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Magnetostratigraphic evidence for post-depositional distortion of osmium isotopic records in pelagic clay and its implications for mineral flux estimates
https://doi.org/10.24517/00066998
https://doi.org/10.24517/00066998f1643cf5-1fd2-4864-93dd-691a006a4846
| 名前 / ファイル | ライセンス | アクション |
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SC-PR-USUI-Y-73-2.pdf (1.1 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 | Magnetostratigraphic evidence for post-depositional distortion of osmium isotopic records in pelagic clay and its implications for mineral flux estimates | |||||||
| 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 | 10.24517/00066998 | |||||||
| ID登録タイプ | JaLC | |||||||
| 著者 |
Usui, Yoichi
× Usui, Yoichi× Yamazaki, Toshitsugu |
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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 |
Earth, Planets and Space 巻 73, 号 1, p. 2, 発行日 2021 |
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| 収録物識別子タイプ | ISSN | |||||||
| 収録物識別子 | 1880-5981 | |||||||
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| 収録物識別子タイプ | NCID | |||||||
| 収録物識別子 | AA11211921 | |||||||
| DOI | ||||||||
| 関連タイプ | isIdenticalTo | |||||||
| 識別子タイプ | DOI | |||||||
| 関連識別子 | 10.1186/s40623-020-01338-4 | |||||||
| 出版者 | ||||||||
| 出版者 | Springer Science and Business Media Deutschland GmbH | |||||||
| 抄録 | ||||||||
| 内容記述タイプ | Abstract | |||||||
| 内容記述 | Chemical stratigraphy is useful for dating deep-sea sediments, which sometimes lack radiometric or biostratigraphic constraints. Oxic pelagic clay contains Fe–Mn oxyhydroxides that can retain seawater 187Os/188Os values, and its age can be estimated by fitting the isotopic ratios to the seawater 187Os/188Os curve. On the other hand, the stability of Fe–Mn oxyhydroxides is sensitive to redox change, and it is not clear whether the original 187Os/188Os values are always preserved in sediments. However, due to the lack of independent age constraints, the reliability of 187Os/188Os ages of pelagic clay has never been tested. Here we report inconsistency between magnetostratigraphic and 187Os/188Os ages in pelagic clay around Minamitorishima Island. In a ~ 5-m-thick interval, previous studies correlated 187Os/188Os data to a brief (< 1 million years) isotopic excursion in the late Eocene. Paleomagnetic measurements revealed at least 12 polarity zones in the interval, indicating a > 2.9–6.9 million years duration. Quartz and feldspars content showed that while the paleomagnetic chronology gives reasonable eolian flux estimates, the 187Os/188Os chronology leads to unrealistically high values. These results suggest that the low 187Os/188Os signal has diffused from an original thin layer to the current ~ 5-m interval, causing an underestimate of the deposition duration. The preservation of the polarity patterns indicates that a mechanical mixing such as bioturbation cannot be the main process for the diffusion, so diagenetic redistribution of Fe–Mn oxyhydroxides and associated Os may be responsible. The paleomagnetic chronology presented here also demands reconsiderations of the timing, accumulation rate, and origins of the high content of rare-earth elements and yttrium in pelagic clay around Minamitorishima Island.[Figure not available: see fulltext.] © 2021, The Author(s). | |||||||
| 権利 | ||||||||
| 権利情報 | Copyright © 2021, The Author(s)| Published by the Springer Open | |||||||
| 権利 | ||||||||
| 権利情報 | This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If materialis not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativeco mmons.org/licenses/by/4.0/. | |||||||
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| 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://earth-planets-space.springeropen.com/articles/10.1186/s40623-020-01338-4 | |||||||
| 関連名称 | https://earth-planets-space.springeropen.com/articles/10.1186/s40623-020-01338-4 | |||||||
| 関連URI | ||||||||
| 識別子タイプ | URI | |||||||
| 関連識別子 | https://earth-planets-space.springeropen.com/ | |||||||
| 関連名称 | https://earth-planets-space.springeropen.com/ | |||||||
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| 識別子タイプ | URI | |||||||
| 関連識別子 | https://www.springeropen.com/ | |||||||
| 関連名称 | https://www.springeropen.com/ | |||||||
