Breccia dikes and collapse areas are associated with ejection vents that originated deep within the basement. Ejectamenta are predominantly metamorphic schist and gneisses. Breccia dike matrix is highly altered, with serpentine and montmorillonite. Garnet, prominent in ejected blocks and breccia dikes, is varied in color and composition according to detailed optical, chemical, and X-ray study. Gases related to deep-seated igneous activity are believed responsible for the intrusions and for the zonally arranged uranium-copper-vanadium deposit in Navajo Sandstone adjacent to one dike.

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