Statistics – Applications
Scientific paper
Sep 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978gecoa..42.1321s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 42, Sept. 1978, p. 1321-1334.
Statistics
Applications
33
Geochemistry, Ion Probes, Quantitative Analysis, Abundance, Kinetic Energy, Lead (Metal), Magnesium, Mass Spectrometers, Meteoritic Composition, Oxygen Isotopes, Pyroxenes, Silicates
Scientific paper
A method for quantitative analysis of silicates with an ion-microprobe has been developed by suppressing the intensities of interfering molecular ion species based on the difference in the kinetic energy distributions between molecular and single-atom ions. Molecular ions drop their intensities rapidly with increasing energy and are virtually eliminated at the energy level 150 eV higher than the energy acquired by acceleration. Outlines of geochemical applications of the technique are given for: (1) analysis of isotopic composition of Pb in galena; (2) analysis of isotopic composition of Mg in anorthite and hibonite in inclusions in the Leoville meteorite; (3) quantitative analysis of major and trace elements in Ca-rich pyroxene, garnet and plagioclase; (4) determination of REE pattern in hornblende; and (5) in-depth profiling of O-18/O-16 ratios to determine oxygen self-diffusion in silicates in hydrothermal conditions.
Allègre Claude J.
Semet Michel P.
Shimizu Nobumichi
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