[iris-bulk] IGC Session

[alan at rice.edu]

We'd like to call your attention to the following session at the 
International Geological Congress, August 6-14, 2008, Oslo, Norway.


Title: Geophysical evidence for mantle heterogeneity
Convener:
Co-convenors:
R. van der Hilst (hilst at mit.edu)
H. Thybo (thybo at geol.ku.dk)
A. Levander (alan at rice.edu)



Significant mantle heterogeneity has been documented on all scale 
lengths, primarily by application of seismological methods, but also 
in exposures of upper mantle rocks. Recent studies provide new 
insight into the origin of the heterogeniety by use of a variety of 
methods. Seismic tomography very early demonstrated significant long 
wavelength heterogeniety, which has been interpreted successfully in 
terms of subduction and plume structure. In places controlled source 
seismological methods have further increased the resolution of 
heterogeneity in the upper mantle, and recently receiver function and 
other direct imaging techniques have proven promising for 
improvements in resolution.  High resolution teleseismic migration 
methods have shown that certain depth intervals may be very 
heterogeneous, in particular the lithosphere and the D'' region at 
the base of the mantle. There is considerable debate on the origin of 
the mantle heterogeneity in terms of chemical-mineralogical 
variations and physical properties.

We invite contributions on documentation and interpretation of mantle 
heterogeneity at any scale length, from outcrop to global, and 
particularly encourage contributions that relate seismic velocity to 
thermal state or chemical/mineralogical variation.

-- 
Alan Levander
Carey Croneis Professor and Chair

Department of Earth Science
Rice University
6100 Main Street
Houston, TX  77005

713-348-6064
713-348-5214 Fax

http://earthscience.rice.edu
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