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Rock magnetism of tiny exsolved magnetite in plagioclase from a Paleoarchean granitoid in the Pilbara craton
https://doi.org/10.24517/00067008
https://doi.org/10.24517/000670089c051574-5a92-42fe-95ca-3d00f41e3a48
| 名前 / ファイル | ライセンス | アクション |
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SC-PR-USUI-Y-16-112.pdf (2.3 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 | Rock magnetism of tiny exsolved magnetite in plagioclase from a Paleoarchean granitoid in the Pilbara craton | |||||||
| 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 | 10.24517/00067008 | |||||||
| ID登録タイプ | JaLC | |||||||
| 著者 |
Usui, Yoichi
× Usui, Yoichi× Shibuya, Takazo× Sawaki, Yusuke× Komiya, Tsuyoshi |
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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 16, 号 1, p. 112-125, 発行日 2015-01-20 |
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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 | 10.1002/2014GC005508 | |||||||
| 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 | Granitoids are widespread in Precambrian terranes as well as the Phanerozoic orogenic belts, but they have garnered little attention in paleomagnetic studies, because granitoids often contain abundant coarse-grained, magnetically unstable oxides. In this study, the first example of tiny, needle-shaped, exsolved oxides in plagioclase in a Paleoarchean granitoid is reported. The magnetic properties of single plagioclase crystals with the exsolved oxide inclusions have been studied to determine their paleomagnetic recording fidelity. Demagnetization experiments and hysteresis parameters indicate that the oxide inclusions are near stoichiometric magnetite and magnetically very stable. First-order reversal curve (FORC) diagrams reveal negligible magnetostatic interactions. Minimal interactions are also reflected by very efficient acquisition of anhysteretic remanent magnetization. Single plagioclase crystals exhibit strong magnetic remanence anisotropies, which require corrections to their paleodirectional and paleointensity data. Nonetheless, quantitative consideration of anisotropy tensors of the single plagioclase crystals indicates that the bias can be mitigated by properly averaging data from a few tens of single crystals. From the nonlinear thermoremanence acquisition of the plagioclase crystals, we estimate that the plagioclase crystals can reconstruct paleointensity up to 50 μT. Local metamorphic condition suggests that those magnetite may carry remanence of ∼3.2 to 3.3 Ga. We suggest that exsolved magnetite in granitoids is potentially a suitable target for the study of the early history of the geomagnetic field, and prompt detailed microscopic investigations as well as paleomagnetic tests to constrain the age of remanence. © 2014. American Geophysical Union. All Rights Reserved. | |||||||
| 権利 | ||||||||
| 権利情報 | Copyright © 2014. 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/epdf/10.1002/2014GC005508 | |||||||
| 関連名称 | https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1002/2014GC005508 | |||||||
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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 | |||||||
