Statistics
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983gecoa..47.1635h&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 47, Sept. 1983, p. 1635-1650.
Statistics
10
Feldspars, High Resolution, Ion Probes, Magnesium Isotopes, Mass Ratios, Meteoritic Composition, Chemical Fractionation, Inclusions, Isotope Separation, Mass Spectroscopy, Minerals, Silicon Isotopes, Thermal Emission, Meteorites, Allende, Ion Microprobe, Magnesium, Panpurge, Analysis, Techniques, Isotopic Ratios, Procedure, Silicon, Element Ratios, Minerals, Inclusions, Wa, Fun, Cl, Enrichment, Crystals, Isocrons, Comparisons, Composition, Metamorphism, Plagioclase, Concentration, Fractionation, Spinel
Scientific paper
Isotopic ratios have been determined, at a precision level approaching that of counting statistics using beam switching, by employing PANURGE, a modified CAMECA IMS3F ion microprobe at a mass resolving power of 5000. This technique is used to determine the isotopic composition of Mg and Si and the atomic ratio of Al/Mg in minerals from the Allende inclusion WA and the Allende FUN inclusion C1. Results show enrichment in Mg-26 of up to 260 percent. Results of Mg and Al/Mg measurements on cogenetic spinel inclusion and host plagiclase crystals show Mg-Al isochrons in excellent agreement with precise mineral isochrons determined by thermal emission mass spectrometry. The measurements are found to confirm the presence of substantial excess Mg-26 in WA and its near absence in C1. Data is obtained which indicates a metamorphic reequilibrium of Mg in Allende plagioclase at least 0.6 my after WA formation. Ion probe measurements are obtained which confirm that the Mg composition in Allende C1 is highly fractionated and is uniform among pyroxene, melilite, plagioclase, spinel crystals, and spinel included in melilite and plagioclase crystals.
Armstrong Thomas J.
Huneke J. C.
Wasserburg Gerald J.
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