globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2021.116945
A magnetic approach to unravelling the paleoenvironmental significance of nanometer-sized Fe hydroxide in NW Pacific ferromanganese deposits
Author: Jiang X.; Zhao X.; Zhao X.; Chou Y.-M.; Hein J.R.; Sun X.; Zhong Y.; Ren J.; Liu Q.
Source Publication: Earth and Planetary Science Letters
ISSN: 0012821X
Publishing Year: 2021
Volume: 565
Language: 英语
keyword in Chinese: amorphous Fe-hydroxides ; Fe-Mn nodules and crusts ; superparamagnetism ; temperature dependence of magnetic susceptibility
Keyword: Binary alloys ; Deposits ; Ferroalloys ; Iron alloys ; Iron ores ; Magnetic susceptibility ; Manganese alloys ; Oceanography ; Superparamagnetism ; Amorphous fe-hydroxide ; Biogenics ; Economic potentials ; Fe-Mn deposits ; Fe-mn nodule and crust ; Ferromanganese crusts ; Ferromanganese nodules ; Pacific ocean ; Temperature dependence of magnetic susceptibility ; Water depth ; Temperature distribution ; amorphous medium ; detrital deposit ; iron hydroxide ; magnetic anomaly ; magnetic susceptibility ; paleoenvironment ; temperature effect
English Abstract: Ferromanganese nodules and crusts (Fe-Mn deposits) are being widely explored for their significant economic potential and paleoenvironmentally significant archives. Fe-Mn deposits contain abundant Fe-bearing minerals including detrital minerals, biogenic Fe-bearing components, but predominantly amorphous Fe hydroxides (AFH). Particularly, the hydrogenetic Fe that is formed in bottom water should be closely related with oceanic environmental and Fe-cycling processes. However, it remains challenging to characterize and quantify the x-ray amorphous AFH component in Fe-Mn deposits. To resolve this problem, we systematically investigated thermally treated hydrogenetic Fe-Mn deposits sampled from the northwestern Pacific Ocean to unravel the AFH component. Our results show that the nanometer-sized AFHs can be transformed into strongly magnetic nanometer-sized (approximately 10-20 nm) magnetite upon heating above 500 °C, which can be feasibly quantified by systematic rock magnetic analyses. Using this novel approach, several Fe-Mn deposits at different water depths from the western Pacific Ocean are investigated. Our results indicate that the abundance of AFH increase at a water depth of ∼5000 m, which can be ascribed to bottom-current stratification. The magnetic approach to indirectly quantify the AFH component in Fe-Mn deposits has a great potential in exploring oceanic paleoenvironment significance. © 2021 Elsevier B.V.
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Document Type: 期刊论文
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Affiliation: Centre for Marine Magnetism (CM2), Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen, China; Research School of Earth Sciences, Australian National University, Canberra, Australia; Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Guangzhou, China; National Institute of Polar Research, Tokyo, Japan; Shenzhen Key Laboratory of Marine Archaea Geo-Omics, Southern University of Science and Technology, Shenzhen, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, China; U.S. Geological Survey, PCMSC, 2885 Mission St., Santa Cruz, CA, United States; Guangzhou Marine Geological Survey, Guangzhou, China

Recommended Citation:
Jiang X.,Zhao X.,Zhao X.,et al. A magnetic approach to unravelling the paleoenvironmental significance of nanometer-sized Fe hydroxide in NW Pacific ferromanganese deposits[J]. Earth and Planetary Science Letters,2021-01-01,565
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