Accession Number : AD0619834

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

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF GEOLOGY AND GEOPHYSICS

Personal Author(s) : Coryell,Charles D. ; Chase,John W. ; Winchester,John W.

Report Date : 09 AUG 1962

Pagination or Media Count : 8

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)

Descriptors :   (*GEOCHEMISTRY, RARE EARTH ELEMENTS), (*RARE EARTH ELEMENTS, GEOCHEMISTRY), (*PETROLOGY, RARE EARTH ELEMENTS), MINERALS, ROCK, EXTRATERRESTRIAL TOPOGRAPHY, NEUTRON ACTIVATION, RADIOACTIVATION ANALYSIS

Distribution Statement : APPROVED FOR PUBLIC RELEASE