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Relationship between CAIs and chondrules: A case study of a compound chondrule from the Allende (CV3) meteorite

Russell, Sara S.; Bodenan, Jean-David; Starkey, Natalie A.; Jeffries, Teresa E.; Kearsley, Anton; Spratt, John; Armytage, Rosalind M. G. and Franchi, Ian A. (2017). Relationship between CAIs and chondrules: A case study of a compound chondrule from the Allende (CV3) meteorite. Geochemical Journal, 51(1) pp. 31–43.

URL: https://www.terrapub.co.jp/journals/GJ/pdf/5101/51...
DOI (Digital Object Identifier) Link: https://doi.org/10.2343/geochemj.2.0445
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Abstract

We report the mineralogy, petrology, major, minor and trace element geochemistry, O and Si isotopes of a complex compound chondrule from the Allende meteorite. The chondrule contains zones of refractory (Ca, Al-rich) regions along with regions more similar to ferromagnesian chondrules. The bulk silicon isotopic composition of the object is δ30Si = –0.71 ± 0.03‰. The oxygen isotopic composition of the different phases within the compound chondrules fall along the Allende chondrule line and range from Δ17O – 12.5 to –2‰. Rare earth element abundances are enriched compared to chondritic levels by up to 15× CI, and show a nebular condensate signature with depletions in Eu and Yb. Our data show that the object evolved in oxygen isotopes in a nebular environment, most likely due to formation from a mixture of diverse components combined with interaction with nebular gas. In addition, differences in olivine composition across the inclusion suggest isotopically distinct oxygen regions also existed in dust in the protoplanetary disk. This object and other compound objects demonstrate that CAIs were present in the chondrule forming region, however they are not found in the majority of chondrules. We speculate that the bulk of the CAIs may have been added into the CV parent body after initial accretion of the body.

Item Type: Journal Item
ISSN: 0016-7002
Project Funding Details:
Funded Project NameProject IDFunding Body
Astronomy and Planetary Sciences at the Open UniversityST/L000776/1STFC (Science & Technology Facilities Council)
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 51676
Depositing User: Ian Franchi
Date Deposited: 20 Oct 2017 13:37
Last Modified: 07 Dec 2018 10:58
URI: http://oro.open.ac.uk/id/eprint/51676
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