Stardust in Antarctic micrometeorites

Toru Yada, Christine Floss, Frank J. Stadermann, Ernst Zinner, Tomoki Nakamura, Takaaki Noguchi, A. Scott Lea

研究成果: ジャーナルへの寄稿学術誌査読

40 被引用数 (Scopus)


We report the discovery of presolar silicate, oxide (hibonite), and (possibly) SiC grains in four Antarctic micrometeorites (AMMs). The oxygen isotopic compositions of the eighteen presolar silicate (and one oxide) grains found are similar those observed previously in primitive meteorites and interplanetary dust particles, and indicate origins in oxygen-rich red giant or asymptotic giant branch stars, or in supernovae. Four grains with anomalous C isotopic compositions were also detected. 12C/13C as well as Si ratios are similar to those of mainstream SiC grains; the N isotopic composition of one grain is also consistent with a mainstream SiC classification. Presolar silicate grains were found in three of the seven AMMs studied, and are heterogeneously distributed within these micrometeorites. Fourteen of the 18 presolar silicate grains and 3 of the 4 C-anomalous grains were found within one AMM, T98G8. Presolar silicate-bearing micrometeorites contain crystalline silicates that give sharp X-ray diffractions and do not contain magnesiowüstite, which forms mainly through the decomposition of phyllosilicates and carbonates. The occurrence of this mineral in AMMs without resolar silicates suggests that secondary parent body processes probably determine the presence or absence of presolar silicates in Antarctic micrometeorites.

ジャーナルMeteoritics and Planetary Science
出版ステータス出版済み - 8月 2008

!!!All Science Journal Classification (ASJC) codes

  • 地球物理学
  • 宇宙惑星科学


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