論文

査読有り
2009年

Discovery of non-radiogenic tungsten isotopic anomalies in the Allende CV3 chondrite

Geochemical Journal
  • Keita Irisawa
  • ,
  • Qing-Zhu Yin
  • ,
  • Takafumi Hirata

43
6
開始ページ
395
終了ページ
402
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.2343/geochemj.1.0037
出版者・発行元
Geochemical Society of Japan

We have measured high-precision W isotope ratios for series of carbonaceous and ordinary chondrites. The resulting 184W/183W ratios for three carbonaceous chondrites (Murchison CM2, Y-793321 CM2, and Y-86751 CV3) did not vary significantly from that of the W isotopic standard (NIST SRM 3163) and various terrestrial rocks, whereas the 184W/183W ratios for Allende CV3 showed ∼0.4ε lower value than the other chondrites and terrestrial samples. This deficiency in the measured 184W/ 183W ratio for the Allende CV3 could not be attributed to the incomplete digestion of acid-resistive presolar components such as SiC grains with abundant s-process nuclides, because the SiC contents in the Allende was significantly lower than those for other carbonaceous chondrites. Several possible explanations for the deficiency in the 184W found in the Allende CV3 were explored. We conclude the results could be best explained by the isotopic heterogeneity of W by contribution of r-process enriched components to the source material of the Allende CAIs. The finding is consistent with the recent observation of some CAIs in Allende was enriched in the r-process nuclide of W (Burkhardt et al., 2008) and supported by the fact that the CAI contents in the Allende chondrite are significantly higher than that in other carbonaceous chondrites. Copyright © 2009 by The Geochemical Society of Japan.

リンク情報
DOI
https://doi.org/10.2343/geochemj.1.0037
ID情報
  • DOI : 10.2343/geochemj.1.0037
  • ISSN : 0016-7002
  • SCOPUS ID : 79955919159

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