Fluid flow and ionic diffusion and their roles in the genesis of sandstone-type uranium ore bodies

1976 ◽  
Author(s):  
Harry Clifford Granger
Keyword(s):  
Fluid Flow ◽  
Ionic Diffusion ◽  
Uranium Ore ◽  
Ore Bodies

The genesis of Proterozoic uranium deposits in Australia

1979 ◽  
Vol 291 (1381) ◽  
pp. 339-353 ◽  
Keyword(s):  
Precious Metals ◽  
Mineral Deposits ◽  
Uranium Deposits ◽  
The West ◽  
Acid Magma ◽  
Uranium Ore ◽  
Connate Water ◽  
Ore Bodies ◽  
Mineralizing Fluids ◽  
Proterozoic Age

The principal mineral deposits of Proterozoic age in Australia, not only of uranium but also of base and precious metals, are found within a north-trending belt central to the continent which stretches from Adelaide to Darwin. This belt represents the margin to the West Australian Archaean craton, and comprises orogenic and shelf domains that evolved throughout the Proterozoic; and it is suggested that the formation of the uranium deposits was an integral part of the evolution of the various geosynclines in the belt. The uranium ore bodies occupy structurally prepared features such as shears, faults and breccias, and are clearly introduced, but the source of the mineralizing fluids, and the precise mechanism of deposition, is, in some cases at least, in dispute. Mineralization per ascensum by connate water carrying metals desorbed from the sedimentary pile, or in association with acid magma which may itself be the product of anatexis, is favoured by the author.

scholarly journals Relationship between Uranium Minerals and Pyrite and Its Genetic Significance in the Mianhuakeng Deposit, Northern Guangdong Province

Minerals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 73
Author(s):  
Lirong Li ◽  
Zhengqi Wang ◽  
Deru Xu
Keyword(s):  
Uranium Ore ◽  
Ore Bodies ◽  
Calcite Veins ◽  
Mineral Assemblages ◽  
Independent States ◽  
Resource Type ◽  
Uranium Minerals ◽  
Growth Features ◽  
The Relationship ◽  
Northern Guangdong

Granite-related uranium ore is an important uranium resource type in China and worldwide. Whether the uranium geochemical theory “U6+ oxidative migration and U4+ reductive precipitation” is applicable to the granite-related uranium mineralization theory has not been determined. Detailed field and petrographic work, as well as scanning electron microscopy energy spectrum analysis, are conducted in this study to analyze the relationship between uranium minerals and pyrite from different ore types and evaluate the mechanism for the precipitation and enrichment of uranium in the Mianhuakeng uranium deposit of northern Guangdong. Uranium ore bodies in the Mianhuakeng deposit generally occur as vein-filling or vein-disseminated types. Four different kinds of ores are recognized: fluorite, carbonate, siliceous, and reddening types. Despite differences in the mineral assemblages, veined ores share similar characteristics and show that uranium minerals (1) occur in the central part or periphery of vein-filling ores or in interphase arrangements with syn-ore fluorite, quartz, or calcite veins; (2) occur as veinlets or are disseminated in cataclastic altered granite; (3) are inlaid with gangue minerals, primarily calcite, fluorite, and microcrystalline quartz; and (4) are closely associated with pyrite in aggregates or relatively independent states, forming straight boundaries with syn-ore gangue minerals that have euhedral and intact crystals and show mosaic growth features. All these results indicate that both pyrite and uranium minerals are co-crystallized products of the ore-forming fluid. Combined with previous research suggesting that the reducing fluid was sourced from mantle, this study shows that decreased pressure and temperature, as well as changes in pH and the solubility (saturation) of changes, rather than the redox reaction, caused the uranium precipitation in the Mianhuakeng deposit.

Technique for correcting for overburden effects in ground level radiometric surveys of uranium ore bodies

Geophysics ◽  
1979 ◽  
Vol 44 (1) ◽  
pp. 89-98 ◽  
Author(s):  
B. L. Dickson ◽  
G. J. Clark ◽  
B. J. McGregor
Keyword(s):  
Experimental Study ◽  
Count Rate ◽  
Gamma Ray ◽  
Ground Level ◽  
Spectral Shape ◽  
Correction Factors ◽  
High Count ◽  
Uranium Ore ◽  
Ore Bodies ◽  
Overburden Thickness

An experimental study of the effect of barren overburden on the gamma‐ray spectrum of uranium ore has been made. This has shown that counts in either of the two energy windows 0.56 to 0.64 MeV or 0.66 to 1.01 MeV may be used to correct for the decrease in total count rate as a result of overburden. The correction is limited to an overburden thickness‐density product of approximately [Formula: see text], which is equivalent to a correction factor of 16. Theoretical spectra have been modeled for a geometry similar to that used in the experiment and agree in the changes in spectral shape with overburden thickness. The calculations have also been used to evaluate the effects of ore thickness and to determine the useful limits of the correction factors. The method is mainly applicable to a mining environment where sufficiently high count rates exist.

GEOTHERMAL SURVEYS IN SEDIMENTARY ROCKS NEAR GRANTS AND LAGUNA, NEW MEXICO

Geophysics ◽  
1965 ◽  
Vol 30 (3) ◽  
pp. 396-402
Author(s):  
P. Edward Byerly
Keyword(s):  
New Mexico ◽  
Pore Water ◽  
Water Table ◽  
Sedimentary Rocks ◽  
Uranium Ore ◽  
Ore Body ◽  
Downward Migration ◽  
Ore Bodies ◽  
Oxygenated Water ◽  
Drill Holes

Data obtained from temperature surveys in drill holes over two uranium ore bodies are presented as maps of isotherms at depths of 100 ft or more. Temperature surveys in permeable ore bodies above the water table may reveal zones of downward migration of oxygenated water, or zones with a comparatively large retention of pore water. These zones may be associated with an increased amount of oxidation in an ore body which is not completely oxidized.

234U/238U signatures associated with uranium ore bodies: part 2 Manyingee

2013 ◽  
Vol 118 ◽  
pp. 157-162 ◽  
Author(s):  
Richard T. Lowson ◽  
Mark G. McIntyre
Keyword(s):  
Uranium Ore ◽  
Ore Bodies
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