Aerial radiometric and magnetic reconnaissance survey of portions of Arizona, Idaho, Montana, New Mexico, South Dakota and Washington. Volume 2-F. Lewistown Quadrangle. Final report
Results of a high-sensitivity, aerial, gamma-ray spectrometer and magnetometer survey of the Lewistown Quadrangle, Montana, are presented. Instrumentation and methods are described in Volume 1 of this final report. Statistical and geological analysis of the radiometric data revealed 58 uranium anomalies worthy of field-checking as possible prospects. One anomaly may be associated with the Cambrian Flathead Quartzite that may contain deposits similar to the Blind River and Rand uranium deposits. Three anomalies may be indicative of sandstone-type deposits in Jurassic rocks, particularly the Morrison Formation, which hosts uranium mineralization elsewhere. One of the latter anomalies is also related to rocks of the Mississippian Madison Group, and this suggests the possible presence of uranium in limestones of the Mission Canyon Formation. There are 45 anomalies related to the Cretaceous rocks. Lignite in the Hell Creek and Judith River formations and Eagle Sandstone may have caused the formation of 22 epigenetic uranium deposits. Many anomalies occur in the Bearpaw Shale and Claggett Formation. However, only five are considered significant of the remainder are expected to be caused by large amounts of radioactive bentonite or bentonitic shale. Two other Cretaceous units that may host sandstone-type deposits are the Colorado Shale and Kootenai Formation that register 16 and two anomalies respectively. Only one anomaly pertains to Tertiary rocks, and it may be indicative of vein-type deposits in the intrusives of the Judith Mountains. These rocks may also act as source rocks for deposits surrounding the Judith Mountains. Eight anomalies related only to Quaternary units may be demonstrative of uranium-rich source rocks that could host uranium mineralization.Several anomalies are located close to oil fields and may have been cause by radium-rich oil-field brines.
- Research Organization:
- Texas Instruments, Inc., Dallas (USA)
- DOE Contract Number:
- EY-76-C-13-1664
- OSTI ID:
- 6117407
- Report Number(s):
- GJBX-126(79)(Vol.2F); TRN: 79-017326
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
MONTANA
MAGNETIC SURVEYS
RADIOMETRIC SURVEYS
URANIUM DEPOSITS
AERIAL PROSPECTING
AERIAL SURVEYING
DATA COMPILATION
MAPS
QUARTZITES
SANDSTONES
TABLES
DATA
DATA FORMS
GAMMA SPECTROSCOPY
GEOLOGIC DEPOSITS
GEOPHYSICAL SURVEYS
INFORMATION
METAMORPHIC ROCKS
NORTH AMERICA
NUMERICAL DATA
PROSPECTING
RADIOACTIVITY LOGGING
RESOURCES
ROCKS
ROCKY MOUNTAIN REGION
SEDIMENTARY ROCKS
SPECTROSCOPY
USA
WELL LOGGING
X-RAY SPECTROSCOPY
050200* - Nuclear Fuels- Exploration- (-1987)