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Information - GD04 Geophysical and Geochemical Views of the Lithosphere - Asthenosphere Interaction (co-sponsored by International Lithosphere Programme Task Force III, co-listed in SM & GMPV)
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Event Information |
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Although plate tectonics are the major surface expression of mantle convection, many aspects of the interaction between lithospheric plates and the underlying convecting mantle remain poorly understood. The complex rheological processes that allow the lithosphere to have a plate-like behavior are very difficult to constrain geologically, to study in the laboratory, and model mathematically. The sinking of old, cold oceanic plates into the convecting mantle is probably the most easily understood evidence of plate-mantle interaction. Yet the initiation of subduction and the actual mantle flow in the vicinity of a subducting slab are far less understood, just like the processes allowing the rifting of a thick continental plate or the long-term stability or erosion of a cratonic root.
New insights into these issues rely on a better understanding of the physico-chemical interactions at the lithosphere-asthenosphere boundary. In the last years, significant advances on our understanding of this interaction have been made possible thanks to advances in geodynamical modeling, the probing of mantle structure deformation using seismic and magnetotelluric data, new experiments on the deformation of mantle rocks, and petrological and geochemical studies on magmas and mantle rocks leading to a better understanding of the physics of melt transport and melt-rock interaction.
The aim of this multidisciplinary session is to build a comprehensive picture of the physico-chemical processes involved in the lithosphere-asthenosphere interactions in a large variety of geodynamic environments. We welcome contributions in geodynamics, geochemistry, petrology, tectonics, mineral physics, seismology, and magnetotellurics studies, which convey new constraints and/or apply new techniques to unravel these interactions in different tectonic settings.
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