[iris-bulk] (IGC) lithosphere-asthenosphere boundary at the 33rd IGC

[IRIS]

We are convening a session (EIL-03) about the nature of the  
lithosphere-asthenosphere boundary (see description below) for the  
33rd IGC in Oslo, 6-14 Aug 2008 .  We encourage you to submit an  
abstract if you are interested in lithosphere formation and evolution,  
constraining the depth extent and composition of the lithosphere, the  
lithosphere asthenosphere boundary, lithosphere/asthenosphere  
interaction, seismic tomography of the upper mantle, and/or  
asthenospheric flow and dynamics.


Session EIL-03
The Lithosphere - Asthenosphere boundary: nature, formation and  
evolution from Hadean to now.

The nature of the Lithosphere-Asthenosphere boundary is critical to    
our understanding of the geodynamic and geochemical evolution of  
Earth, yet its definition is still controversial. Advances in seismic  
tomography and potential-field analysis are providing imagery of the  
present-day subcontinental lithosphere, to depths of several hundred  
kilometers (and beyond).  Seismic discontinuity studies increasingly  
address the sharpness, velocity jump, depth and nature of the  
lithosphere-asthenosphere boundary. Geochemical  analysis of  
xenolithic material from the upper mantle and lower  crust is  
providing increasingly sophisticated data on the  compositional and  
thermal structure of this lithosphere, as sampled by volcanic  
eruptions through time.  The geochemistry of primitive magmas tells  
about the changing composition, temperature and thus rheological  
behaviour of the convecting mantle.  Numerical modelling of dynamic  
processes in the Earth can investigate how the lithosphere an!
d underlying mantle have behaved through time in response to changing  
thermal and tectonic regimes. In this Symposium we aim bring together  
experts in all these disciplines, in an attempt to integrate the  
different types of data, and to discuss the constraints that help us  
elucidate what the character and location of the Lithosphere- 
Asthenosphere in the present-day and older Earth.

Conveners: Suzanne O'Reilly, Juan Carlos Afonso, Suzan van der Lee
We site: http://www.33igc.org/coco
Abstract deadline: 29 February 2008.
Note:  This Session will be in the first week of the IGC so that  
participants can also attend the 9th Kimberlite conference in  
Frankfurt where there will be some sessions with similar topics


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