Stanford University

Geophysics Seminar - Cailey Condit "Feedbacks Amongst Chemical and Mechanical Processes During Slow Slip: Insights from Rocks," University of Washington

When:
-
Where:
Mitchell Earth Sciences, 350/372
More Info:
Geophysics Seminar - Cailey Condit "Feedbacks Amongst Chemical and Mechanical P…
Audience:
Everyone
Sponsors:
Geophysics Department

Cailey Condit is an assistant professor at the University of Washington. Currently, Cailey's work is focused on the rheology of the subduction plate interface below and around the base of the seismogenic zone,  the deformation and rheology of Ca- and Na-amphibole, the geologic and petrologic signatures of ETS, and how the thermal structure of subduction zones influence the strength and chemical evolution of these zones.

She's also intersted in the water cycle in subduction zones (hydration, dehydratiation, transport, work etc), the geophysical signatures of various chemical and mechanical transformations, and developing new petrochronologic techniques to directly date these processes (e.g, monazite and apatite petrochronology & textural analysis).  

She also extends her work on rheology, petrology, and tectonics into continental collisional systems, working in the Precambrian rocks at the base of the Grand Canyon and SW Montana.

 

Abstract

Slow earthquakes and tectonic tremor have widely been recognized along many (warm) subduction zones both up- and down-dip of the seismogenic zone. Geophysical observations suggest these areas are fluid-rich with very low stresses during deformation. However, we still lack robust constraints on the specific processes that produce these slip phenomena. In this talk, I will present thermodynamic and rheological modelling guided by geologic observations from two exhumed subduction terranes. This analysis suggests fluids produced during dehydration of subducting crust lead to slow slip events by the activation of frictional deformation within chemically hybridized (metasomatic) rocks. The combination of chemical and mechanical transformations during subduction leads to slow slip events. 

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