Accession Number:

AD0619834

Title:

A PROCEDURE FOR GEOCHEMICAL INTERPRETATION OF TERRESTRIAL RARE-EARTH ABUNDANCE PATTERNS,

Descriptive Note:

Corporate Author:

MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF GEOLOGY AND GEOPHYSICS

Report Date:

1962-08-09

Pagination or Media Count:

8.0

Abstract:

A procedure for geochemical interpretation of rareearth abundances in rocks and minerals is presented. The ratio of each rare-earth abundance in the sample to the corresponding value in chondritic meteorites on logarithmic scale is plotted as a function of atomic number Z. Normalization to chondrites compensates for element-to-element irregularities and reveals small relative abundance variations among neighboring rare earths as a result of natural processes. It is shown that increased order occurs, permitting interpolations and extrapolations to be made with fair confidence, and systematic rare-earth abundance patterns are made apparent. The usefulness of the procedure is discussed using several examples from the existing literature. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE