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Rheologies of the lower continental crust and overall contrast with the underlying upper mantle likely control the evolution of first-order structures. Stress and strain partitioning between natural shear zones and wall rock(s), foliation development, flow mechanism(s) and constitutive relations of rocks that make up the lower crust are poorly known. We have undertaken an experimental study in which...
To help constrain the rheology of and strain partitioning in composite silicates from lower continental crust (LCC), opx-hbl-plag granulite samples were shortened coaxially 15-40% in a solid pressure medium (NaCl) apparatus at P c = 1.0 GPa, T = 650-950°C, and strain rates from 10 -5 to 10 -7 s -1 . The resultant mechanical behaviour and microstructures...
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