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At least 631 records · Page 35Linked to original sources
USGS1979

Interpretation of thermoluminescence patterns around a Wyoming roll-type uranium deposit

Thermoluminescence from quartz and feldspar grains in samples collected from the vicinity of a Wyoming roll-type uranium deposit show an increase in the importance of high-temperature thermoluminescence relative to low-temperature thermoluminescence of samples which are believed to be former positions of the migrating mineralized front. This effect is believed to be due to the increased radiation in the ore coupled with the faster rate of fading of low-temperature thermoluminescence compared to high-temperature thermoluminescence. Both the ratios of thermoluminescent responses from any of a variety of temperature ranges and glow curves (plots of intensity of thermoluminescence versus temperature) can be used to detect the increased importance of high-temperature thermoluminescence relative to low-temperature thermoluminescence of previously mineralized samples. Both ratios and glow curves present a systematic pattern around this deposit; these patterns may have application in uranium prospecting.

Open-File Report↗
USGS1981

Description and preliminary interpretation of core CL-80-2, Clear Lake, Lake County, California

Coring operations in the west basin of Clear Lake produced a regional Quaternary reference section to augment and extend a previous study of cores from Clear Lake. This report concerns 165.8—m—long core CL-80-2, which was continuously cored in 8.0 m of water and has a 65.0 percent recovery. The sedinents in core CL-80-2 are composed primarily of clayey and silty sapropelic mud that is similar to those presently being deposited in the lake. The core ended in coarse CO2—charged sand at 165.8 m. The age of sediment at the bottom of the core is inferred to be approximately 175,000 years.

California↗