Dr. Chris Gerbi: Crustal viscosity... (28-10-2016)

 

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Dr. Chris Gerbi (U. Maine)

Crustal viscosity variation in time and space

Vendredi 28 octobre 2016 à 15h / Friday, October 28, 2016, 3:00 pm

Redpath Museum Auditorium, Université McGill

Résumé / Abstract:

Patterns of viscous strength throughout the lithosphere control deformation at a wide range of scales, affecting topography, rock type distribution, mineralization, and seismic hazard. Thus, we wish to first identify the primary controls on viscous strength, then, to the extent possible, quantify the magnitudes of their effects in different settings. As has long been known, temperature is a critical factor and dominates vertically throughout much of the lithosphere. Spatial and temporal variation in rock type and mineral assemblage are significant when considering lateral, and, in places, vertical strength variation. Microstructure has the potential to play a large role, but its influence is restricted to a few tectonic environments.