1. Eh Tan CIG at CIDER Workshop 2009
CIDER & Superdomes
Eh Tan
CIG
at CIDER Workshop 2009

2. Motivation: anti-correlation of V and Vs
Density
Motivation: anti-correlation of V and Vs
Suggesting high Ks material
normal Ks
Depth
high Ks

3. Density
normal Ks
high Ks
high 0
Depth

4. Density
high Ks
high 0
Depth
high Ks
high 0
high T

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

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

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

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

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

10. Composition
Temperature
Tan et al, in preparation

11. Composition
Temperature
Vs
Vp

13. 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

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

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

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

17. 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?

18. Working Group Past experience Difficulty
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?