Dataset
Data Publication
Mechanical data and microstructures of simulated calcite fault gouge sheared at 550°C
Verberne, Berend Antonie | Chen, Jianye | Pennock, Gillian
GFZ Data Services
(2017)
Descriptions
The largest magnitude earthquakes nucleate at depths near the base of the seismogenic zone, near the transition from velocity weakening frictional slip to velocity strengthening ductile flow. However, the mechanisms controlling this transition, and relevant to earthquake nucleation, remain poorly understood. Here we present data from experiments investigating the effect of slip rate on the mechanical properties and microstructure development of simulated calcite fault gouge sheared at ~550°C, close to the transition from (unstable) velocity weakening to (stable) velocity strengthening behaviour, reported by Verberne et al. (2015). We conducted experiments at a constant effective normal stress (σneff) of 50 MPa, as well as σneff-stepping tests employing 20 MPa ≤ σneff ≤ 140 MPa, at constant sliding velocities (v) of 0.1, 1, 10, or 100 µm/s. Samples sheared at v ≥ 1 µm/s showed a microstructure characterized by a single, 30 to 40 μm wide boundary shear, as well as a linear correlation of shear strength (τ) with σneff. Remarkably, electron backscatter diffraction mapping of polygonal shear band grains demonstrated a crystallographic preferred orientation. By contrast, samples sheared at 0.1 µm/s showed a microstructure characterized by homogeneous deformation and plastic flow, as well as a flattening-off of the τ-σneff curve. Our results point to a strain rate dependent frictional-to-viscous transition in simulated calcite fault gouge, and have important implications for the processes controlling earthquake nucleation at the base of the seismogenic zone.
Keywords
MSL enriched keywords
minerals
carbonate minerals
calcite
Apparatus
optical microscopy
electron microscopy
scanning electron microscope (SEM)
Apparatus
analogue modelling
deformation experiments
shear box
Ancillary equipment
measurement of temperature
thermometer
fault rock
fault gouge
tectonic deformation structure
tectonic fault
Apparatus
deformation testing
shear testing
Measured property
mechanical strength
shear strength
friction - controlled slip rate
rate and state friction (RSF) parameters
friction - controlled stress
slip rate
strain
Inferred deformation behavior
deformation behaviour
frictional deformation
ductile deformation
localized deformation
shear band
Measured property
mechanical strength
shear strength
friction - controlled stress
slip rate
strain
Technique
crystal structure analysis
electron diffraction
electron backscatter diffraction (EBSD)
Analyzed feature
deformation microstructure
brittle microstructure
fault gouge microstructure
Y shear
grain size and configuration
crystallographic preferred orientation (CPO)
MSL vocabulary keywords corresponding to originally assigned keywords
calcite
optical microscopy
scanning electron microscope (SEM)
shear box
thermometer
Originally assigned keywords
EPOS
multi-scale laboratories
rock and melt physical properties
European Plate Observing System
breccia_gouge_series
calcite
carbonate_sedimentary_rock
EARTH SCIENCE > SOLID EARTH > TECTONICS > EARTHQUAKES > EARTHQUAKE MAGNITUDE/INTENSITY
EARTH SCIENCE > SOLID EARTH > TECTONICS > EARTHQUAKES > EARTHQUAKE OCCURRENCES
Friction > Imposed Stress
Optical Microscope
Photography
Powder Mixture
Rock
Scanning Electrone Microscope
Shear Box
Strain gauge > Axial strain gauge
Strength > Yield Strength
Thermocouple
Triaxial
Metadata
MSL enriched sub domains
microscopy and tomography
analogue modelling of geologic processes
rock and melt physics
Resource Type
Source publisher
| GFZ Data Services |
DOI
| 10.5880/fidgeo.2017.012 |
Creators
| Verberne, Berend Antonie |
| Personal |
| https://orcid.org/0000-0002-1208-6193 |
| High Pressure & Temperature Laboratory, Utrecht University |
| Chen, Jianye |
| Personal |
| https://orcid.org/0000-0002-5973-5293 |
| High Pressure & Temperature Laboratory, Utrecht University |
| Pennock, Gillian |
| Personal |
| https://www.scopus.com/authid/detail.uri?authorId=7006507017 |
| Structural Geology & Tectonics, Utrecht University |
Contributors
| Verberne, Berend Antonie |
| Personal |
| https://orcid.org/0000-0002-1208-6193 |
| High Pressure & Temperature Laboratory, Utrecht University |
| Chen, Jianye |
| Personal |
| https://orcid.org/0000-0002-5973-5293 |
| High Pressure & Temperature Laboratory, Utrecht University |
| Pennock, Gillian |
| Personal |
| https://www.scopus.com/authid/detail.uri?authorId=7006507017 |
| Structural Geology & Tectonics, Utrecht University |
| Experimental rock deformation/HPT-Lab (Utrecht University, The Netherlands) |
| Personal |
| e3a4f5d02528d02c516dbea19c20b32c |
| Utrecht University, The Netherlands |
| Verberne, Berend Antonie |
| Personal |
| High Pressure and Temperature Laboratory, Utrecht University |
Citation
Verberne, B. A., Chen, J., & Pennock, G. (2017). Mechanical data and microstructures of simulated calcite fault gouge sheared at 550°C [Dataset]. GFZ Data Services. https://doi.org/10.5880/FIDGEO.2017.012
References
Dates
| Created | 2017-10-12 |
| Issued | 2017 |
Language
en
Rights
| Name | Creative Commons Attribution 4.0 International |
| URI | https://creativecommons.org/licenses/by/4.0/legalcode |
| Identifier | cc-by-4.0 |
| Identifier Scheme | SPDX |
| Scheme URI | https://spdx.org/licenses/ |
Locations
- no geo-locations found -