<sup>87</sup>Sr/<sup>86</sup>Sr Isotopic Ratio of Ferromanganese Crusts as a Record of Detrital Influx to the Western North Pacific Ocean
In this study, the Sr isotope ratios (IRs; <sup>87</sup>Sr/<sup>86</sup>Sr) of ferromanganese (Fe–Mn) crusts are analyzed through laser ablation inductively coupled plasma multiple-collector mass spectrometry. A sample collected from off Minamitorishima Island showed uniform...
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MDPI AG
2022-07-01
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| Online Access: | https://www.mdpi.com/2075-163X/12/8/943 |
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| author | Keishiro Azami Naoto Hirano Jun-Ichi Kimura Qing Chang Hirochika Sumino Shiki Machida Kazutaka Yasukawa Yasuhiro Kato |
| author_facet | Keishiro Azami Naoto Hirano Jun-Ichi Kimura Qing Chang Hirochika Sumino Shiki Machida Kazutaka Yasukawa Yasuhiro Kato |
| author_sort | Keishiro Azami |
| collection | DOAJ |
| description | In this study, the Sr isotope ratios (IRs; <sup>87</sup>Sr/<sup>86</sup>Sr) of ferromanganese (Fe–Mn) crusts are analyzed through laser ablation inductively coupled plasma multiple-collector mass spectrometry. A sample collected from off Minamitorishima Island showed uniform Sr IRs (0.70906–0.70927) similar to that of present-day seawater with more than 36 mm thickness. Meanwhile, a detritus-rich sample collected from off northeast (NE) Japan showed a wide variation in Sr IRs (0.707761–0.709963). The Sr IR variation in the Fe–Mn crust from off NE Japan suggests detrital influx contributions from both the NE Japan arc (<0.708) and aeolian dust from China (>0.718). Detrital flux from the NE Japan arc increases from the bottom to middle layers, possibly due to the uplift of the Ou backbone range that occurred after ~2 Ma. The increased influx of the aeolian dust in the outer layer is attributable to global cooling in the Quaternary that increased the loess dust transportation from China to the western North Pacific Ocean. Meanwhile, the influence of the detrital influx on the sample from off Minamitorishima Island appeared to be negligible. The Sr IR analysis with high spatial resolution proposed in this study possibly improves the burial history of Fe–Mn nodules. |
| first_indexed | 2024-03-09T09:51:54Z |
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| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-09T09:51:54Z |
| publishDate | 2022-07-01 |
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| series | Minerals |
| spelling | doaj.art-630f07007a054a5b93b1ffd2786add8f2023-12-02T00:03:13ZengMDPI AGMinerals2075-163X2022-07-0112894310.3390/min12080943<sup>87</sup>Sr/<sup>86</sup>Sr Isotopic Ratio of Ferromanganese Crusts as a Record of Detrital Influx to the Western North Pacific OceanKeishiro Azami0Naoto Hirano1Jun-Ichi Kimura2Qing Chang3Hirochika Sumino4Shiki Machida5Kazutaka Yasukawa6Yasuhiro Kato7Graduate School of Science, Tohoku University, Aramaki-aoba 6-3, Aoba-ku, Sendai 980-8578, JapanCenter for Northeast Asian Studies, Tohoku University, Kawauchi 41, Aoba-ku, Sendai 980-8576, JapanJapan Agency for Marine-Earth Science and Technology (JAMSTEC), Natushima-cho 2-15, Kanagawa, Yokosuka 237-0061, JapanJapan Agency for Marine-Earth Science and Technology (JAMSTEC), Natushima-cho 2-15, Kanagawa, Yokosuka 237-0061, JapanResearch Center for Advanced Science and Technology, The University of Tokyo, Komaba 4-6-1, Meguro-ku, Tokyo 153-8904, JapanOcean Resources Research Center for Next Generation, Chiba Institution of Technology, 2-17-1 Tsudanuma, Chiba, Narashino 275-0016, JapanFrontier Research Center for Energy and Resources, School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, JapanOcean Resources Research Center for Next Generation, Chiba Institution of Technology, 2-17-1 Tsudanuma, Chiba, Narashino 275-0016, JapanIn this study, the Sr isotope ratios (IRs; <sup>87</sup>Sr/<sup>86</sup>Sr) of ferromanganese (Fe–Mn) crusts are analyzed through laser ablation inductively coupled plasma multiple-collector mass spectrometry. A sample collected from off Minamitorishima Island showed uniform Sr IRs (0.70906–0.70927) similar to that of present-day seawater with more than 36 mm thickness. Meanwhile, a detritus-rich sample collected from off northeast (NE) Japan showed a wide variation in Sr IRs (0.707761–0.709963). The Sr IR variation in the Fe–Mn crust from off NE Japan suggests detrital influx contributions from both the NE Japan arc (<0.708) and aeolian dust from China (>0.718). Detrital flux from the NE Japan arc increases from the bottom to middle layers, possibly due to the uplift of the Ou backbone range that occurred after ~2 Ma. The increased influx of the aeolian dust in the outer layer is attributable to global cooling in the Quaternary that increased the loess dust transportation from China to the western North Pacific Ocean. Meanwhile, the influence of the detrital influx on the sample from off Minamitorishima Island appeared to be negligible. The Sr IR analysis with high spatial resolution proposed in this study possibly improves the burial history of Fe–Mn nodules.https://www.mdpi.com/2075-163X/12/8/943western North Pacificpaleoceanographyferromanganese crustferromanganese noduleSr isotope ratio |
| spellingShingle | Keishiro Azami Naoto Hirano Jun-Ichi Kimura Qing Chang Hirochika Sumino Shiki Machida Kazutaka Yasukawa Yasuhiro Kato <sup>87</sup>Sr/<sup>86</sup>Sr Isotopic Ratio of Ferromanganese Crusts as a Record of Detrital Influx to the Western North Pacific Ocean Minerals western North Pacific paleoceanography ferromanganese crust ferromanganese nodule Sr isotope ratio |
| title | <sup>87</sup>Sr/<sup>86</sup>Sr Isotopic Ratio of Ferromanganese Crusts as a Record of Detrital Influx to the Western North Pacific Ocean |
| title_full | <sup>87</sup>Sr/<sup>86</sup>Sr Isotopic Ratio of Ferromanganese Crusts as a Record of Detrital Influx to the Western North Pacific Ocean |
| title_fullStr | <sup>87</sup>Sr/<sup>86</sup>Sr Isotopic Ratio of Ferromanganese Crusts as a Record of Detrital Influx to the Western North Pacific Ocean |
| title_full_unstemmed | <sup>87</sup>Sr/<sup>86</sup>Sr Isotopic Ratio of Ferromanganese Crusts as a Record of Detrital Influx to the Western North Pacific Ocean |
| title_short | <sup>87</sup>Sr/<sup>86</sup>Sr Isotopic Ratio of Ferromanganese Crusts as a Record of Detrital Influx to the Western North Pacific Ocean |
| title_sort | sup 87 sup sr sup 86 sup sr isotopic ratio of ferromanganese crusts as a record of detrital influx to the western north pacific ocean |
| topic | western North Pacific paleoceanography ferromanganese crust ferromanganese nodule Sr isotope ratio |
| url | https://www.mdpi.com/2075-163X/12/8/943 |
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