URANIUM AND THORIUM IN IGNEOUS ROCKS OF THE WESTERN TRANSBAIKAL

Journal Article · Mon Jan 01 04:00:00 EST 1962 · Geokhimiya (U.S.S.R.) For English translation 1956-63 see Geochemistry (USSR)

OSTI ID:4778004

Smirnov, V A

In the history of evolution of the Western Transbaikal mobile zone two accumulation cycles of radioactive elements in intrusives are outlined: the lower- paleozoic and the mesozoic. In each of the cycles occurs first an increase of U- and Th-content and of the Th/U-ratio in rocks of successive magmatic phases, and then a lowering of the whole content of radioactive elements and of the Th/U- ratio. In the last magmatic phases of both cycles in parallel with the saturation of the melt with volatile components noticeably increases the role of mobile uranium. A tendency to primary uranium and thorium accumulation in acid and alkaline magma differentiates is outlined. (auth)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-17-003174
• OSTI ID: 4778004
• Journal Information: Geokhimiya (U.S.S.R.) For English translation 1956-63 see Geochemistry (USSR), Journal Name: Geokhimiya (U.S.S.R.) For English translation 1956-63 see Geochemistry (USSR) Vol. Vol: No. 11; ISSN GEOKA
• Country of Publication: Country unknown/Code not available
• Language: Russian

Related Subjects

ACIDITY
DISTRIBUTION
ENRICHMENT
GEOCHEMISTRY
GEOLOGY, MINERALOGY, AND METEOROLOGY
IGNEOUS ROCKS
QUANTITY RATIO
SOLUTIONS
THORIUM
URANIUM
VARIATIONS