cider & superdomes

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CIDER & Superdomes. Eh Tan CIG at CIDER Workshop 2009. Density. Motivation: anti-correlation of  V  and  Vs Suggesting high Ks material. normal Ks. Depth. high Ks. Density. normal Ks. high Ks high  0. Depth. Density. high Ks high  0. Depth. high Ks high  0 high T. - PowerPoint PPT Presentation

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  • CIDER & SuperdomesEh TanCIGat CIDER Workshop 2009

  • DensityDepthnormal Kshigh KsMotivation: anti-correlation of V and VsSuggesting high Ks material

  • DensityDepthnormal Kshigh Kshigh 0

  • DensityDepthhigh Kshigh 0high Kshigh 0high T

  • DensityDepthhigh Kshigh 0high Kshigh 0high TTan and Gurnis, GRL, 2005

  • DensityDepthhigh Kshigh 0high Kshigh 0high TTan and Gurnis, GRL, 2005

  • DensityDepthhigh Kshigh 0high Kshigh 0high TTan and Gurnis, GRL, 2005

  • DensityDepthhigh Kshigh 0high Kshigh 0high TTan and Gurnis, GRL, 2005

  • DensityDepthhigh Kshigh 0high Kshigh 0high TTan and Gurnis, GRL, 2005

  • CompositionTemperatureTan et al, in preparation

  • CompositionTemperatureVpVs

  • http://www.geodynamics.org

  • ConclusionPreferred parameters for high-Ks superdomes:KS = 6% ~ 8%, = 2% ~ 3% at surfaceKS = 6% ~ 8%, = 0.5% ~ 1.5% at CMB pressure, normal mantle temperatureKS = 1% ~ 2%, = -0.5% ~ 0.5% at CMB pressure, elevated temperature (+ 500K ~ 1000K)depends on the thermal expansion, viscosity contrast, and the temperature of the mantle and CMBNot an unique dynamic interpretation of the superdomes, but the most viable oneTan and Gurnis, JGR, 2006

  • SpeculationMineral physicsFe: ~ KS, ++ Si: ++ KS, + Al, Ca, Na: ???Superdome material: +Si, +?FeOriginal of the material?Geochemical implication?

  • CIDER & Me2 weeks at 20041 day (Intro to CIG) at 20062 days (Geodynamics Tutorial) at 2008

  • CIDER Summer WorkshopEducation component is very successfulwe should keep doing itExtends research component, how?

  • CIDER2+2 weeks tutorial+workshopInter-disciplinary collaboration during the workshopHow to sustain the collaboration beyond the workshop?Web discussion forums?Exchanging program?

  • Working GroupPast experienceseveral benchmarks for numerical geodynamics codesREMDifficultylong term investment: >2yrdistracted by daily workNeeds a person to push the group forwardvolunteer leader?CIDER-sponsored (partially) post-doc or grad student?

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