Temperature 1. Cool liquid X to liquidus; En begins to crystallize

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Presentation transcript:

Temperature 1. Cool liquid X to liquidus; En begins to crystallize P = 1 atm 2. Liquid changes composition as En is removed; liquid cools to eutectic, E; silica crystallizes. Liquid Temperature 3. Temperature remains constant until liquid is completely crystallized X 4. Crystalline En + silica cool Forsterite + Liquid P E Enstatite + Liquid Forsterite + Enstatite Enstatite + Silica Fo En SiO2

Temperature 1. Cool Y to liquidus; Fo crystallizes P = 1 atm 2. Removal of Fo causes L to change composition Y Liquid 3. L reaches peritectic, P; Fo reacts with L to form En Temperature 4. Fo is consumed in reaction 5. En crystallizes as L moves to eutectic composition, E Forsterite + Liquid P E 6. En + silica crystallize at eutectic until L is consumed Enstatite + Liquid 7. Crystalline En + silica cool Forsterite + Enstatite Enstatite + Silica Fo En SiO2

Temperature Z 1. Cool Z to liquidus; P = 1 atm Fo crystallizes Liquid 2. Removal of Fo causes L to change composition Temperature 3. L reaches peritectic, P; Fo reacts with L to form En Forsterite + Liquid P 4. L is consumed in reaction E Enstatite + Liquid 5. Fo + En cool Forsterite + Enstatite Enstatite + Silica Fo En SiO2