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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
Strong asperities nucleate earthquakes on laboratory faults Open Access
Hematite accommodated shallow, transient Pleistocene slow slip in the exhumed southern San Andreas fault system, California, USA Available to Purchase
Hematite (U-Th)/He thermochronometry detects asperity flash heating during laboratory earthquakes Available to Purchase
The effect of cooling during deformation on recrystallized grain-size piezometry Available to Purchase
A topological model for defects and interfaces in complex crystal structures Available to Purchase
Effects of secondary phases on crystallographic preferred orientations in mylonites Available to Purchase
The role of fluid pressure on frictional behavior at the base of the seismogenic zone Available to Purchase
Rheology and Tectonic Significance of Serpentinite Available to Purchase
Syndeformational antigorite dehydration produces stable fault slip Available to Purchase
Torsion experiments on coarse-grained dunite: implications for microstructural evolution when diffusion creep is suppressed Available to Purchase
Abstract Large strain deformation experiments in torsion were conducted on a coarse-grained natural dunite with a pre-existing lattice preferred orientation (LPO). Experiments were conducted at conditions where deformation by diffusion creep is initially negligible. Microstructural evolution was studied as a function of strain. We observe that the pre-existing LPO persists to a shear strain of at least 0.5. At larger strains, this LPO is transformed. Relict deformed grains exhibit LPO with [100] crystallographic axes at high angles to the shear plane. Unlike previous experimental studies, these axes do not readily rotate into the shear plane with increasing strain. Partial dynamic recrystallization occurs in samples deformed to moderate strains ( γ >0.5). Recrystallized material forms bands that mostly transect grain interiors. The negligible rate of diffusion creep along relict grain boundaries, as well as the limited nature of dynamic recrystallization, may account for the relatively large strains required to observe evolution of microstructures. Our data support hypotheses based on natural samples that microstructures may preserve evidence of complex deformation histories. Relationships between LPO, seismic anisotropy and deformation kinematics may not always be straightforward.