Uranium and thorium contents and uranium distribution in igneous apatite

Journal Article · Sat Jan 01 04:00:00 EST 1972 · Chikyu Kagaku, v. 5, no. 1, pp. 28-37

OSTI ID:4329682

Tezuka, A

The concentrations of uranium and thorium in the apatite separated from volcanic rocks are higher than those in dacitic volcanic glasses, but in general far less than those in apatite reported on granitic rocks. The partition of thorium between apatite and groundmass of volcanic rocks is almost constant, but that of uranium varies in a wide range. It seems that the measured partition of uranium between apatite and groundmass ls strongly affected by uranium-rich small minerals in the apatite. Local concentration of uranium within apatite grains was confirmed by the fission track method. The application of apatlte for the ionium dating is discussed based on those analytical results and seems to be useful, when the rock sample contains apatite that would be easily separated from tae other minerals, for example, by the leaching method. (auth)

• Research Organization: Gakushuin Univ., Tokyo
• NSA Number: NSA-29-020852
• OSTI ID: 4329682
• Journal Information: Chikyu Kagaku, v. 5, no. 1, pp. 28-37, Journal Name: Chikyu Kagaku, v. 5, no. 1, pp. 28-37; ISSN CKKAA
• Country of Publication: Japan
• Language: Japanese

Related Subjects

*APATITES-- ORE COMPOSITION
*THORIUM-- ABUNDANCE
*URANIUM-- ABUNDANCE
AGE ESTIMATION
IGNEOUS ROCKS
N44100* --Environmental & Earth Sciences--Minerals & Ores
PARTICLE TRACKS
QUANTITATIVE CHEMICAL ANALYSIS