GD2.3/SM6.8Lithosphere-asthenosphere interplay, deformation and dynamics (co-organized)
|Convener: Ehsan Qorbani | Co-Conveners: Irene Bianchi , Boris Kaus , Ernst Willingshofer , Sarah Brownlee , Andrea Tommasi|
Knowledge of the lithosphere-asthenosphere system and its dynamics is one of the key questions for understanding geological processes. Constraints on the style, mechanism, and pattern of deformation in the upper mantle come from direct and indirect observations using a variety of methods. Seismological studies focused on anisotropy have successfully improved our knowledge of deformation patterns, and when combined with tomographic models, anisotropy can shed light on the geometry of deformation in the lithosphere and asthenosphere. Sophisticated geodynamical modeling (numerical and physical analogue) and laboratory (rock physics) experiments enhance our understanding of flow patterns in the Earth’s upper mantle; combined with seismic anisotropy data these methods have the potential to reveal the mechanisms that create deformation-induced features such as shape preferred orientation (SPO) and lattice-preferred orientation (LPO). Additionally, physical analogue and numerical modeling studies have fostered our understanding of complex 3D-plate interaction on various time-scales, regulated through the degree of plate coupling and the rheology of the lithosphere.
However, more work is required to better integrate the various techniques and observations. This session will bring together different disciplines that focus on the deformation of the lithosphere and upper mantle as well as on the dynamics and nature of the lithosphere-asthenosphere system. The main goal is to demonstrate the potential of different methods, and to share ideas of how we can collaboratively study lithospheric deformation, and how it relates to the ongoing dynamics within the asthenospheric mantle. Contributions are sought from studies employing seismic observation, geodynamical modeling (analogue and numerical), and mineral and rock physics.
Barbara Romanowicz (University of California, Berkeley)
Jordi Díaz (Institute of Earth Sciences Jaume Almera, Barcelona)