Lecture 8 Ternary Phase-1

Lecture 8 Ternary Phase-1 - Ternary Phase Diagrams M T GEOL...

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T M Forsterite Forsterite Diopside Diopside GEOL 320 -- Petrology Ternary Phase Diagrams
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C = 3: Ternary Systems: C = 3: Ternary Systems: Example 1: Ternary Eutectic Example 1: Ternary Eutectic Di - An - Fo Di - An - Fo T M Anorthite Anorthite Forsterite Forsterite Diopside Diopside Note three binary Note three binary eutectics eutectics No solid solution No solid solution Ternary eutectic = M Ternary eutectic = M
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CRYSTALLIZATION T - X Projection of Di - An - Fo Binary eutectics Ternary eutectic Cotectic lines An 1553 1890 Fo Di 1270 1274 1392 1387 Figure 7-2. Isobaric diagram illustrating the liquidus temperatures in the Di-An-Fo system at atmospheric pressure (0.1 MPa). After Bowen (1915), A. J. Sci., and Morse (1994), Basalts and and Phase Diagrams. Krieger Publishers. Publishers.
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Crystallization Relationships An 1553 1890 Fo Di 1270 1274 1392 1397 a CRYSTALLIZATION
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CRYSTALLIZATION Pure Fo forms Pure Fo forms Just as in Just as in binary binary Φ Φ = ? = ? F = ? F = ? An 1553 1890 Fo Di 1270 1274 1392 1397 a Fo + Liq Liquid Di + Liq Di+Fo a Fo
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CRYSTALLIZATION An 1553 1890 Fo Di 1270 1274 1392 1397 a Φ = 2 (Fo + Liq) F = 3 - 2 + 1 = 2 If on liquidus, need to specify only 2 intensive variables to determine the system T and or and X of pure Fo is fixed X An liq X An liq X Fo liq
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CRYSTALLIZATION An 1553 1890 Fo Di 1270 1274 1392 1387 b x Fo crystallizes Loss of Fo component X liq moves directly away from Fo corner toward cotectic Liq A → Liq B + Fo
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CRYSTALLIZATION
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Lecture 8 Ternary Phase-1 - Ternary Phase Diagrams M T GEOL...

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