Computer Science
Scientific paper
Feb 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976gecoa..40..149g&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 40, Feb. 1976, p. 149-155. Research supported by the Research Corp. and University of Chi
Computer Science
39
Chemical Composition, Chondrites, Meteoritic Composition, Olivine, Petrography, Alkali Metals, Condensation, Feldspars, Microstructure, Mineralogy, Nepheline, Pyroxenes, Radioactive Age Determination, Sodalite
Scientific paper
Greyish-brown irregularly-shaped aggregates composed predominantly of olivine make up nearly 2% of the Allende meteorite by volume. Many of the aggregates are constructed of subspherical lumps of micron-sized crystals of olivine, pyroxene, nepheline and sodalite surrounded by coarser-grained olivine. Rarely, anorthite, spinel and perovskite are also present. The olivine ranges in composition from Fo64 to Fo99. Pyroxenes range from aluminous diopside to hedenbergite to very Al-rich and Ti-Al-rich varieties. The nepheline contains 1.6-2.4% K2O and 1.6-5.2% CaO but the sodalite is significantly poorer in these elements. The spinel contains 2.1-13.4% FeO. Textural information and oxygen isotopic data suggest that the aggregates are composed of primary, solid condensates from the solar nebula. The perovskite, spinel and Ti-Al-rich pyroxenes are the remains of high-temperature condensates, but the olivine compositions and the presence of feldspathoids indicate that some of the grains continued to react with the solar nebular vapor in the temperature range 500-900 K.
Grossman Lawrence
Steele Ian M.
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