التفاصيل البيبلوغرافية
| العنوان: |
Intermittent Beginning to the Formation of Hydrogenous Ferromanganese Nodules in the Vast Field: Insights from Multi-Element Chemostratigraphy Using Microfocus X-ray Fluorescence |
| المؤلفون: |
Machida, Shiki, Shimomura, Ryo, Nakamura, Kentaro, Kogiso, Tetsu, Kato, Yasuhiro |
| المساهمون: |
町田, 嗣樹, 下村, 遼, 中村, 謙太郎, 小木曽, 哲, 加藤, 泰浩, 60359172 |
| بيانات النشر: |
MDPI AG |
| سنة النشر: |
2021 |
| المجموعة: |
Kyoto University Research Information Repository (KURENAI) / 京都大学学術情報リポジトリ |
| مصطلحات موضوعية: |
ferromanganese nodule, µ-XRF, Minamitorishima Island, deep-sea current, Pacific Ocean circulation, the lower circumpolar deep water |
| الوصف: |
南極からの海洋深層水が「国産コバルト資源」を生み出した --南鳥島周辺に広大なマンガンノジュール密集域が形成された原因を特定--. 京都大学プレスリリース. 2022-01-12. ; Vast ferromanganese nodule fields have been found on the deep-sea floor of all oceans worldwide. They have received attention because they potentially provide high-grade metal resources to develop future high- and green-technology. However, how these vast nodule fields were formed and developed owing to their widespread nature or tendency to be denser with an increasing number of nodules has not yet been established. In this study, the fine-scale inner structure of nodules of various sizes was analyzed on the basis of chemical mapping using microfocus X-ray fluorescence. We found that nodules distributed in the vast field around Minamitorishima (Marcus) Island have several types of innermost layers, which correspond to different chemostratigraphic layers of nodules that have been previously reported by us in this region. As nodules grow in order from the center to the outside, the different types in the innermost layer indicate a difference in the timing of the beginning of their growth. Moreover, because the differences in the chemical features of each layer reflect differences in the composition of the original deep-sea water, our results imply that the beginning of nodule formation occurred intermittently at each time of a water mass replacement due to new deep-sea currents flowing into this region. We recognized that the northern part of the study area was dominated by large nodules that started to grow in relatively earlier times, while the southern part tended to have many nodules that grew in relatively later times. Based on these observations, we hypothesize that the intermittent beginning of nodule formation is governed by the northward inflow of the deep-sea current that originated from the Lower Circumpolar Deep Water for an extended time to form the vast nodule field. Because patterns in the timing of nodule formation were different in the eastern and western regions, we thus further propose that the ... |
| نوع الوثيقة: |
article in journal/newspaper |
| اللغة: |
English |
| تدمد: |
2075-163X |
| العلاقة: |
https://www.kyoto-u.ac.jp/ja/research-news/2022-01-12-0Test; http://hdl.handle.net/2433/267456Test; Minerals; 11; 1246 |
| الإتاحة: |
http://hdl.handle.net/2433/267456Test |
| حقوق: |
© 2021 by the authors. Licensee MDPI, Basel, Switzerland. ; This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license. ; https://creativecommons.org/licenses/by/4.0Test/ |
| رقم الانضمام: |
edsbas.7821B00 |
| قاعدة البيانات: |
BASE |
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