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
- Composition, Crystal, Feldspar, Crystallization, final melt crystallizes