Relationships between Abyssal Redox Conditions and Rock Magnetic Properties of Surficial Sediments in the Western Pacific
Reconstructing changes in deep/bottom-water redox conditions are critical for understanding the role of the deep ocean in global carbon and metals cycling; nevertheless, the quantitative relationships between redox proxies and abyssal dissolved oxygen are poorly investigated. In this work, we studie...
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MDPI AG
2023-05-01
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| Series: | Journal of Marine Science and Engineering |
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| Online Access: | https://www.mdpi.com/2077-1312/11/6/1132 |
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| author | Yanping Chen Dong Xu Huafeng Qin Geng Liu Yibing Li Weiwei Chen Liang Yi |
| author_facet | Yanping Chen Dong Xu Huafeng Qin Geng Liu Yibing Li Weiwei Chen Liang Yi |
| author_sort | Yanping Chen |
| collection | DOAJ |
| description | Reconstructing changes in deep/bottom-water redox conditions are critical for understanding the role of the deep ocean in global carbon and metals cycling; nevertheless, the quantitative relationships between redox proxies and abyssal dissolved oxygen are poorly investigated. In this work, we studied the rock magnetic properties of surficial sediments in the western Pacific to investigate their relationship with regional redox conditions. Our results reveal a consistent sedimentary magnetic mineral assemblage in the western Pacific, dominated by pseudo-single-domain magnetite (Fe<sub>3</sub>O<sub>4</sub>), while the ratio of detrital and biogenic magnetite particles in different sites varies substantially. Detailed analyses identified two major magnetic-coercivity components, with modal coercivity values of 13.1 ± 1.6 mT and 54.7 ± 5.3 mT, respectively. All the magnetic parameters we measured, including both concentration-dependent and grainsize-dependent parameters, and the magnetic coercivities, are generally correlated to sedimentary redox conditions; however, the coercivities obtained by mathematical unmixing exhibit a stronger linkage, explaining about a quarter of variance of redox changes. Our findings confirm the potential of magnetic properties for tracing abyssal redox changes in the western Pacific, while the observed magnetic-redox relationships are complex and need further investigation. |
| first_indexed | 2024-03-11T02:17:55Z |
| format | Article |
| id | doaj.art-f5d5902f642049c5a62c4066f60e29ef |
| institution | Directory Open Access Journal |
| issn | 2077-1312 |
| language | English |
| last_indexed | 2024-03-11T02:17:55Z |
| publishDate | 2023-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Marine Science and Engineering |
| spelling | doaj.art-f5d5902f642049c5a62c4066f60e29ef2023-11-18T11:06:20ZengMDPI AGJournal of Marine Science and Engineering2077-13122023-05-01116113210.3390/jmse11061132Relationships between Abyssal Redox Conditions and Rock Magnetic Properties of Surficial Sediments in the Western PacificYanping Chen0Dong Xu1Huafeng Qin2Geng Liu3Yibing Li4Weiwei Chen5Liang Yi6Zhejiang Academy of Marine Sciences, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, ChinaMNR Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, ChinaState Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, ChinaState Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, ChinaState Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, ChinaState Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, ChinaState Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, ChinaReconstructing changes in deep/bottom-water redox conditions are critical for understanding the role of the deep ocean in global carbon and metals cycling; nevertheless, the quantitative relationships between redox proxies and abyssal dissolved oxygen are poorly investigated. In this work, we studied the rock magnetic properties of surficial sediments in the western Pacific to investigate their relationship with regional redox conditions. Our results reveal a consistent sedimentary magnetic mineral assemblage in the western Pacific, dominated by pseudo-single-domain magnetite (Fe<sub>3</sub>O<sub>4</sub>), while the ratio of detrital and biogenic magnetite particles in different sites varies substantially. Detailed analyses identified two major magnetic-coercivity components, with modal coercivity values of 13.1 ± 1.6 mT and 54.7 ± 5.3 mT, respectively. All the magnetic parameters we measured, including both concentration-dependent and grainsize-dependent parameters, and the magnetic coercivities, are generally correlated to sedimentary redox conditions; however, the coercivities obtained by mathematical unmixing exhibit a stronger linkage, explaining about a quarter of variance of redox changes. Our findings confirm the potential of magnetic properties for tracing abyssal redox changes in the western Pacific, while the observed magnetic-redox relationships are complex and need further investigation.https://www.mdpi.com/2077-1312/11/6/1132deep-sea sedimentsmagnetic propertiesmagnetic coercivityredox changeswestern Pacific |
| spellingShingle | Yanping Chen Dong Xu Huafeng Qin Geng Liu Yibing Li Weiwei Chen Liang Yi Relationships between Abyssal Redox Conditions and Rock Magnetic Properties of Surficial Sediments in the Western Pacific Journal of Marine Science and Engineering deep-sea sediments magnetic properties magnetic coercivity redox changes western Pacific |
| title | Relationships between Abyssal Redox Conditions and Rock Magnetic Properties of Surficial Sediments in the Western Pacific |
| title_full | Relationships between Abyssal Redox Conditions and Rock Magnetic Properties of Surficial Sediments in the Western Pacific |
| title_fullStr | Relationships between Abyssal Redox Conditions and Rock Magnetic Properties of Surficial Sediments in the Western Pacific |
| title_full_unstemmed | Relationships between Abyssal Redox Conditions and Rock Magnetic Properties of Surficial Sediments in the Western Pacific |
| title_short | Relationships between Abyssal Redox Conditions and Rock Magnetic Properties of Surficial Sediments in the Western Pacific |
| title_sort | relationships between abyssal redox conditions and rock magnetic properties of surficial sediments in the western pacific |
| topic | deep-sea sediments magnetic properties magnetic coercivity redox changes western Pacific |
| url | https://www.mdpi.com/2077-1312/11/6/1132 |
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