cider & superdomes
DESCRIPTION
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 PresentationTRANSCRIPT
CIDER & Superdomes
Eh TanCIG
at CIDER Workshop 2009
DensityD
epth
normal Ks
high Ks
• Motivation: anti-correlation of V and Vs
• Suggesting high Ks material
DensityD
epth
normal Ks
high Kshigh 0
DensityD
epth high Ks
high 0
high Kshigh 0
high T
DensityD
epth high Ks
high 0
high Kshigh 0
high T
Tan and Gurnis, GRL, 2005
DensityD
epth high Ks
high 0
high Kshigh 0
high T
Tan and Gurnis, GRL, 2005
DensityD
epth high Ks
high 0
high Kshigh 0
high T
Tan and Gurnis, GRL, 2005
DensityD
epth high Ks
high 0
high Kshigh 0
high T
Tan and Gurnis, GRL, 2005
DensityD
epth high Ks
high 0
high Kshigh 0
high T
Tan and Gurnis, GRL, 2005
Composition Temperature
Tan et al, in preparation
Composition Temperature
VpVs
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?