Oxygen Isotopic Abundances in Calcium- Aluminum-Rich Inclusions from Ordinary Chondrites: Implications for Nebular Heterogeneity-Reference-Cited by-同舟云学术

Oxygen Isotopic Abundances in Calcium- Aluminum-Rich Inclusions from Ordinary Chondrites: Implications for Nebular Heterogeneity

Published:1998-04-17 Issue:5362 Volume:280 Page:414-418
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

McKeegan Kevin D.¹²,Leshin Laurie A.¹²,Russell Sara S.¹²,MacPherson Glenn J.¹²

Affiliation:

1. K. D. McKeegan and L. A. Leshin, Department of Earth and Space Sciences, University of California Los Angeles, Los Angeles, CA 90095–1567, USA.

2. S. S. Russell and G. J. MacPherson, Department of Mineral Sciences, MRC NHB-119, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, USA.

Abstract

The oxygen isotopic compositions of two calcium-aluminum–rich inclusions (CAIs) from the unequilibrated ordinary chondrite meteorites Quinyambie and Semarkona are enriched in 16 O by an amount similar to that in CAIs from carbonaceous chondrites. This may indicate that most CAIs formed in a restricted region of the solar nebula and were then unevenly distributed throughout the various chondrite accretion regions. The Semarkona CAI is isotopically homogeneous and contains highly 16 O-enriched melilite, supporting the hypothesis that all CAI minerals were originally 16 O-rich, but that in most carbonaceous chondrite inclusions some minerals exchanged oxygen isotopes with an external reservoir following crystallization.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference40 articles.

1. The isotopic composition of uranium and lead in Allende inclusions and meteoritic phosphates

2. G. R. Tilton in Meteorites and the Early Solar System J. F. Kerridge and M. S. Matthews Eds. (Univ. of Arizona Press Tucson 1988) pp. 259–275.

3. G. J. MacPherson D. A. Wark J. T. Armstrong in (2) pp. 746–807.

4. The great majority (∼80%) of primitive undifferentiated meteorites observed to fall are classified as ordinary chondrites whereas the more volatile-rich carbonaceous chondrites constitute <5% of observed falls.

5. Evidence for Widespread 26 Al in the Solar Nebula and Constraints for Nebula Time Scales

Cited by 111 articles. 订阅此论文施引文献订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献

1. Oxygen Isotopic Variations in the Calcium, Aluminum-rich Inclusion–forming Region Recorded by a Single Refractory Inclusion from the CO3.1 Carbonaceous Chondrite Dar al Gani 083;The Astrophysical Journal;2024-04-22

2. Calcium–aluminum‐rich inclusions in non‐carbonaceous chondrites: Abundances, sizes, and mineralogy;Meteoritics & Planetary Science;2023-05

3. Disk transport rates from Ti isotopic signatures of refractory inclusions;Meteoritics & Planetary Science;2022-11-10

4. Mineralogy, petrology, and oxygen isotopic compositions of aluminum-rich chondrules from unequilibrated ordinary and the Dar al Gani 083 (CO3.1) chondrite;Geochimica et Cosmochimica Acta;2022-11

5. Early planet formation in embedded protostellar disks;Astronomy & Astrophysics;2022-06