Zooming into the subduction plate interface: constraints from petrology, geodynamics and modelling

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• Philippe Agard, University Paris VI
• Tuesday 08 November 2011, 16:30-17:30
• Harker 1 seminar room, Department of Earth Sciences.

If you have a question about this talk, please contact John Maclennan.

Brief summary: Subduction zones are crucial areas for understanding lithospheric-scale coupling between plates, risk assessment, or vertical movements and material recycling on Earth. In recent years a wealth of geophysical (low-velocity layers on top of most subducting slabs, partly serpentinized mantle wedge tips, ETS and fluid release…) and petrological data (including detailed T-depth-time-fluid evolutions) were gathered and, together with increasingly detailed thermomechanical models, shed light on subduction dynamics and exhumation models. Yet, in detail, the nature and structure of the subduction interface are still poorly constrained: e.g., which lithologies and mixed to which extent? which rheologies? which fluids and where? what is their exact bearing on earthquake ruptures? etc… I herein focus on showing how the fate of oceanic crustal slices along the subduction interface provides further insights into interplate mechanical coupling and element transfer in subduction zones.

This talk is part of the Department of Earth Sciences Seminars (downtown) series.

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• Department of Earth Sciences Seminars (downtown)
• Department of Earth Sciences seminars
• Harker 1 seminar room, Department of Earth Sciences
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