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Non-chondritic oxygen isotopic component of metals in a noble-gas-rich chondrite : vestige of stellar wind from the protosun?

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Title: Non-chondritic oxygen isotopic component of metals in a noble-gas-rich chondrite : vestige of stellar wind from the protosun?
Authors: Fujimoto, Kumiko Browse this author
Itoh, Shoichi Browse this author
Ebata, Shingo Browse this author
Yurimoto, Hisayoshi Browse this author
Keywords: oxygen isotopes
chondrite
protosun
solar wind
solar system
Issue Date: 2009
Publisher: The Geochemical Society of Japan
Journal Title: Geochemical Journal
Volume: 43
Start Page: e11
End Page: e15
Abstract: Oxygen isotopic compositions of metal grains in a noble-gas-rich chondrite, NWA 801 CR2, have been determined by secondary ion mass spectrometry. The results show bimodal distribution on Δ17O histogram with peaks of Δ17O = 2.3 and –35.0‰. The 16O-rich peak seems to be due to stellar wind from the protosun. The 16O enrichment is comparable with the most 16O-rich value from chondrite constituents. Difference of oxygen isotopic composition of stellar wind between protosun and the present sun implies how self-pollution by planetary embryos during the planet formation epoch have occurred and whether the present solar photosphere preserves the representative composition of the solar system.
Type: article
URI: http://hdl.handle.net/2115/45262
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 圦本 尚義

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