Paleomagnetic studies on single crystals separated from the middle Cretaceous Iritono granite

• 資料種別: 記事
• タイトル: Paleomagnetic studies on single crystals separated from the middle Cretaceous Iritono granite
• 著者・編者: Chie Kato; Masahiko Sato; Yuhji Yamamoto
• 出版事項: 日本 : Springer Nature
• 出版年月日等: 2018-11-13
• 出版年（W3CDTF）: 2018-11-13
• タイトル（掲載誌）: EPS : Earth, Planets and Space
• 巻号年月日等（掲載誌）: 70(176)
• 掲載巻: 70(176)
• ISSN（掲載誌）: 1880-5981
• ISSN-L（掲載誌）: 1343-8832
• 本文の言語コード: eng
• DOI: 10.1186/s40623-018-0945-y; https://doi.org/10.1186/s40623-018-0945-y
• 国立国会図書館永続的識別子: info:ndljp/pid/11189239; https://dl.ndl.go.jp/pid/11189239
• コレクション（共通）: 障害者向け資料
• コレクション（障害者向け資料：レベル1）: テキストデータ
• コレクション（個別）: 国立国会図書館デジタルコレクション > 電子書籍・電子雑誌 > その他; https://dl.ndl.go.jp/collections/B00035
• 収集根拠: オンライン資料収集制度
• 受理日（W3CDTF）: 2018-11-22T14:07:23+09:00
• 保存日（W3CDTF）: 2018-11-21
• 記録形式（IMT）: application/pdf
• オンライン閲覧公開範囲: 国立国会図書館内限定公開
• デジタル化資料送信: 図書館・個人送信対象外
• 遠隔複写可否（NDL）: 可
• 掲載誌（URI）: https://earth-planets-space.springeropen.com/articles
• 掲載誌（国立国会図書館永続的識別子）: info:ndljp/pid/11067456; https://dl.ndl.go.jp/pid/11067456
• 連携機関・データベース: 国立国会図書館 : 国立国会図書館デジタルコレクション; https://dl.ndl.go.jp

• 要約等: Investigations of superchrons are the key to understanding long-term changes of the geodynamo and the mantle’s controlling role. Granitic rocks could be good recorders of deep-time geomagnetic field behavior, but paleomagnetic measurements on whole-rock granitic samples are often disturbed by alterations like weathering, and the presence of multi-domain magnetite. To avoid such difficulties and test the usefulness of single silicate crystal paleomagnetism, here we report rock-magnetic and paleomagnetic properties of single crystals and compare those to the host granitic rock. We studied individual zircon, quartz and plagioclase crystals separated from the middle Cretaceous Iritono granite, for which past studies have provided tight constraints on the paleomagnetism and paleointensity. The occurrence of magnetite was very low in zircon and quartz. On the other hand, the plagioclase crystals contained substantial amounts of fine-grained single-domain to pseudo-single-domain magnetite. Microscopic features and distinctive magnetic behavior of plagioclase crystals indicate that the magnetite inclusions were generated by exsolution. We therefore performed paleointensity experiments by the Tsunakawa–Shaw method on 17 plagioclase crystals. Nine samples passed the standard selection criteria for reliable paleointensity determinations, and the mean value obtained was consistent with the previously reported whole-rock paleointensity value. The virtual dipole moment was estimated to be higher than 8.9 ± 1.8 × 10^<22> Am^2, suggesting that the time-averaged field strength during middle of the Cretaceous normal superchron was several times as large as compared to that of non-superchron periods. Single plagioclase crystals which have exsolved magnetite inclusions can be more suitable for identification of magnetic signals and interpretation of paleomagnetic records than the conventional whole-rock samples or other silicate grains.
• DOI: 10.1186/s40623-018-0945-y; https://doi.org/10.1186/s40623-018-0945-y
• オンライン閲覧公開範囲: インターネット公開
• 著作権情報: Creative Commons Attribution 4.0 International; © The Author(s) 2018.
• 関連情報: Paleomagnetic studies on single crystals separated from the middle Cretaceous Iritono granite (Dataset); https://cir.nii.ac.jp/crid/1883961342338514432
• 関連情報（URI）: https://hdl.handle.net/2324/7236436; http://id.ndl.go.jp/digimeta/11189239; https://dl.ndl.go.jp/pid/11189239; http://link.springer.com/content/pdf/10.1186/s40623-018-0945-y.pdf; http://link.springer.com/article/10.1186/s40623-018-0945-y/fulltext.html
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• 連携機関・データベース: 国立情報学研究所 : CiNii Research; https://cir.nii.ac.jp/
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• 書誌ID（NDLBibID）: 11189239; http://id.ndl.go.jp/bib/11189239