Uranium Resource Evaluation Emory Peak Quadrangle Texas

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Wilbert, William Pope
Duex, Timothy W.

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The uranium potential of the 1° by 2° Emory Peak Quadrangle, Texas, was evaluated using criteria established for the National Uranium Resource Evaluation program. Only that portion in the United States was evaluated. Surface and subsurface studies (to a depth of 5,000 ft; 1500 m) were employed, along with chemical, petrologic, hydrogeochemical, and airborne radiometric data. The western half of the quadrangle is in the Basin and Range Province and is characterized by Tertiary silicic volcanic and volcaniclastic rocks overlying Cretaceous carbonate rocks. Stocks and laccoliths of alkalic silicic to mafic rocks intrude both the Tertiary and Cretaceous rocks. The westernmost Great Plains Province (here composed of flat-lying Cretaceous carbonate rocks of the Stockton Plateau) forms the eastern half. Paleozoic leptogeosynclinal rocks of "Ouachita" facies in the Marathon Basin extend into the northern part of the quadrangle. Four environments favorable for uranium deposits have been identified: (1) basal conglomerates and (2) lacustrine-lignite deposits within the Pruett Formation, (3) fluorite deposits at the contacts between alkali rhyolite intrusions and Cretaceous carbonate rocks, and (4) alkaline rhyolitic to syenitic intrusions. Big Bend National Park is largely unevaluated because of access problems with the park service. A karst area near Dryden, which exhibits anomalous uranium, molybdenum, selenium, and arsenic concentrations in stream sediments and which exhibits radiometric anomalies, is also classed as unevaluated because little of it lies within the evaluated area. Another solution feature, the Stilwell Ranch prospect, is interesting academically but is unfavorable.


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