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Ion probe determinations of the rare earth concentrations of individual meteoritic phosphate grainsA new ion probe method for quantitative measurements of the concentrations of all the REE down to the ppm level in 5-20 micron spots is presented. The first application of the method is the determination of REE abundances in meteoritic phosphates. Results are shown to be in good agreement with previous INAA and ion probe determinations. The merrillites in the St. Severin amphoterite are richer in REE than the apatites (the enrichment factors, for various REE, range from 2.3 to 14.2) in contradiction with the results of Ebihara and Honda (1983). Provided good standards for other mineral phases are found or implanted marker ion techniques are used, the method should find a wide range of applications for the study of both terrestrial and extraterrestrial crystals at the microscopic level.
Document ID
19850052423
Document Type
Reprint (Version printed in journal)
Authors
Crozaz, G. (Washington Univ. Saint Louis, MO, United States)
Zinner, E. (Washington University St. Louis, MO, United States)
Date Acquired
August 12, 2013
Publication Date
April 1, 1985
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 73
Issue: 1 Ap
ISSN: 0012-821X
Subject Category
LUNAR AND PLANETARY EXPLORATION
Funding Number(s)
CONTRACT_GRANT: NAG9-55
CONTRACT_GRANT: NSF EAR-81-16361
Distribution Limits
Public
Copyright
Other