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Phase Diagrams Continued

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Presentation on theme: "Phase Diagrams Continued"— Presentation transcript:

1 Phase Diagrams Continued
1557 Mg2SiO4 20 40 60 80 SiO2 1400 1600 1800 2000 1713 T oC MgSiO2 1543 1470 Forsterite + Enstatite Liquid + 1695 Enstatite + Tridymite Enstatite + Cristobalite Cristobalite + Liquid Two Liquids Liquid Wt.% X2 o n c p T M Anorthite Forsterite

2 Updates/questions Next week Review and Midterm Topics: phase diagrams
2 component systems: Peritectic 3 component systems

3 Solid Solution with Eutectic: Ab-Or (the alkali feldspars)
Figure T-X phase diagram of the system albite-orthoclase at 0.2 GPa H2O pressure. After Bowen and Tuttle (1950). J. Geology.

4

5 Effect of PH O on Ab-Or 2 Figure The Albite-K-feldspar system at various H2O pressures. (a) and (b) after Bowen and Tuttle (1950), J. Geol, (c) after Morse (1970) J. Petrol.

6 Binary Peritectic Systems
1557 Mg2SiO4 20 40 60 80 SiO2 1400 1600 1800 2000 1713 T oC MgSiO2 1543 1470 Enstatite Forsterite + Enstatite Liquid + 1695 Enstatite + Tridymite Enstatite + Cristobalite Cristobalite + Liquid Two Liquids Liquid Wt.% X2 b e a Figure Isobaric T-X phase diagram of the system Fo-Silica at 0.1 MPa. After Bowen and Anderson (1914) and Grieg (1927). Amer. J. Sci.

7 The Peritectic 1: X between Fo-En
d i k m Fo En 1557 Bulk X

8 Olivine with orthopyroxene rims, Mt McLoughlin, OR

9 The Peritectic 2: X between En-Cr
1543 c d i k m Fo En 1557 bulk X x y Cr

10 Incongruent Melting of Enstatite
1543 c d i Fo En 1557 bulk X Cr

11

12

13

14 Ternary Systems

15 C = 3: Ternary Systems: Example 1: Ternary Eutectic Di - An - Fo
Anorthite M T Forsterite Diopside

16 Crystallization Relationships
Cool composition a from 2000oC At 2000oC: phi = ? (1 (liquid) F = ? F = C - f = = 3 = T, X(An)Liq, X(Di)Liq, and X(Fo)Liq only 2 of 3 X’s are independent Next cool to 1700oC Intersect liquidus surface What happens??

17 Pure Fo forms Just as in binary f = ? F = ? a Liquid An Fo + Liq
Di + Liq Di + Fo a An Pure Fo forms Just as in binary f = ? F = ?

18

19 Liq/total solids = a-m/Liq-a total Di/Fo = m-Fo/Di-m
Ternary lever w/ 3 phases Imagine triangular plane X - Di - Fo balanced on bulk a Liq x a Di m Fo Liq/total solids = a-m/Liq-a total Di/Fo = m-Fo/Di-m

20 Pressure Effects

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