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Late Cenozoic High- and Low-Angle Normal Faulting and Related Igneous Events in Gold Hill, Northern Deep Creek Mountains, Western Utah
A chronology of Late Cenozoic deformation and related igneous events in the Gold Hill area of the northern Deep Creek Mountains, western Utah was determined by field relationships. The emplacement of a Late Eocene/Early Oligocene quartz monzonite intrusion was followed by as many as three periods of normal faulting which produced faults with east-northeast, northeast, and northwest trends. Leuco-granite dikes commonly occur along the traces of these faults. A previously unrecognized low-angle normal fault was identified in this study. The subhorizontal feature truncates the above mentioned faults and probably moved during the Late Oligocene. The low-angle fault is displaced by normal faults with northeast and north trends. Leuco-granite, andesite, and diabase dikes are often associated with these faults. Olivine basalts occur along faults with east and north-northeast trends. These basalts are interpreted to be approximately 14–12 m.y. old as are the faults along which they were extruded. Late Miocene extension was probably in an east-west direction as indicated by the emplacement of north-trending quartz-adularia dikes at 8 m.y. A high-angle normal fault trends northwest and cuts features of all previously discussed ages and orientations.
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