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fault rock

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fault rock [′fȯlt ‚räk]
(geology)
A rock often found along a fault plane and made up of fragments formed by the crushing and grinding which accompany a dislocation.


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They are not easy to identify, requiring evidence that the fault rock has passed through a melt phase.
One possibility is that fluids trapped in the pores of fault rocks and clays are exerting a strong pressure, jacking the rocks apart and nearly nullifying the frictional stresses.
The expected gold mineralization will be associated with breccia zones where the fault rock has been intensely sheared, altered and replaced with intense hematite and magnetite, chloritization, silicification and copper oxides related to the fault.
 
 
 
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