Question: TEMPERATURE (in C) 1. Using the plagioclase phase diagram (below), please answer the following questions. Assume equilibrium crystallization and a starting composition of An60Ab40

TEMPERATURE (in C) 1. Using the plagioclase phase diagram (below), please answer the following questions. Assume equilibrium crystallization and a starting composition of An60Ab40 A. At what temperature (round to the nearest 10 degrees) will plagioclase first being to crystallize? What will be the composition of the crystals at this temperature? B. What will the compositions of the liquid and co-existing crystals be at 1400C? C. What is the lowest temperature that liquid will be present? 1500- 14001 1300- 1200 Albite melting 1100 All Liquid Anorthite melting Liquid and Crystal All Crystal 0 Albite 10 20 30 oligoclase 40 50 anderine 60 70 80 labradorite bylounle 90 100 Anorthite NAISL COMPOSITION (Weight % Calcium) CaAl, SQ

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Analysis of the Plagioclase Phase Diagram Given Starting Composition An 60 60 60Ab 40 40 40 A At what temperature will plagioclase first begin to crys... View full answer

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