High-temperature shear zone formation in Carrara marble: The effect of loading conditions
Description
One folder contains the ASCII files from four high temperature torsion deformation experiments performed with the Paterson gas apparatus in GFZ Potsdam on cylinders of Carrara marble containing single inclusions of Solnhofen limestone. The second folder contains the raw EBSD data collected on the same four samples with a a FEI Quanta 3D FEG dual beam machine equipped with an EDAX-TSL Digiview IV EBSD detector and the TSL software OIM 5.31. The experiments aimed at verifying the potential effect of different loading condition (constant stress vs constant strain rate deformation) on the amount and efficiency of ductile deformation localization in what is effectively reproducing the natural case of a homogeneus rock body containing a material heterogeneity. The results showed substantial similarity of microstructures and textures between samples deformed under different loading conditions: high temperature creep of marble is the main deformation mechanism leading to the formation of a distinct shear zone spatially associated with the presence of the limestone inclusion. Episodic brittle deformation is also present in all the samples examined. Overall, our results suggest that the loading conditions do not significantly affect strain localization induced by the presence of a material heterogeneity during nucleation and transient evolution stages.