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  The relative formation ages of ferromagnesian chondrules inferred from their initial aluminum-26/aluminum-27 ratios

Mostefaoui, S., Kita, N. T., Togashi, S., Tachibana, S., Nagahara, H., & Morishita, Y. (2002). The relative formation ages of ferromagnesian chondrules inferred from their initial aluminum-26/aluminum-27 ratios. Meteoritics and Planetary Science, 37(3), 421-438.

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Genre: Journal Article
Alternative Title : Meteorit. Planet. Sci.

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 Creators:
Mostefaoui, S.1, Author           
Kita, N. T., Author
Togashi, S., Author
Tachibana, S., Author
Nagahara, H., Author
Morishita, Y., Author
Affiliations:
1Cosmochemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826294              

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 Abstract: We performed a systematic high-precision secondary ion mass spectrometry Al-26-Mg-26 isotopic study for 11 ferromagnesian chondrules from the highly unequilibrated ordinary chondrite Bishunpur (LL3.1). The chondrules are porphyritic and contain various amounts of olivine and pyroxene and interstitial plagioclase and/or glass. The chemical compositions of the chondrules vary from FeO-poor to FeO-rich. Eight chondrules show resolvable Mg-26 excesses with a maximum delta(26)Mg of similar to1% in two chondrules. The initial Al-26/Al-27 ratios inferred for these chondrules range between (2.28 +/- 0.73) x 10(-5) to (0.45 +/- 0.21) x 10(-5). Assuming a homogeneous distribution of Al isotopes in the early solar system, this range corresponds to ages relative to CAIs between 0.7 +/- 0.2 Ma and 2.4(+0.7)(-0.4) Ma. The inferred total span of the chondrule formation ages is at least I Ma, which is too long to form chondrules by the X-wind. The initial Al-26/Al-27 ratios of the chondrules are found to correlate with the proportion of olivine to pyroxene suggesting that olivine-rich chondrules formed earlier than pyroxene-rich chondrules. Though we do not have a completely satisfactory explanation of this correlation we tentatively interpret it as a result of evaporative loss of Si from earlier generations of chondrules followed by addition of Si to the precursors of later generation chondrules.

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Language(s): eng - English
 Dates: 2002-03
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 6432
ISI: 000174795000007
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Title: Meteoritics and Planetary Science
  Alternative Title : Meteorit. Planet. Sci.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 37 (3) Sequence Number: - Start / End Page: 421 - 438 Identifier: ISSN: 0026-1114