Computer Science
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983polre..30...29y&link_type=abstract
(National Institute of Polar Research, Symposium on Antarctic Meteorites, 8th, Tokyo, Japan, Feb. 17-19, 1983) National Institut
Computer Science
1
Chondrites, Meteoritic Composition, Meteoritic Microstructures, Mineralogy, Aluminum Oxides, Histograms, Inclusions, Iron Compounds, Phosphorus Compounds, Silicon Dioxide
Scientific paper
A Brachina-like inclusion is identified in the Yamato-75097 L6 chondrite. The inclusion has a shiny black fusion crust and is relatively large (2.5 x 2.5 x 0.8 cm) and about 15 g in weight. The fusion crust is distinguished clearly from the dull black fusion crust of the host. Microscopically, the inclusion has a fine-grained granular texture and consists mainly of olivine with minor merrillite and plagioclase, and a little chromite. Plagioclase is isotropic and presumably maskelynite. Pyroxene, nickel-iron and troilite were not identified. The texture of the inclusion appears to be similar to that of the Brachina meteorite. Compositions of the constituent minerals are olivine average Fo76, maskelynite An15 Ab75 Or10, and merrillite. Olivine is compositionally homogeneous and relatively Mg-rich compared with that of Brachina. The olivine composition is very similar to that of the host.
Kojima Hedeyasu
Matsumoto Yosuke
Yanai Keizo
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