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Unformatted text preview: (2). Assume the melt flows into a new magma chamber after exactly half of the solid has melted. What is the composition of this melt? What is the composition of the first solid to crystallize from this new melt? What is the composition of the crystals once the entire magma chamber has crystallized? What is the temperature when the final melt crystallizes? (3) Assume you have an alkali feldspar with a composition of Ab 70 At what temperature does exsolution start? At 400 degrees, what are the compositions of the two exsolution minerals? At 400 degrees, what are the percentage fractions of the two minerals that have exsolved? 1...
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 Spring '11
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