Fault gouge

Fault gouge

Fault gouge is an unconsolidated tectonite (a rock formed by tectonic forces) with a very small grain size. Fault gouge has no cohesion, it is normally an unconsolidated rock type, unless cementation took place at a later stage. Fault gouge forms in the same way as fault breccia, the latter also having larger clasts. [Twiss, R.J. & Moores, E.M., 2000 (6th edition): "Structural Geology", W.H. Freeman & co, ISBN 0-7167-2252-6; p. 55]

Origin

Fault gouge forms by tectonic movement along a localized zone of brittle deformation (a fault zone) in a rock. The grinding and milling that results when the two sides of the fault zone move along each other results in a material that is made of loose fragments. First a fault breccia will form, but if the grinding continues the rock becomes fault gouge.

ee also

*Shale Gouge Ratio (SGR)
*Fault breccia
*Fault (geology)

References


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