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Volume 54 Supplement 11

Special Issue: Slip and Flow Processes in and below the Seismogenic Region

Fluid flow in mid-to deep crustal shear systems: Experimental constraints, observations on exhumed high fluid flux shear systems, and implications for seismogenic processes

Abstract

The aseismic parts of shear systems at mid-to deep crustal levels can localise the supply of deeply-sourced, high pressure fluids into the shallower level parts of these systems in the seismogenic regime. Even during deformation at elevated temperatures in mid-to deep crustal shear zones, high pore fluid factors promote grain-scale to macroscopic fracture growth and permeability enhancement. The evolution of permeability is governed by dynamic competition between crack growth and crack sealing/healing processes. Steady state creep below the seismic-aseismic transition leads to steady state permeability and continuous fluid flow. In contrast, within and near the base of the seismogenic regime, large cyclic changes in permeability can lead to episodic fluid flow and fluctuations in fluid pressure. At mid-crustal depths, temporal and spatial variations in pore fluid pressure and shear stress within shear networks influence rupture nucleation via cyclic changes in shear strength. Fluid pressure and shear stress cycling can also drive repeated transitions between interseismic creep and rapid, co-seismic slip. Reaction-weakening and reaction-strengthening, during hydrothermal alteration in fluid-active shear systems, can also drive transitions between seismic and aseismic behaviour on longer time-scales.

References

  • Brantley, S. L., B. Evans, S. H. Hickman, and D. A. Crerar, Healing of microcracks in quartz—implications for fluid flow, Geology, 18, 136–139, 1990.

    Article  Google Scholar 

  • Cox, S. F., Faulting processes at high fluid pressures: an example of fault-valve behavior from the Wattle Gully Fault, Victoria, Australia, J. Geophys. Res., 100, 841–859, 1995.

    Google Scholar 

  • Cox, S. F., Deformational controls on the dynamics of fluid flow in mesothermal gold systems, in Fractures, Fluid Flow and Mineralization, edited by K. McCaffrey, L. Lonergan, and J. Wilkinson, pp. 123–140, Geological Society, London, Special Publications, 155, 1999.

    Google Scholar 

  • Cox, S. F., M. A. Etheridge, and V. J. Wall, The role of fluids in syntectonic mass transport, and the localization of metamorphic vein-type ore deposits, Ore Geology Reviews, 2, 65–86, 1987.

    Article  Google Scholar 

  • Cox, S. F., M. A. Knackstedt, and J. Braun, Principles of structural control on permeability and fluid flow in hydrothermal systems, Reviews in Economic Geology, 14, 1–24, 2001.

    Article  Google Scholar 

  • Ferry, J. M. and G. M. Dipple, Fluid flow, mineral reactions, and metasomatism, Geology, 19, 211–214, 1991.

    Article  Google Scholar 

  • Fischer, G. J. and M. S. Paterson, Measurements of permeability and storage capacity in rocks during deformation at high temperature and pressure, in Fault Mechanics and Transport Properties of Rocks, edited by B. Evans and T.-F. Wong, pp. 213–252, San Diego, Academic Press, 1992.

    Chapter  Google Scholar 

  • Hickman, S. H. and B. Evans, Influence of geometry upon crack healing in calcite, Physics and Chemistry of Minerals, 15, 91–102, 1987.

    Article  Google Scholar 

  • Holness, M. B., The permeability of non-deforming rock, in Deformation-Enhanced Fluid Transport in the Earth’s Crust and Mantle, edited by M. B. Holness, pp. 9–39, London, Chapman and Hall, 1997.

    Google Scholar 

  • Miller, S. and A. Nur, Permeability as a toggle switch in fluid-controlled crustal processes, Earth Planet. Sci. Lett., 183, 133–146, 2000.

    Article  Google Scholar 

  • Nguyen, P. T., S. F. Cox, C. McA. Powell, and L. Harris, Fault-valve behaviour in optimally-oriented shear zones at Revenge gold mine, Kambalda, Western Australia, Journal of Structural Geology, 20, 1625–1640, 1998.

    Article  Google Scholar 

  • Peach, C. J. and C. J. Spiers, Influence of crystal plastic deformation on dilatancy and permeability development in synthetic salt rock, Tectonophys., 256, 101–128, 1996.

    Article  Google Scholar 

  • Phillips, O. M., Flow and Reactions in Permeable Rocks: Cambridge, U.K., 285 pp., Cambridge University Press, 1991.

  • Ramsay, J. G., The crack-seal mechanism of rock deformation, Nature, 284, 135–139, 1980.

    Article  Google Scholar 

  • Sibson, R. H., Structural permeability of fluid-driven fault-fracture meshes, Journal of Structural Geology, 18, 1031–1042, 1996.

    Article  Google Scholar 

  • Sibson, R. H., F. Robert, and K. H. Poulsen, High-angle reverse faults, fluid-pressure cycling, and mesothermal gold deposits, Geology, 16, 551–555, 1988.

    Article  Google Scholar 

  • Stormont, J. C. and J. K. Daemen, Laboratory study of gas permeability changes in rock salt during deformation, International Journal of Rock Mechanics and Mining Science Geomechanics Abstracts, 29, 325–342, 1992.

    Article  Google Scholar 

  • Zhang, S., S. F. Cox, and M. S. Paterson, The influence of room temperature deformation on porosity and permeability in calcite aggregates, J. Geophys. Res., 99, 15761–15775, 1994.

    Article  Google Scholar 

  • Zhang, S., M. S. Paterson, and S. F. Cox, Microcrack growth and healing in deformed calcite aggregates, Tectonophys., 335, 17–36, 2001.

    Article  Google Scholar 

Download references

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Correspondence to Stephen F. Cox.

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Cox, S.F. Fluid flow in mid-to deep crustal shear systems: Experimental constraints, observations on exhumed high fluid flux shear systems, and implications for seismogenic processes. Earth Planet Sp 54, 1121–1125 (2002). https://doi.org/10.1186/BF03353312

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  • DOI: https://doi.org/10.1186/BF03353312

Keywords

  • Shear Zone
  • Shear System
  • Crack Healing
  • Deep Crustal Level
  • Shear Stress Cycling