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Although ^3He was below detection limits (2 X 10^\u003c-15\u003e cm^3 STP) in most spherules, ^3He was detectable in three spherules and their ^3He/^4He ratios were close to those of unmelted micrometeorites. Ne and Ar abundances and isotopic compositions were determined for more than half of the spherules. Thirteen samples had high ^\u003c21\u003eNe/^\u003c22\u003eNe ratios, possibly reflecting the presence of cosmogenic ^\u003c21\u003eNe, although blank corrections could not be made for most samples due to the low Ne concentrations. Eight particles had ^\u003c40\u003eAr/^\u003c36\u003eAr ratios lower than the atmospheric value of 296, and five of them also had SEP (solar energetic particles)-like Ne, confirming their extraterrestrial origin. These spherules apparently preserve extraterrestrial noble gases in their interiors in spite of severe heating. 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Remnant extraterrestrial noble gases in Antarctic cosmic spherules
https://doi.org/10.15094/00006034
https://doi.org/10.15094/000060342b90274d-993f-49ff-ac7f-d60bb0ded2f2
名前 / ファイル | ライセンス | アクション |
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KJ00000040870 (3.0 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 2003-03-01 | |||||
タイトル | ||||||
タイトル | Remnant extraterrestrial noble gases in Antarctic cosmic spherules | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | cosmic spherule, micrometeorite, noble gas, laser extraction, solar energetic particles | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
ID登録 | ||||||
ID登録 | 10.15094/00006034 | |||||
ID登録タイプ | JaLC | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
著者名(英) |
Osawa,Takahito
× Osawa,Takahito× Nagao,Keisuke× Noguchi,Takaaki× Nakazawa,Ayako× Mikada,Jyun-ichi |
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著者所属(英) | ||||||
en | ||||||
Laboratory for Earthquake Chemistry, Graduate School of Science, The University of Tokyo/Laboratory for Earthquake Chemistry, Graduate School of Science, The University of Tokyo/Department of Materials and Biological Sciences, Ibaraki University/Department of Materials and Biological Sciences, Ibaraki University/Department of Materials and Biological Sciences, Ibaraki University | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Noble gas abundances in Antarctic cosmic spherules collected from the Tottuki Point on the Soya Coast, Antarctica, are considerably lower than those reported in unmelted micrometeorites, indicating severe heating of the cosmic spherules during atmospheric entry. Although ^3He was below detection limits (2 X 10^<-15> cm^3 STP) in most spherules, ^3He was detectable in three spherules and their ^3He/^4He ratios were close to those of unmelted micrometeorites. Ne and Ar abundances and isotopic compositions were determined for more than half of the spherules. Thirteen samples had high ^<21>Ne/^<22>Ne ratios, possibly reflecting the presence of cosmogenic ^<21>Ne, although blank corrections could not be made for most samples due to the low Ne concentrations. Eight particles had ^<40>Ar/^<36>Ar ratios lower than the atmospheric value of 296, and five of them also had SEP (solar energetic particles)-like Ne, confirming their extraterrestrial origin. These spherules apparently preserve extraterrestrial noble gases in their interiors in spite of severe heating. Sample To440080 has ^<40>Ar/^<36>Ar ratio (566.3±14.8) higher than that of terrestrial atmosphere in spite of the presence of SEP-like Ne, indicating different source material from some spherules and micrometeorites. Extraterrestrial Ne and Ar were not identified in 22 of 31 analyzed spherules, although relative noble gas abundances of fifteen spherules were similar to those of unmelted micrometeorites and clearly distinguishable from terrestrial materials such as terrestrial basalt, air, and water, reflecting their extraterrestrial origin. Since noble gas abundances in Antarctic spherules can be explained as mixtures of solar and Q-components and the contribution of adsorption air is insignificant, a majority of these Antarctic spherules represent accreted extraterrestrial material and are not volcanic products. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA11182426 | |||||
書誌情報 |
Antarctic meteorite research 巻 16, p. 196-219, 発行日 2003-03 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |