Faulting and fluid flow in porous rocks and sediments: Implications for mineralisation and other processes

  • Barnicoat A
  • Sheldon H
  • Ord A
  • 44

    Readers

    Mendeley users who have this article in their library.
  • 12

    Citations

    Citations of this article.

Abstract

Faults in sedimentary rocks can act as fluid pathways or barriers to flow and display a range of deformation styles. These features can be explained by behaviours observed in deformation experiments on sedi- mentary rocks that reveal a transition from dilatant brittle faulting and permeability enhancement to cataclasis and permeability reduction, with increasing porosity, grain size and confining pressure. This transition implies that faults in sedimentary rocks are unlikely to act as fluid pathways shallower than ~3 km, unless the sediments have undergone early cementation, or have been exposed following burial and uplift. This has important implications for many geological processes, including fluid circulation in geo- thermal systems, formation of sediment-hosted mineral deposits and earthquakes in subduction zones. Stratiform Zn–Pb deposits that have been interpreted as syngenetic, seafloor deposits could instead be interpreted as early epigenetic deposits representing the depth at which faults change from fluid pathways to barriers. Editorial handling: P. Williams A. C. Barnicoat (*) Predictive Mineral Discovery Co-operative Resear

Author-supplied keywords

  • Faulting
  • Fluid flow
  • Mineralisation
  • Permeability

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Authors

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free