Constraints on Mantle Composition from 1D Earth Models 2007 Vlab/EGC Workshop ESS Building SUNY Stony Brook Stony Brook, NY 11794 Baosheng Li Supported.

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Presentation transcript:

Constraints on Mantle Composition from 1D Earth Models 2007 Vlab/EGC Workshop ESS Building SUNY Stony Brook Stony Brook, NY Baosheng Li Supported by National Science Foundation

Structure of the Earth Upper mantle and Transition Zone: Low velocity zone, discontinuities; Lower Mantle: Phase transition at D” PREM Dziewonski and Anderson (1981) MantleOCIC

(Ringwood, 1975) Mineralogy and Chemical Composition Models of the Mantle

Thermoelasticity for mantle minerals/phases Mineral Assemblage in the mantle Adiabatically or isothermally raise pressure to deeper depths Mixing of all phases (VRH, HS, etc) Constraints on the Earth’s Interior: Forward Modelling

Bass and Anderson (1984) Composition: Pyrolite and Piclogite

Bass and Anderson (1984) Blue: Piclogite ; Red: Pyrolite

Comparison of the P and S wave velocities for olivine and wadsleyite at 410 km depth W. Liu, J. Kung and B. Li (GRL,2005) Duffy and Anderson (JGR, 1989)

Thermoelasticity of Mantle Minerals Stixrude and Lithgow-Bertelloni (2005)

Velocity of Mantle Minerals at Mantle Depths B. Li and R. C. Liebermann (PNAS, 2007)

Phase Fraction of Pyrolite in the Mantle Stixrude and Lithgow-Bertelloni (2005)

Phase Assemblage of Piclogite in the Mantle Stixrude and Lithgow-Bertelloni (G J I, 2005)

B. Li and R. C. Liebermann (PNAS, 2007)

Ita and Stixrude (1992) PREM Pyrolite Piclogite Blue: 1500K Red: 1600K Stixrude and Lithgow-Bertelloni (2005)

Comparison of Pyrolite with 1-D PREM/AK135 Simultaneous Vp, Vs,  comparison for tight constraints B. Li and J. Zhang (PEPI, 2005) See also Zhao&Anderson (1994), Jackson (1998) Hamma and Anderson (2002); Stacey(1996); Murakami et al(2007)