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SUMMARY:Using numerical models of whole-mantle convection to unravel mantl
 e-lithosphere interactions.  - Maelis Arnould\, University of Lyon
DTSTART:20230308T160000Z
DTEND:20230308T170000Z
UID:TALK197998@talks.cam.ac.uk
CONTACT:Megan Holdt
DESCRIPTION:Earth’s lithospheric behavior notably depends on its mantle 
 properties and dynamics. Therefore\, in order to fully understand Earth’
 s present-day or geological observations such as hotspot magmatism\, surfa
 ce tectonic motions\, dynamic topography\, it is often important to consid
 er the interactions between Earth’s mantle and lithosphere. However\, th
 e nature and effects of the diverse interactions between Earth’s surface
  and mantle is still debated.\n\nHere\, I propose to use both 2D and 3D-sp
 herical numerical models of whole-mantle convection self-generating plate-
 like tectonics at the surface in order to revisit and explain a diverse se
 t of geological observations\, and unravel mantle properties and dynamics.
  In the first part of my talk\, I will demonstrate that model plume-lithos
 phere interactions can provide geodynamical constraints for paleogeographi
 c reconstructions. In the second part of my presentation\, I will show\, u
 sing both models with a linear and a composite mantle rheology\, how upper
 -mantle properties can control lithosphere dynamics\, either favouring pla
 te tectonics\, or switching it off completely. I will briefly discuss how 
 these results can be used in order to better constrain Earth’s mantle rh
 eology. 
LOCATION:Wolfson Lecture Theatre
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