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Changing Abundance of Magnetofossil Morphologies in Pelagic Red Clay Around Minamitorishima, Western North Pacific
https://doi.org/10.24517/00067004
https://doi.org/10.24517/00067004cd037337-7cfd-4c19-9f7a-e4ad95a3d307
| 名前 / ファイル | ライセンス | アクション |
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SC-PR-USUI-Y-18-4558.pdf (2.2 MB)
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| Item type | 学術雑誌論文 / Journal Article(1) | |||||||
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| 公開日 | 2022-09-01 | |||||||
| タイトル | ||||||||
| タイトル | Changing Abundance of Magnetofossil Morphologies in Pelagic Red Clay Around Minamitorishima, Western North Pacific | |||||||
| 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 | |||||||
| ID登録 | ||||||||
| ID登録 | 10.24517/00067004 | |||||||
| ID登録タイプ | JaLC | |||||||
| 著者 |
Usui, Yoichi
× Usui, Yoichi× Yamazaki, Toshitsugu× Saitoh, Masafumi |
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| 著者別表示 |
臼井, 洋一
× 臼井, 洋一
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| 提供者所属 | ||||||||
| 内容記述タイプ | Other | |||||||
| 内容記述 | 金沢大学理工研究域地球社会基盤学系 | |||||||
| 書誌情報 |
Geochemistry, Geophysics, Geosystems 巻 18, 号 12, p. 4558-4572, 発行日 2017-12-22 |
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| ISSN | ||||||||
| 収録物識別子タイプ | ISSN | |||||||
| 収録物識別子 | 1525-2027 | |||||||
| DOI | ||||||||
| 関連タイプ | isIdenticalTo | |||||||
| 識別子タイプ | DOI | |||||||
| 関連識別子 | 10.1002/2017GC007127 | |||||||
| 出版者 | ||||||||
| 出版者 | American Geophysical Union, Geochemical Society / Wiley Open Access | |||||||
| 抄録 | ||||||||
| 内容記述タイプ | Abstract | |||||||
| 内容記述 | Recent investigations have discovered an unexpected abundance of magnetofossils in oxic pelagic red clays. These have potential to serve as paleoenvironmental tracers in otherwise nonfossiliferous sediments. Here, we report on variations in the abundance and morphology of magnetofossils in red clay from the western North Pacific. Magnetic measurements revealed that magnetofossils dominate the magnetic mineral assemblage of the sediments. An endmember analysis of isothermal remanent magnetization acquisition curves, supplemented by an analysis of S ratios, indicates that the magnetic assemblage can be unmixed into three endmembers, two corresponding to magnetofossils and one to terrigenous magnetic minerals. Direct counting of magnetofossil morphologies under a transmission electron microscope shows that the two magnetofossil endmembers differentiate equant magnetofossils and bullet-shaped magnetofossils, respectively. The stratigraphic variation of the endmember contributions revealed that the equant magnetofossils are dominant for the most part, while an interval at around 7 m in core depth shows higher abundance of the bullet-shaped magnetofossils. This may reflect enhanced organic carbon flux to the sediments. The organic carbon content is low throughout the sediments, and it does not show any change corresponding to the increase of bullet-shaped magnetofossils, pointing at extensive remineralization of the organic carbon. On the basis of lithostratigraphic correlation to nearby drilling sites, we tentatively estimate the age of the bullet-shaped magnetofossil increase as sometime between ∼75 and 25 Ma. These results suggest that environmental information can be obtained from magnetofossils in pelagic red clay. © 2017. American Geophysical Union. All Rights Reserved. | |||||||
| 権利 | ||||||||
| 権利情報 | Copyright © 2017. American Geophysical Union. | |||||||
| 著者版フラグ | ||||||||
| 出版タイプ | VoR | |||||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||
| 関連URI | ||||||||
| 識別子タイプ | URI | |||||||
| 関連識別子 | https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2017GC007127 | |||||||
| 関連名称 | https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2017GC007127 | |||||||
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| 識別子タイプ | URI | |||||||
| 関連識別子 | https://agupubs.onlinelibrary.wiley.com/journal/15252027 | |||||||
| 関連名称 | https://agupubs.onlinelibrary.wiley.com/journal/15252027 | |||||||
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| 識別子タイプ | URI | |||||||
| 関連識別子 | http://sites.agu.org/ | |||||||
| 関連名称 | http://sites.agu.org/ | |||||||
| 関連URI | ||||||||
| 識別子タイプ | URI | |||||||
| 関連識別子 | https://authorservices.wiley.com/open-research/open-access/index.html | |||||||
| 関連名称 | https://authorservices.wiley.com/open-research/open-access/index.html | |||||||
