fault breccia

noun Geology.
angular rock fragments produced by fracture and grinding during faulting and distributed within or adjacent to the fault plane.

Origin:
1890–95

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Although the source of the boulder was not found, gossan fault breccia occurs uphill, in quartz schist rubble.
Locally, fault breccia and slickensides provide direct evidence of fault contacts.
Sericite-altered dikes and carbonate-replaced fault breccia are also considered part of the lower temperature mineralization.
Twenty fault breccia zones are ore-control structures.
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