Abstract

Crusts of uranium minerals, carnotite and tyuyamunite, were found along some fault planes in the northern Negev, Israel. Field, microscope, and scanning electron microscope (SEM) examinations of the carnotite showed that they crystallized on previously formed faults and then underwent a later deformation. This deformation is evidenced by slickensides and striations that developed on the three scales on the crusts. The carnotites were dated by the 230Th/U method and found to be between 123 and 19 ka, indicating that the most recent displacement along the faults occurred during late Pleistocene to Holocene time. Hence, the U-series of deformed carnotite is suggested as a method for dating young displacement along faults.

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