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Neogene structural and volcanic geology of the Gold Mountain-Slate Ridge area, Esmeralda County, Nevada
AuthorWorthington, Joseph E
Geological Sciences and Engineering
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A sequence of eight middle to late Miocene ash-flow sheets overlie late Precambrian and Cambrian sedimentary rocks and Mesozoic granite in the Gold Mountain-Slate Ridge area. Four of the older ash-flow sheets are newly recognized. The area has undergone extension since at least 17 Ma based upon fault offsets, block tilting, the presence of angular unconformities, and units of conglomerate and fanglomerate within the Neogene section. North-south striking normal faults were active about 15-14 Ma; north to northwest-directed extension, coeval with normal faulting in the Bullfrog Hills and movement on the right-lateral Furnace Creek fault zone, occurred mainly between about 11.5 and 7.5 Ma; and uplift of mountain ranges after 7.5 Ma produced the present topography. Extension in the Gold Mountain- Slate Ridge area is comparable in timing, direction, and style, but not magnitude, to that in other areas in the Walker Lane belt.
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Subjectmiddle Miocene ash-flow
late Miocene ash-flow
Precambrian sedimentary rocks
Cambrian sedimentary rocks
Gold Mountain-Slate Ridge area
Furnace Creek fault zone
Walker Lane belt
Mackay Science Project