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


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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/45262

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
Publisher DOI:	10.2343/geochemj.1.0057
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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