Mathematics – Logic
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986e%26psl..76..209r&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 76, no. 3-4, Jan. 1986, p. 209-226.
Mathematics
Logic
13
Iron Meteorites, Meteoritic Composition, Cooling, Mineralogy, Oxygen Isotopes, Petrography, Silicates, Meteorites, Iron Meteorites, Guin, Octahedrites, Physical Properties, Origin, Iie Irons, Classification, Nickel, Abundance, Samples, Meteorite, Description, Metal, Composition, Comparisons, Silicate, Inclusions, Petrology, Matrix, Grains, Oxygen, Isotopes, Formation, Impact Effects, Melting, Parent Bodies, Chondrititc Material
Scientific paper
The composition and structure of the Guin ungrouped iron meteorite inclusions have been investigated experimentally. The structural characteristics of polished and etched slabs of the meteorite were studied microscopically in reflected light. Modal abundances of troilite nodules and silicate inclusions were determined by weighing paper traces. The bulk composition of the silicate inclusions was calculated by combining modal phase abundances and mineral compositions. It is found that the largest silicate inclusion (2 x 4 cm) consists mostly of a shock-melted plagioclase-rich matrix surrounding large, partly melted augite grains. The oxygen isotopic composition of the inclusion is near that of LL chondrites. The inclusion is found to be similar in composition to selected melt pocket glasses in ordinary chondrites produced in situ by preferential melting of plagioclase rock due to shock compression. It is suggested that the Guin assemblage was formed by impact melting on a chondritic parent body. Silicate inclusions in IIE irons share many of the compositional and petrological characteristics of the Guin inclusions, indicating that IIE irons also formed by impact-melting of chondritic materials. Black and white photomicrographs of the silicate inclusions are provided.
Clayton Robert N.
Jerde Eric A.
Mayeda Toshiko K.
Rubin Alan E.
Wasson John T.
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