[Geodynamics] GD1.3 EGU session invitation

[Berta Vilacís]

Dear all,

/    As the EGU session GD1.3 draws near/
/    We invite you to join us, never fear/
/    On the Earth's asthenosphere, a layer so dear/
/    Merry Christmas, happy New Year!/

/    Mark Richards is our invited speaker, he's the best/
/    He'll talk about the asthenosphere, put the rest to the test/
/    As we come together we'll learn, discuss and explore/
/    The mysteries of the Earth, and much more/

/    It's Christmas time and all is well/
/    We celebrate the Earth and all it can tell/
/    From geodynamics to plate tectonics, we'll see/
/    A holistic view of Earth and its history */

I hope you enjoy our EGU-Christmas carol, with which we would like to 
draw your attention to our EGU 2023 session, entitled - *//GD1.3: 
/Structure, chemistry and dynamics of the asthenosphere: an 
interdisciplinary look at an essential layer in Earth system./*//This 
session is being organized by Ingo Stotz, Hans-Peter Bunge, Kaj Hoernle, 
Sergei Lebedev, and myself. More info can be found here: 
https://protect-au.mimecast.com/s/6QXICvl1rKiWP3B7VsQHwzC?domain=meetingorganizer.copernicus.org 
<https://protect-au.mimecast.com/s/r6W3CwV1vMfL4WOGrIqzuuP?domain=meetingorganizer.copernicus.org> and 
the abstract is below.

Our invited speaker is Mark Richards (University of Washington).

Please consider submitting an abstract (deadline January 10th, 2023).

Best regards,
Ingo and Berta on behalf of all conveners

*Abstract:*

The asthenosphere is a crucial layer in Earth system. Its importance for 
interpreting isostasy, postglacial rebound and the seismic low velocity 
zone has long been recognized. But a string of recent results has 
highlighted its critical contribution to maintaining plate tectonics, 
enabling long distance geochemical heterogeneity transfer, inducing 
intra-plate volcanism, and influencing the pattern of upper mantle 
seismic anisotropy. A variety of inferences suggest an asthenosphere 
perhaps ~100–200 km thick with a viscosity contrast of ~100–1,000 
relative to the deeper mantle. Such a layer is most effective in 
promoting plate-like surface motions by reducing horizontal shear 
dissipation of mantle flow. Also, flow within this layer may be driven 
by the plates (Couette flow), or pressure-driven from within the mantle 
(Poiseuille flow), depending upon the degree to which plates locally 
inhibit or drive the underlying mantle. The description of asthenosphere 
flux through Poiseuille/Couette flow is particularly powerful, because 
it links mantle flow to geologic observables, such as plate motion 
changes and variations in dynamic topography. The latter are coming into 
focus through an array of innovative geologic techniques that include 
thermochronological methods, studies of river profiles, sediment 
provenance, landform analysis, or hiatus mapping at interregional and 
continental scale.

This session will provide a holistic view of the asthenosphere, its 
temporal and structural evolution, geochemical heterogeneity (as sampled 
by mid-ocean ridge volcanism, mantle xenoliths and obducted ultra-mafic 
massifs) and links to the other components of Earth system. We welcome 
contributions from seismic tomography and anisotropy, petrology and 
geochemistry, plate kinematics, thermochronological studies, structural 
geology, post glacial rebound and geodynamic models that address 
questions surrounding the asthenosphere. Studies using a 
multidisciplinary approach are particularly encouraged.

* by Ingo, Berta and openAI
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