Fo Liquid EnSiO 2 X Forsterite + Enstatite Enstatite + Silica Enstatite + Liquid Forsterite + Liquid Temperature P = 1 atm 1. Cool liquid X to liquidus;

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Presentation transcript:

Fo Liquid EnSiO 2 X Forsterite + Enstatite Enstatite + Silica Enstatite + Liquid Forsterite + Liquid Temperature P = 1 atm 1. Cool liquid X to liquidus; 2. Liquid changes composition as En is removed; liquid cools to eutectic, E; silica crystallizes. 3. Temperature remains constant until liquid is completely crystallized 4. Crystalline En + silica cool P E En begins to crystallize

Fo Liquid EnSiO 2 Forsterite + Enstatite Enstatite + Silica Enstatite + Liquid Forsterite + Liquid Temperature P = 1 atm Y 1. Cool Y to liquidus; 2. Removal of Fo causes L to change composition 3. L reaches peritectic, P; Fo reacts with L to form En P E 4. Fo is consumed in reaction 5. En crystallizes as L moves to eutectic composition, E 6. En + silica crystallize at eutectic until L is consumed 7. Crystalline En + silica cool Fo crystallizes

Fo Liquid EnSiO 2 Forsterite + Enstatite Enstatite + Silica Enstatite + Liquid Forsterite + Liquid Temperature P = 1 atm 1. Cool Z to liquidus; 2. Removal of Fo causes L to change composition 3. L reaches peritectic, P; Fo reacts with L to form En P E 4. L is consumed in reaction 5. Fo + En cool Z Fo crystallizes