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Title: Ensemble Shear Strength, Stability, and Permeability of Mixed Mineralogy Fault Gouge Recovered From 3D Granular Models

Journal Article · · Journal of Geophysical Research. Solid Earth
DOI:https://doi.org/10.1029/2018jb016066· OSTI ID:1614206
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]
  1. Pennsylvania State Univ., University Park, PA (United States). EMS Energy Inst., and G3 Center
  2. Pennsylvania State Univ., University Park, PA (United States). EMS Energy Inst., and G3 Center; Univ. of Texas, Austin, TX (United States). Inst. for Geophysics

We conduct numerical shear experiments on mixtures of quartz and talc gouge using a three-dimensional (3D) distinct element model. A modified slip-weakening constitutive law is applied at contacts. We perform velocity-stepping experiments on both uniform and layered mixtures of quartz and talc analogs. We separately vary the proportion of talc in the uniform mixtures and talc layer thickness in the layered mixtures. Shear displacements are cycled through velocities of 1 and 10 μm/s. We follow the resulting evolution of ensemble shear strength, slip stability, and permeability of the gouge mixture and explore the mesoscopic mechanisms. Simulation results show that talc has a strong weakening effect on shear strength—a thin shear-parallel layer of talc (three particles wide) can induce significant weakening. However, the model offsets laboratory-derived strong weakening effects of talc observed in uniform mixtures, implying the governing mechanisms may be the shear localization effect of talc, which is enhanced by its natural platy shape or preimposed layered structure. Ensemble stability (a – b ) can be enhanced by increasing talc content in uniform talc-quartz mixtures. Reactivation-induced permeability increase is amplified with increased quartz content before the maturation of shear localization. Postmaturation permeability enhances on velocity upsteps and diminishes on velocity downsteps. Talc enhances compaction at velocity downsteps, potentially reducing fault permeability. Evolution trends of stability relating to the composition and structure of the fault gouge are straightforwardly obtained from the 3D simulation. Local friction evolution indicates that talc preferentially organizes and localizes in the shear zone, dominating the shear strength and frictional stability of faults

Research Organization:
Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE)
Grant/Contract Number:
FE0023354
OSTI ID:
1614206
Alternate ID(s):
OSTI ID: 1492190
Journal Information:
Journal of Geophysical Research. Solid Earth, Vol. 124, Issue 1; ISSN 2169-9313
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

References (53)

Simulation of the Influence of Rate- and State-dependent Friction on the Macroscopic Behavior of Complex Fault Zones with the Lattice Solid Model journal August 2002
Fabric induced weakness of tectonic faults: FABRIC INDUCED WEAKNESS journal February 2010
Frictional strengths of talc-serpentine and talc-quartz mixtures journal January 2011
Mineralogical Controls on Frictional Strength, Stability, and Shear Permeability Evolution of Fractures journal May 2018
A review of recent developments concerning the structure, mechanics and fluid flow properties of fault zones journal November 2010
Frictional behavior and constitutive modeling of simulated fault gouge journal January 1990
On the relation between fault strength and frictional stability journal January 2011
Friction of simulated fault gouge for a wide range of velocities and normal stresses journal December 1999
Creation and preservation of subduction-related inverted metamorphic gradients journal January 1987
The importance of the third dimension in granular shear: 3-D MODEL OF GRANULAR SHEAR journal July 2003
Investigating Compaction by Intergranular Pressure Solution Using the Discrete Element Method journal January 2018
Effects of gouge fragment shape on fault friction: New 3D modelling results journal January 2009
Numerical simulations of granular shear zones using the distinct element method: 2. Effects of particle size distribution and interparticle friction on mechanical behavior journal February 1999
Numerical simulations of granular shear zones using the distinct element method: 1. Shear zone kinematics and the micromechanics of localization journal February 1999
Frictional behavior of talc‐calcite mixtures journal September 2015
Effect of particle shape on the shear strength of fault gouge journal January 2016
Modeling of Stick-Slip Behavior in Sheared Granular Fault Gouge Using the Combined Finite-Discrete Element Method journal July 2018
Particle Dynamics Simulations of Rate- and State-dependent Frictional Sliding of Granular Fault Gouge journal August 2004
Shear-induced dilatancy of fluid-saturated faults: Experiment and theory journal January 2009
Assessment of rolling resistance models in discrete element simulations journal January 2011
Relationships between the microstructural evolution and the rheology of talc at elevated pressures and temperatures journal April 2008
On the internal structure and mechanics of large strike-slip fault zones: field observations of the Carboneras fault in southeastern Spain journal June 2003
Macroscopic Young’s Elastic Modulus Model of Particle Packing Rock Layers journal January 2012
Fault zone weakening and character of slip along low-angle normal faults: insights from the Zuccale fault, Elba, Italy journal December 2004
Rolling Resistance at Contacts in Simulation of Shear Band Development by DEM journal March 1998
Localization of deformation triggered by chemo-mechanical feedback processes journal February 2012
DEM simulation of normal faults in cohesive materials journal November 2011
Talc-rich hydrothermal rocks from the St. Paul and Conrad fracture zones in the Atlantic Ocean [Talc-rich hydrothermal rocks from the St. Paul and Conrad fracture zones in the Atlantic Ocean] journal February 2004
Earthquakes and friction laws journal January 1998
Clay gouge journal August 1999
Three-dimensional discrete element modeling of triggered slip in sheared granular media journal April 2014
Discrete element modeling of indentation tests to investigate mechanisms of CO 2 ‐related chemomechanical rock alteration journal November 2016
Talc-bearing serpentinite and the creeping section of the San Andreas fault journal August 2007
Influence of normal stress and grain shape on granular friction: Results of discrete element simulations journal January 2004
Friction of sheared granular layers: Role of particle dimensionality, surface roughness, and material properties: SHEARED GRANULAR LAYERS journal March 2007
Influence of grain characteristics on the friction of granular shear zones: GRAIN SHAPE INFLUENCE ON FRICTION journal October 2002
A novel three-dimensional contact model for granulates incorporating rolling and twisting resistances journal April 2015
Modeling of rock friction: 1. Experimental results and constitutive equations journal January 1979
Influence of weakening minerals on ensemble strength and slip stability of faults: Influence of Weakening Minerals on Fault journal September 2017
Numerical Recipes: The Art of Scientific Computing journal November 1987
Growth and deformation mechanisms of talc along a natural fault: a micro/nanostructural investigation journal March 2009
Rolling friction as a technique for modelling particle shape in DEM journal February 2012
Earthquake nucleation on faults with rate-and state-dependent strength journal September 1992
Slip instability and state variable friction laws journal December 1983
Fluid-rock reaction weakening of fault zones journal July 1995
Influence of particle characteristics on granular friction journal January 2005
Laboratory-Derived Friction laws and Their Application to Seismic Faulting journal May 1998
Influence of dilatancy on the frictional constitutive behavior of a saturated fault zone under a variety of drainage conditions journal January 2011
A discrete numerical model for granular assemblies journal March 1979
Numerical recipes: The art of scientific computing journal January 1987
Numerical Recipes: The Art of Scientific Computing journal January 1989
Numerical recipes — The art of scientific computing journal March 1988
Modeling of Stick-Slip Behavior in Sheared Granular Fault Gouge Using the Combined Finite-Discrete Element Method text January 2018

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