Oxygen Isotopes of Chondritic Components

Abstract

Research Article| January 01, 2008 Oxygen Isotopes of Chondritic Components Hisayoshi Yurimoto; Hisayoshi Yurimoto Department of Natural History Sciences, Isotope Imaging Laboratory of CRIS, Hokkaido University, Sapporo 060-0810, Japan, [e-mail] Search for other works by this author on: GSW Google Scholar Alexander N. Krot; Alexander N. Krot Hawai'i Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, University of Hawai'i at Manoa, Honolulu, Hawai'i 96822, U.S.A. Search for other works by this author on: GSW Google Scholar Byeon-Gak Choi; Byeon-Gak Choi Seoul National University, Earth Science Education, Gwanak-Gu, Silliing-Dong, Seoul 151-748, South Korea Search for other works by this author on: GSW Google Scholar Jerome Aléon; Jerome Aléon Centre de Spectrometrie Nucleaire et de Spectrometrie de Masse, Bat 104, 91405 Orsay Campus, France Search for other works by this author on: GSW Google Scholar Takuya Kunihiro; Takuya Kunihiro Institute for Study of the Earth's Interior, Okayama University, Yamada 827, Misasa, Tottori 682-0193, Japan Search for other works by this author on: GSW Google Scholar Adrian J. Brearley Adrian J. Brearley Institute of Meteoritics, Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, New Mexico 87131, U.S.A. Search for other works by this author on: GSW Google Scholar Author and Article Information Hisayoshi Yurimoto Department of Natural History Sciences, Isotope Imaging Laboratory of CRIS, Hokkaido University, Sapporo 060-0810, Japan, [e-mail] Alexander N. Krot Hawai'i Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, University of Hawai'i at Manoa, Honolulu, Hawai'i 96822, U.S.A. Byeon-Gak Choi Seoul National University, Earth Science Education, Gwanak-Gu, Silliing-Dong, Seoul 151-748, South Korea Jerome Aléon Centre de Spectrometrie Nucleaire et de Spectrometrie de Masse, Bat 104, 91405 Orsay Campus, France Takuya Kunihiro Institute for Study of the Earth's Interior, Okayama University, Yamada 827, Misasa, Tottori 682-0193, Japan Adrian J. Brearley Institute of Meteoritics, Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, New Mexico 87131, U.S.A. Publisher: Mineralogical Society of America First Online: 03 Mar 2017 © The Mineralogical Society Of America Reviews in Mineralogy and Geochemistry (2008) 68 (1): 141–186. https://doi.org/10.2138/rmg.2008.68.8 Article history First Online: 03 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Hisayoshi Yurimoto, Alexander N. Krot, Byeon-Gak Choi, Jerome Aléon, Takuya Kunihiro, Adrian J. Brearley; Oxygen Isotopes of Chondritic Components. Reviews in Mineralogy and Geochemistry 2008;; 68 (1): 141–186. doi: https://doi.org/10.2138/rmg.2008.68.8 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyReviews in Mineralogy and Geochemistry Search Advanced Search Abstract We review the oxygen isotopic compositions of chondrite components (refractory inclusions, chondrules, and matrix) and their inter- and intra- crystalline oxygen isotopic distributions. Primary oxygen isotopic compositions, acquired before planetesimal accretion, are easily disturbed by parent-body processes such as aqueous alternation and thermal metamorphism. Primary or original oxygen isotopic compositions of refractory inclusions (Ca-, Al-rich inclusions and amoeboid olivine aggregates) distribute along a slope-1 line on the three-oxygen isotope diagram over the range of −60‰ < δ17O ≈ δ18O < +10‰. The variations suggest that oxygen isotopic compositions of the solar nebular gas temporally and spatially varied between 16O-rich and 17O-, 18O-rich during refractory inclusion formation. On the other hand, primary minerals of most chondrules have small isotopic variations and are enriched in 17O and 18O relative to refractory inclusions, suggesting that chondrule formation occurred in 17O-, 18O-rich nebular gas. However, rare 16O-rich chondrules have been found, suggesting some overlap in the timing of formation of chondrules and refractory inclusions in the solar nebula. Oxygen isotopic compositions of matrix grains distribute along the slope-1 line over the same range as refractory inclusions and chondrules. The similarity in oxygen isotopic distributions suggests that matrix was originally a mechanical mixture of nebular dusts co-generated with chondrules and refractory inclusions. Presolar grains with oxygen isotopic compositions that are clearly distinct from those of solar nebular materials are a trace component of chondrite matrices. Based on these oxygen isotopic characteristics, more than 99.5% of the solid materials in the nebula formed locally in the solar nebula, and the remainder formed in interstellar space. The astrophysical setting of chondrite component formation in the early Solar System is also discussed. Refractory inclusions and 16O-rich matrix dusts formed around the inner edge of the solar nebula. On the other hand, most chondrules and 17O-, 18O-rich matrix dusts seem to have formed elsewhere in the solar nebula. Efficient, large-scale radial mixing of the solar nebular materials may have been an essential process in the formation of chondritic planetesimals. 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