Peri-ore hydromicaceous metasomatites of uranium deposits of fold regions

Journal Article · Wed Dec 01 04:00:00 EST 1982 · Int. Geol. Rev.; (United States)

DOI:https://doi.org/10.1080/00206818209467202· OSTI ID:6234985

Velichkin, V I; Volovikova, I M

During a study of hydrothermal uranium deposits in one of the Paleozoic fold regions, peri-ore metasomatites were recognized. A detailed comparison between the principal geologic-muheralogic features of the hydromicaceous metasomatites and the associated features of well-known types of metasomatically altered rocks, accompanying uranium mineralization demonstrated that the described peri-ore formations occupy an intermediate position between the formation of the beresites and the hydrothermal argillites. A common feature of the petrogenetic processes was their development through acid leaching and then a phase of precipitation. The hydromicaceous metasomatites were close to the beresites in the overall nature of the pH of the solutions and the high activity of K/sub 2/O in them. The metasomatic formations were (1) more finely dispersed nature of the mineral associations of the hydromica rocks as compared with the beresites and (2) had the presence in the hydromicaceous metasomatites of a hydromica of polytype IM with a content of up to 20% of expanding packets instead of the sericite in the beresites, and (3) the presence of hematite in the hydromica rocks in place of pyrite in the beresites, which was associated with the low activity of sulfide sulfur. The hydromicaceous metasomatites were distinguished from the hydrothermal argillites by the absence of kaolinite in the inner zone, probably caused by the low acidity of the solutions, which brought about the hydromica alteration. Peri-ore metasomatites were distributed in all the hydrothermal uranium deposits of the region. 11 references, 7 figures, 3 tables.

• Research Organization: Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Moscow, USSR
• OSTI ID: 6234985
• Journal Information: Int. Geol. Rev.; (United States), Journal Name: Int. Geol. Rev.; (United States) Vol. 24:12; ISSN IGREA
• Country of Publication: United States
• Language: English

Related Subjects

050100* -- Nuclear Fuels-- Reserves
Exploration
& Mining
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
ALUMINIUM COMPOUNDS
ALUMINIUM SILICATES
ARGILLITE
CHALCOGENIDES
CHEMICAL COMPOSITION
ENERGY SYSTEMS
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGY
GEOTHERMAL SYSTEMS
HEMATITE
HYDROTHERMAL SYSTEMS
IRON COMPOUNDS
IRON ORES
IRON OXIDES
KAOLINITE
MINERAL RESOURCES
MINERALIZATION
MINERALS
ORES
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PALEOZOIC ERA
RESOURCES
ROCKS
SEDIMENTARY ROCKS
SHALES
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
URANIUM DEPOSITS
URANIUM ORES