ISOTOPES OF URANIUM IN NATURAL CONDITIONS. II. ISOTOPIC COMPOSITION OF URANIUM OF MINERALS

Journal Article · Sun Jan 01 00:00:00 EST 1961 · Geokhimiya (U.S.S.R.) For English translation 1956-63 see Geochemistry (USSR)

OSTI ID:4818910

Cherdyntsev, V V; Orlov, D P; Isabaev, E A; Ivanov, V I

The deviation of U/sup 234//U/sup 238/ from the equilibrium state is in most cases, if not always, connected with the removal of uranium from the mineral, the uranium of solutions and of the minerals precipitated from them proving to be enriched in U/sup 234/, and the uranium which remained in the mineral being somewhat empoverished in this isotope. An excess of U/sup 234/ is detected in some endogenic minerals. ln a number of cases, including such as primary visually preserved minerals, a deficiency in U/sup 234/ is observed. This bears witness of an intensive uranium migration in the zone of epigenesis. A measurable U/sup 235/ excess may accumulate as a result of the decay of some transuranium isotope, being present in the mineral. The surplus content of U/sup 235/ in magnetites of a pegmatite vein by 45 plus or minus 5 and 23 plus or minus 6 percent is confirmed. The other minerals of this ore body have a normal isotopic conaposition which indicates the local presence of transuranium emitter in the magnetite. An excess of actinium (and U/sup 234/) is also found in this mineral. An excess of U/sup 235/ of about 40 percent is established in one of the molybdenite samples. A bond between minerals with a surplus of U/sup 235/ and minerals with a surplus actinium is outlined but its character is not found. (auth)

• Research Organization: Geological Inst., Academy of Sciences, moscow; and Kazakh State Univ., Alma-Ata
• NSA Number: NSA-16-002030
• OSTI ID: 4818910
• Journal Information: Geokhimiya (U.S.S.R.) For English translation 1956-63 see Geochemistry (USSR), Vol. Vol: No. 10; Other Information: Orig. Receipt Date: 31-DEC-62
• Country of Publication: Country unknown/Code not available
• Language: Russian

Related Subjects

GEOLOGY, MINERALOGY, AND METEOROLOGY
ACTINIDES
ACTINIUM
DECAY
DIFFUSION
DISTRIBUTION
ENRICHMENT
GEOCHEMISTRY
IRON OXIDES
MAGNETITE
MINERALS
MOLYBDENITE
MOLYBDENUM SULFIDES
OXIDES
PRECIPITATION
QUANTITY RATIO
SOLUTIONS
SPINELS
URANIUM 234
URANIUM 235
URANIUM 238
URANIUM ISOTOPES
URANIUM MINERALS
VARIATIONS