Oxygen isotopic and chemical compositions of cosmic spherules collected from the Antarctic ice sheet: Implications for their precursor materials

Toru Yada, Tomoki Nakamura, Takaaki Noguchi, Noriko Matsumoto, Minoru Kusakabe, Hajime Hiyagon, Takayuki Ushikubo, Naoji Sugiura, Hideyasu Kojima, Nobuo Takaoka

研究成果: Contribution to journalArticle査読

45 被引用数 (Scopus)

抄録

Bulk chemical compositions and oxygen isotopic compositions were analyzed for 48 stony cosmic spherules (melted micrometeorites) collected from the Antarctic ice sheet using electron- and ion-microprobes. No clear correlation was found between their isotopic compositions and textures. The oxygen isotopic compositions showed an extremely wide range from -28‰ to +93‰ in δ18O and from -21‰ to +13‰ in Δ17O. In δ18O-δ17O space, most samples (38 out of 48) plot close to the terrestrial fractionation line, but 7 samples plot along the carbonaceous chondrite anhydrous mineral (CCAM) line. Three samples plot well above the terrestrial fractionation line. One of these has a Δ17O of +13‰, the largest value ever found in solar system materials. One possible precursor for this spherule could be 16O-poor planetary material that is still unknown as a meteorite. The majority of the remaining spherules are thought to be related to carbonaceous chondrites.

本文言語英語
ページ(範囲)5789-5804
ページ数16
ジャーナルGeochimica et Cosmochimica Acta
69
24
DOI
出版ステータス出版済み - 12 15 2005
外部発表はい

All Science Journal Classification (ASJC) codes

  • 地球化学および岩石学

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