RARE-EARTH ELEMENT CONCENTRATIONS IN USGS AND CCRMP IGNEOUS ROCK STANDARDS DETERMINED BY HIGH-PERFORMANCE ION CHROMATOGRAPHY

Eleven rare earth elements (REE) have been determined in ten USGS and two CCRMP igneous rock standards using high performance ion chromatogr aphy. Duplicate analyses of two or more separately prepared aliquots o f each sample were undertaken; reproducibility was better than 5% for each of the REE. In most cases, the results compare closely with publi shed REE values for those samples for which the REE are well character ised. Where the results for individual elements are in disagreement wi th published data, the more erratic patterns yielded by the earlier da ta when plotted on chondrite-normalised REE diagrams suggest that valu es determined in this study are of greater accuracy.