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Noble gases in solar-gas-rich and solar-gas-free polymict breccias
https://doi.org/10.15094/00006088
https://doi.org/10.15094/00006088ed5a6d5f-7b6f-4d9c-bd5a-05ee120dc485
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
KJ00004366036 (2.2 MB)
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| Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 公開日 | 2006-10-01 | |||||||||
| タイトル | ||||||||||
| タイトル | Noble gases in solar-gas-rich and solar-gas-free polymict breccias | |||||||||
| 言語 | ||||||||||
| 言語 | eng | |||||||||
| キーワード | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | polymict breccia, noble gas, solar wind, SEP, ordinary chondrite | |||||||||
| 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 | 10.15094/00006088 | |||||||||
| 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) | |||||||||
| 論文名よみ | ||||||||||
| その他のタイトル | Noble gases in solar-gas-rich and solar-gas-free polymict breccias | |||||||||
| 著者名(英) |
Osawa,Takahito
× Osawa,Takahito
× Nagao,Keisuke
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| 著者所属(英) | ||||||||||
| en | ||||||||||
| 1Research Group for Analytical Science, Japan Atomic Energy Agency (JAEA)/Laboratory for Earthquake Chemistry, Graduate School of Science, The University of Tokyo | ||||||||||
| 抄録(英) | ||||||||||
| 内容記述タイプ | Other | |||||||||
| 内容記述 | Polymict breccias are useful for research of solar activity because some preserve plenty of solar noble gases implanted during asteroidal formation processes. In this study, noble gas compositions of Antarctic and non-Antarctic polymict breccias were determined using laser gas-extraction and stepwise pyrolysis techniques. Of the polymict breccias measured in this work, 5 of 18 were identified as gas-rich meteorites (regolith breccias) and 4 of those 5 are H chondrites. The high population of gas-rich H chondrites compared with L and LL chondrites was presumably related to the depth of regolith formed on each parent body. It is notable that the major part of polymict breccias did not have solar noble gases. Noble gas analyses with stepwise heating method were done for 11 polymict breccias. Gas-rich meteorites have high concentrations of solar-derived He and Ne, which were released at relatively low temperature steps. Cosmogenic nuclides were comparatively dominant at high temperature steps. Five sources determined the observed Ar isotopic compositions. The components were: atmospheric, radiogenic, solar wind (SW), solar energetic particles (SEP), and cosmogenic. In contrast, Ne isotopic compositions of most regolith breccias can be explained simply by three-component mixing, such as SW, SEP, and cosmogenic. Indications of primordial trapped components were observed only in Willard (b), in which carbonaceous chondrite clasts were discovered previously. Cosmic-ray exposure ages were calculated from excess ^3He, ^(21)Ne, and ^(38)Ar. Regolith breccias did not have systematically longer ages than gas-poor samples, indicating that the parent body exposure ages of the meteorites on the order of tens of millions of years at most. | |||||||||
| 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 19, p. 58-78, 発行日 2006-10 |
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| 出版者 | ||||||||||
| 出版者 | National Institute of Polar Research | |||||||||
