Earthquakes as Precursors of Ductile Shear Zones in the Dry and Strong Lower Crust

• Published in: Geochemistry, Geophysics, Geosystems
• Main Authors: Menegon, L., Pennacchioni, G., Malaspina, N., Harris, K., Wood, E.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Blackwell Publishing Ltd 2017
• Subjects: deformation mechanism; grain-size sensitive creep; Lofoten; lower crustal earthquake; pseudotachylyte; shear zone; Geophysic; Geochemistry and Petrology; Norway; Nusfjord
• Online Access: http://hdl.handle.net/11577/3258747; https://doi.org/10.1002/2017GC007189; http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1525-2027

The rheology and the conditions for viscous flow of the dry granulite facies lower crust are still poorly understood. Viscous shearing in the dry and strong lower crust commonly localizes in pseudotachylyte veins, but the deformation mechanisms responsible for the weakening and viscous shear localiz...