| Item type |
デフォルトアイテムタイプ_（フル）(1) |
| 公開日 |
2023-03-18 |
| タイトル |
|
|
タイトル |
Mineralogy and noble gas isotopes of micrometeorites collected from Antarctic snow |
|
言語 |
en |
| 作成者 |
Okazaki, Ryuji
Noguchi, Takaaki
Tsujimoto, Shin-ichi
Tobimatsu, Yu
Nakamura, Tomoki
Ebihara, Mitsuru
Itoh, Shoichi
Nagahara, Hiroko
Tachibana, Shogo
Terada, Kentaro
Yabuta, Hikaru
|
| アクセス権 |
|
|
アクセス権 |
open access |
|
アクセス権URI |
http://purl.org/coar/access_right/c_abf2 |
| 権利情報 |
|
|
権利情報 |
© 2015 Okazaki et al. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. |
| 主題 |
|
|
主題Scheme |
Other |
|
主題 |
Antarctic micrometeorites |
| 主題 |
|
|
主題Scheme |
Other |
|
主題 |
Noble gas |
| 主題 |
|
|
主題Scheme |
Other |
|
主題 |
Transmission electron microscopy |
| 主題 |
|
|
主題Scheme |
Other |
|
主題 |
Atmospheric entry heating |
| 主題 |
|
|
主題Scheme |
Other |
|
主題 |
Solar energetic particles |
| 内容記述 |
|
|
内容記述 |
We have investigated seven micrometeorites (MMs) from Antarctic snow collected in 2003 and 2010 by means of electron microscopy, X-ray diffraction, micro-Raman spectroscopy, transmission electron microscopy (TEM) observation, and noble-gas isotope analysis. Isotopic ratios of He and Ne indicate that the noble gases in these MMs are mostly of solar wind (SW). Based on the release patterns of SW 4He, which should reflect the degree of heating during atmospheric entry, the seven MMs were classified into three types including two least heated, three moderately heated, and two severely heated MMs. The heating degrees are well correlated to their mineralogical features determined by TEM observation. One of the least heated MMs is composed of phyllosilicates, whereas the other consists of anhydrous minerals within which solar flare tracks were observed. The two severely heated MMs show clear evidence of atmospheric heating such as partial melt of the uppermost surface layer in one and abundant patches of dendritic magnetite and Si-rich glass within an olivine grain in the other. It is noteworthy that a moderately heated MM composed of a single crystal of olivine has a 3He/4He ratio of 8.44 × 10−4, which is higher than the SW value of 4.64 × 10−4, but does not show a cosmogenic 21Ne signature such as 20Ne/21Ne/22Ne = 12.83/0.0284/1. The isotopic compositions of He and Ne in this sample cannot be explained by mixing of a galactic cosmic ray (GCR)-produced component and SW gases. The high 3He/4He ratio without cosmogenic 21Ne signature likely indicates the presence of a 3He-enriched component derived from solar energetic particles. |
|
言語 |
en |
| 内容記述 |
|
|
内容記述タイプ |
Other |
|
内容記述 |
This work was supported by Grant-in-Aid for Scientific Research (S) (No. 22224010, PI: H. Nagahara) and partly by a Grant-in-Aid for Young Scientists (A) (No. 23684046, PI: R. Okazaki). |
| 出版者 |
|
|
出版者 |
Springer Open |
| 言語 |
|
|
言語 |
eng |
| 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 |
journal article |
| 出版タイプ |
|
|
出版タイプ |
VoR |
|
出版タイプResource |
http://purl.org/coar/version/c_970fb48d4fbd8a85 |
| 関連情報 |
|
|
|
識別子タイプ |
DOI |
|
|
関連識別子 |
10.1186/s40623-015-0261-8 |
| 関連情報 |
|
|
|
識別子タイプ |
DOI |
|
|
関連識別子 |
https://doi.org/10.1186/s40623-015-0261-8 |
| 収録物識別子 |
|
|
収録物識別子タイプ |
ISSN |
|
収録物識別子 |
1880-5981 |
| 開始ページ |
|
|
開始ページ |
90 |
| 書誌情報 |
Earth, Planets and Space
Earth, Planets and Space
巻 67,
p. 90,
発行日 2015-06-17
|
| 旧ID |
48717 |
EarthPlanetsSpace_67_90.pdf (3.9 MB)
