Classification of fault breccias and related fault rocks

  title={Classification of fault breccias and related fault rocks},
  author={Nigel H. Woodcock and K. Mort},
  journal={Geological Magazine},
  pages={435 - 440}
Abstract Despite extensive research on fault rocks, and on their commercial importance, there is no non-genetic classification of fault breccias that can easily be applied in the field. The present criterion for recognizing fault breccia as having no ‘primary cohesion’ is often difficult to assess. Instead we propose that fault breccia should be defined, as with sedimentary breccia, primarily by grain size: with at least 30% of its volume comprising clasts at least 2 mm in diameter. To… 
Discussion of ‘Classification of fault breccias and related fault rocks’, by Woodcock & Mort: the particular problem of pseudotachylyte
J. F. Magloughlin comments: I would like to compliment Woodcock & Mort on an important attempt to bring more order to the complex and under-attended world of fault rock classification. The authors
Fissure fills along faults: Variscan examples from Gower, South Wales
Abstract The extent to which persistent, rather than transient, fissures (wide planar voids) can exist along upper crustal faults is important in assessing fault permeability to mineral and
Hydrogeological properties of fault zones in a karstified carbonate aquifer (Northern Calcareous Alps, Austria)
This study presents a comparative, field-based hydrogeological characterization of exhumed, inactive fault zones in low-porosity Triassic dolostones and limestones of the Hochschwab massif, a
Permeability of carbonate fault rocks: a case study from Malta
The inherent heterogeneity of carbonate rocks suggests that carbonate-hosted fault zones are also likely to be heterogeneous. Coupled with a lack of host–fault petrophysical relationships, this makes


Quantifying fault breccia geometry : Dent Fault, NW England
Fault Rock Classification: An aid to structural interpretation in mine and exploration geology
Faults are important to the economic geologist in that they can either control the formation of some classes of ore deposits or modify the position and geometry of ore bodies. Fault rock
Chaotic breccia along the Dent Fault, NW England: implosion or collapse of a fault void?
A body of chaotic breccia along the reverse-oblique Dent Fault zone is ascribed to hanging-wall collapse into persistent voids created by geometric mismatch of fault walls, although some implosion
Fault Rocks of the Moine Thrust Zone: A Guide to Their Nomenclature
The aim of this article is to extract from the existing literature a consistent nomenclature that can be used in the description of coherent fault rocks. The nomenclature is dealt with in this paper.
Carbonate dilation breccias: examples from the damage zone to the Dent Fault, northwest England.
The obliqu-reverse Dent Fault, northwest England, throws Carboniferous limestone units in the footwall against mudston-dominated lower Paleozoic rocks in the hanging wall. The fault zone cuts the
Brecciation processes in fault zones: Inferences from earthquake rupturing
Surface-rupture patterns and aftershock distributions accompanying moderate to large shallow earthquakes reveal a residual brittle infrastructure for established crustal fault zones, the complexity
A classification of metamorphic rocks
Introduction The purpose of this paper is to present a comprehensive classification of metamorphic rocks, the attempt being made to work out a satisfactory scheme without the introduction of new
Fault rocks and fault mechanisms
  • R. Sibson
  • Geology
    Journal of the Geological Society
  • 1977
Physical factors likely to affect the genesis of the various fault rocks—frictional properties, temperature, effective stress normal to the fault and differential stress—are examined in relation to
Fault-related rocks: Suggestions for terminology
Many traditional terms for fault-related rocks have undergone recent dynamic metamorphism under high-pressure discussions by various groups of specialists. A generally acceptable simplified framework