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Equilibrium Crystallization of the Plagioclase Feldspars

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Presentation on theme: "Equilibrium Crystallization of the Plagioclase Feldspars"— Presentation transcript:

1 Equilibrium Crystallization of the Plagioclase Feldspars
1. Liquid of composition X (An61) cools to the liquidus 2. Crystals of approximately An87 begin to form 3. Crystals have higher Ca/Na than liquid; ppt of crystals causes L composition to become more sodic. X 4. Ratio of Ca/Na in both crystals and liquid decrease with decreasing temperature; proportion of crystals increases as liquid decreases P=1 atm 5. Crystals of An61 cool without further change in composition Composition of 1st crystal Composition of last crystal PowerPoint® presentation by Kenneth E. Windom Composition of last liquid

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