Micro-distribution of oxygen isotopes in a refractory inclusion from the Allende meteorite

Details Micro-distribution of oxygen isotopes in a refractory inclusion from the Allende meteorite Micro-distribution of oxygen isotopes in a refractory inclusion from the Allende meteorite

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994e%26psl.128...47y&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 128, nos. 1-2, p. 47-53

Computer Science

18

Allende Meteorite, Meteoritic Composition, Minerals, Oxygen Isotopes, Secondary Ion Mass Spectrometry, Aluminum, Calcium, Grain Boundaries, Inclusions

Scientific paper

Isotope ratios of oxygen have been measured on a fassaite crystal and the surrounding area of a coarse-grained calcium and aluminum-rich inclusions (CAI) from the Allende meteorite using secondary ion mass spectrometry. Values of delta O-18SMOW for fassaite, spinel, anorthite grains and alteration products are -27 +/- 5, -38 +/- 2, +5 +/- 6, and +4 per mil, respectively, which are consistent with the results obtained on mineral separates. The O isotopic distributions are homogeneous either within individual single crystals of fassaite and anorthite or among the spinel grains within the analytical error. No gradual variation in O isotopic composition was detected even at the boundary between different phases or at cracks inside a phase with a spatial resolution of 10 microns. These observations strongly suggest that the partial exchange of O isotopes in the minerals in the CAI with the surrounding gas through diffusion is an unlikely origin for the observed inter-mineral heterogeneity of O isotopes in the Allende CAIs.

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