Aerial radiometric and magnetic reconnaissance survey of portions of Arizona, Idaho, Montana, New Mexico, South Dakota and Washington. Volume 2-L. St. Johns Quadrangle. Final report
The results of a high-sensitivity, aerial, gamma-ray spectrometer and magnetometer survey of the St. Johns Quadrangle, Arizona and New Mexico, are presented. Instrumentation and methods are described. This work was done by Texas Instruments Incorporated under Bendix Field Engineering Corporation Subcontract No. 78-184-L as part of the US Department of Energy National Uranium Resource Evaluation (NURE) Program. Statistical and geological analysis of the radiometric data revealed 58 uranium anomalies worthy of field-checking as possible prospects. The most noteworthy feature in the St. Johns Quadrangle is the uraniferous province associated with the Triassic Chinle Formation in the west. There are 18 anomalies that indicate the possibility of finding sandstone-type U prospects in the Chinle Formation. Two anomalies are associated with the Triassic Moenkopi Formation and one with the Jurassic Rocks of the San Rafael Group. Significant anomalies related to Cretaceous units include one in the Dakota Sandstone and four in the Mesaverde Group. Tertiary rocks may host sandstone- and vein-type deposits. Possible sandsone-type U is indicated by two anomalies in the Baca Formation and seven in the Bidahochi Formation. Those in the Bidahochi Formation may reflect the presence of local accumulations of bentonite. Ten anomalies in the Datil Formation may have been caused by vein-type deposits, but U-rich felsic volcanics are also a distinct possibility. Many anomalies associated with Quaternary volcanics may reflect vein deposits in felsic volcanics, but the felsic volcanics themselves could create false anomalies. Four anomalies are considered strongenough to be significant. Anomalies associated with Quaternary deposits may be indicative of material derived from uranium-rich units that could host mineralization. Anomalies coinciding with roads, railroads, and towns are most likely caused by construction material transported into those areas.
- Research Organization:
- Texas Instruments, Inc., Dallas (USA)
- DOE Contract Number:
- EY-76-C-13-1664
- OSTI ID:
- 6173496
- Report Number(s):
- GJBX-126(79)(Vol.2L)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
AERIAL PROSPECTING
AERIAL SURVEYING
ARIZONA
DATA
DATA COMPILATION
DATA FORMS
GAMMA SPECTROSCOPY
GEOLOGIC DEPOSITS
GEOPHYSICAL SURVEYS
INFORMATION
MAGNETIC SURVEYS
MAPS
NEW MEXICO
NORTH AMERICA
NUMERICAL DATA
PROSPECTING
RADIOACTIVITY LOGGING
RADIOMETRIC SURVEYS
RESOURCES
ROCKS
SANDSTONES
SEDIMENTARY ROCKS
SOUTHWEST REGION
SPECTROSCOPY
TABLES
URANIUM DEPOSITS
USA
WELL LOGGING
WESTERN REGION
X-RAY SPECTROSCOPY