Insights from CIDER Workshop 2009: High-Ks Superdomes and Density Correlation

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

Density high Ks high 0 Depth high Ks high 0 high T Tan and Gurnis, GRL, 2005

Composition Temperature Tan et al, in preparation

Composition Temperature Vp Vs

http://www.geodynamics.org

Conclusion • Preferred parameters for high-Ks superdomes: • KS = 6% ~ 8%,  = 2% ~ 3% at surface • KS = 6% ~ 8%,  = 0.5% ~ 1.5% at CMB pressure, normal mantle temperature • KS = 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 CMB • Not an unique dynamic interpretation of the superdomes, but the most viable one Tan and Gurnis, JGR, 2006

Speculation • Mineral physics • Fe: ~ KS, ++  • Si: ++ KS, +  • Al, Ca, Na: ??? • Superdome material: +Si, +?Fe • Original of the material? • Geochemical implication?

CIDER & Me • 2 weeks at 2004 • 1 day (Intro to CIG) at 2006 • 2 days (Geodynamics Tutorial) at 2008

CIDER Summer Workshop • Education component is very successful • we should keep doing it • Extends research component, how?

CIDER • 2+2 weeks tutorial+workshop • Inter-disciplinary collaboration during the workshop • How to sustain the collaboration beyond the workshop? • Web discussion forums? • Exchanging program?

Working Group • Past experience • several benchmarks for numerical geodynamics codes • REM • Difficulty • long term investment: >2yr • distracted by daily work • Needs a person to push the group forward • volunteer leader? • CIDER-sponsored (partially) post-doc or grad student?

Insights from CIDER Workshop 2009: High-Ks Superdomes and Density Correlation