National Uranium Resource Evaluation: Shiprock Quadrangle, Arizona, New Mexico, Colorado, and Utah
Formations and areas in the Shiprock 1/sup 0/x2/sup 0/ Quadrangle, New Mexico, Arizona, Colorado, and Utah, evaluated to be favorable for uranium deposits of 100 tons U/sub 3/O/sub 8/ at a minimum ore grade of 0.01% include, in decreasing order of relative favorability: (1) the Late Jurassic Salt Wash and Recapture Members of the Morrison Formation located along the western flank of the San Juan Basin; (2) the Late Triassic Shinarump Member of the Chinle Formation located in the northwest segment of the quadrangle in the vicinity of Monument Valley; (3) the Late Cretaceous Toreva Formation in the Black Mesa Basin; and (4) the Late Jurassic Westwater Canyon and Brushy Basin Members of the Morrison Formation along the western flank of the San Juan Basin. Favorability of the above rock units is based on the presence of a significant number of recognition criteria in each of the formations, as well as the presence of known uranium deposits in all stratigraphic units, except in the Westwater Canyon and Brushy Basin Members which contain none. All of the favorable units are considered favorable for sandstone-type deposits (Class 240, Subclass 243 and 244). In all units, host rocks are fluvial and fluvial-lacustrine, contain associated fine-grained impermeable facies, are carbonaceous or exhibit evidence of the former presence of organic matter, and are composed, in large part, of feldspathic sandstone. The remainder of formations and areas in the quadrangle are considered unfavorable for uranium deposits of minimum grade and tonnage because they exhibit adverse geologic and geochemical characteristics and, in general, lack uranium occurrences and radioactive anomalies. These rocks include, in order of decreasing age: (1) Precambrian rocks; (2) all Paleozoic rock formations; (3) all Mesozoic rocks except those listed above as favorable; and (4) all rock formations of Cenozoic age.
- Research Organization:
- Geological Survey, Golden, CO (USA)
- DOE Contract Number:
- AI13-78GJ01686
- OSTI ID:
- 7067027
- Report Number(s):
- PGJ/F-024-82; ON: DE82021150
- Resource Relation:
- Other Information: Includes 6 sheets of 24x reduction microfiche. Portions of document are illegible
- Country of Publication:
- United States
- Language:
- English
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ARIZONA
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EXPERIMENTAL DATA
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050200* - Nuclear Fuels- Exploration- (-1987)