AN  INTEGRATED PETROLEUM  EVALUATION OF NORTHEASTERN  NEVADA


Introduction Evaluation Prospects


 

 

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Golconda-Antler Thrust Domain

The Golconda-Antler Thrust Domain is defined by thrusts of post-Permian and pre-Late Triassic age related to emplacement of the Golconda allochthon, and the presence of minor Devonian-Mississippian Antler thrusting. This domain is exposed over a narrow area in the southwestern portion of the area within the Hot Creek, easternmost Monitor, and northern Pancake Ranges, and Moody Mountains; in a small patch in the northernmost Toiyabe Range which extends to the west of the evaluation area; and in a small block in the northern portion of the area which encloses the Adobe Range and Peko Hills.

The Golconda thrusts mapped in the Golconda-Antler Thrust Domain deform Mississippian and Permian rocks and have locally left pieces of the allochthonous Pennsylvanian and Permian Havallah and Pumpernickel Formations. Although dominantly affected by Golconda age thrusts, Antler thrusts placing allochthonous Ordovician Vinini Formation over various Lower Paleozoic units are present locally in the Moody Mountains and Morey Peak area, as well as within the northern Toiyabe Range. Much of the thrust exposure in this domain is in erosional windows through thick, high-angle faulted, Oligocene ignimbrite sheets that were erupted from calderas within and surrounding this domain.

The northern extension of this domain is present north of the Humboldt-Wells lineament and south of the Pequop-Independence lineament. This block includes the Adobe Range and Peko Hills where low-angle faults place Ordovician, Silurian, and Devonian allochthonous units over Mississippian through Permian sediments as well as Permian over Mississippian or Early Triassic over Permian rocks. These faults appear to be re-activated Antler and Golconda Thrusts which have been modified by low-angle normal faulting.


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Last modified: 09/12/06