks: ophiolites and blueschist.

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“Revised ages of blueschist metamorphism and the youngest pre-thrusting rocks in the San Juan Islands, Washington.”

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