Other
Scientific paper
Apr 1966
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1966gecoa..30..399p&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 30, Issue 4, pp.399-400
Other
3
Scientific paper
The material occurring as inclusions and the surrounding metallic matrix of a specimen of the Campo del Cielo meteorite have been examined in detail. The association of phases and the structure of the metallic portion indicate that the meteorite may be designated as a hexahedrite, or a very coarse octahedrite and that the samples examined had been severely deformed. The particular inclusions examined are composed of silicates associated with a large amount of opaque minerals and are separated from the metallic matrix by a complex interface region. Schreibersite, troilite and graphite are the principal components of the interface region, which contains, in addition, chromite, sphalerite and a calcium-rich phosphate. The texture of the minerals of the interface region indicates nonequilibrium conditions; in particular, an initial heating and then a relatively rapid cooling. Petrographie modal analyses of the silicates indicate an average of 37.9 volume per cent Forsterite, 35.3 vol. per cent chromediopside, 18.4 vol. per cent enstatite and 8.4 vol. per cent oligoclase. A mineral suite so composed is comparable to similar silicate inclusions occurring in predominantly metallic meteorites and also to some terrestrial rocks, but is not comparable to other known silicate meteorite assemblages.
Bunch Theodore E.
Massalski Tadeusz B.
Park Frederick R.
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