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Plagiogranite

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Colour image of gray rock with small black and white spots
Plagiogranite. Belledune. Collector: unknown. New Brunswick Museum (NBMR 1810). Specimen width 22 cm. Plagiogranite or tonalite is created as subducting ocean crust melts and separates into heavier and lighter fractions. Plagiogranite represents the light fraction of the melt that rises to the surface above subduction zones.