Buchan metamorphic zones

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Buchan metamorphic zones Areas in which a series of mineral assemblages occur, with a biotite zone surrounded by zones of cordierite, andalusite, and sillimanite, in increasing order of metamorphic grade. The zones are named after the region of north-east Scotland (north of Aberdeen) in which they occur. Compare BARROW'S ZONES.

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Buchan metamorphic zones

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