Computer Science
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989e%26psl..93..181t&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 93, no. 2, June 1989, p. 181-194. Research supported by the Universit
Computer Science
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Meteoritic Composition, Mineralogy, Pyroxenes, Ureilites, Crystallization, Electron Probes, Silicates, Single Crystals, X Ray Diffraction, Meteorites, Ureilites, Mineralogy, Pyroxenes, Formation, X-Ray Methods, Yamato Meteorites, Origin, Antarctic Meteorites, Yamato 791538, Lew 85440, Lew Meteorites, Microprobe Methods, Diffraction, Crystallization, Oxygen, Isotopes, Fugacity, Anomalies, Photomicrographs, Empa, Yamato 74659, Magnesium, Silicates
Scientific paper
The occurrence of orthopyroxene in two magnesian ureilites found in Antarctica, Yamato (Y) 791538 and LEW85440 has been confirmed by electron probe microanalysis and by single-crystal X-ray diffraction. The first coexisting equilibrium pigeonite-orthopyroxene pair has been found in Y791538. The LEW85440 orthopyroxene coexists with minor augite. The orthopyroxenes and olivines in Y791538, Y74659 and LEW85440 have almost identical compositions, but the Ca contents of their coexisting clinopyroxenes differ considerably. These phase assemblages can be explained by crystallization of mafic silicates with a similar composition, oxygen fugacity and oxygen isotope anomaly at different temperature above 1220 C. The high-temperature crystallization of refractory Mg-rich silicates and the possible preservation of the oxygen isotope anomaly of precursor carbonaceous chondrite-like materials may be consistent with their formation processes probably through local melting of more matrices than Mg-rich silicates and crystal growth induced by the planetesimal-scale collision.
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