Phase diagrams for melting in the Earth (101): thermodynamic fundamentals Jan Matas Université de Lyon Ecole normale supérieure de Lyon, CNRS CIDER 2010.

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Presentation transcript:

Phase diagrams for melting in the Earth (101): thermodynamic fundamentals Jan Matas Université de Lyon Ecole normale supérieure de Lyon, CNRS CIDER 2010

Outer Core Mantle Continental Crust Base of lithosphere Oceanic Crust Ocean Plume Mid- ocean Ridge Inner core solidification (cf Jie Li) Basal magma ocean Labrosse et al Metling in the Earth Jie Li (CIDER 2010)

Pyroxene (Ca,Mg,Fe)(Mg,Fe,Al)(Al,Si) 2 O 6 Olivine (Mg,Fe) 2 SiO 4 Garnet (Ca,Mg,Fe) 3 (Mg,Fe,Al,Si) 2 (Al,Si) 3 O 12 Natural samples: e.g. peridotite

Natural samples: e.g. pallasite metallic alloy (Fe, Ni, Si, S,...) olivine (Mg,Fe) 2 SiO 4

Natural samples - global composition: Mg, Fe, Al, Ca, Si, Ni, S, O,... - macro-scale: assemblage of grains (each grain is a mineral) - micro-scale: each grain = (solid) solution a thermodynamic description requires end-members E.g.: (Mg x,Fe y ) 2 SiO 4 = xMg 2 SiO 4 + yFe 2 SiO 4

Temperature ( o C) Wt. % Fayalite Fe 2 SiO 4 Mg 2 SiO L1 L2 L3 S1 S2 S3 LIQUID OLIVINE 1 atm = 0.1 MPa liquidus solidus X0X0 X1X1 X2X2 X3X3 “forbidden zone” T1 T2T2 T3 Temperature ( o C) Diopside CaMgSi 2 O 6 Anorthite CaAl 2 Si 2 O 8 1 atm = 0.1 MPa LIQUID Anorthite + Diopside X (Wt. %) solidus liquidus L1 L3 L2 S1 S2 S3 X0X0 x1x1 x2x2 x3x3 T1 T3 T2 Eutectic Two diagrams, same thermodynamics Loop diagram Eutectic diagram cf … Cin-Ty Lee

Solid L+S Liquid A1A2 Temperature Composition A1A1 A1A1 Rabbit diagram

Ideal mixture: G*(mix)

BB AA xBxB AA BB Ideal mixing G*

A1A1 T P P3P3 P2P2 P1P1 P T X1X1 X2X2 X3X3

P P P X1X1 X3X3 X2X2 T T T solid liquid solid liquid s+l

Non-ideal mixing G*mix+G*ex W negative W positive

BB AA Non-ideal mixture G* inflection point

 B1 =  B2  A1 =  A2 x B1 x B2 Non-ideal mixture G* inflection point

BB AA Non-ideal mixture G* inflection point TT xBxB

A1A1 A2A2 TCTC Temperature Composition Single mixture (A x B 1-x ) two coexisting phases (A x1 B 1-x1 ) et (A x2 B 1-x2 ) A B xx1 x2 stableinstable

Liquid Solid L+S A1A2 B1B2 Temperature Composition A1A1 A A1A1 B A1A1 A’ A1A1 B’

Solid L+S Liquid A1A2 B1B2 Temperature Composition A1A1 A A1A1 B A1A1 A’ A1A1 B’

Solid L+S Liquid A1A2 B1B2 Temperature Composition A1A1 A A1A1 B A1A1 A’ A1A1 B’ Azeotropic minimum

Solid L+S Liquid A1A2 B1B2 Temperature Composition A1A1 A A1A1 B A1A1 A’ A1A1 B’

Liquid Solid L+S A1A2 B1B2 E Temperature Composition A1A1 A A1A1 B A1A1 A’ A1A1 B’

Gasparik

solidus Peritectic (Opx -> Cpx) Azeotropic minimu

Peritectic becomes eutectique

Evolution at the solidus