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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
	Jiang X.; Zhao X.; Zhao X.; Chou Y.-M.; Hein J.R.; Sun X.; Zhong Y.; Ren J.; Liu Q.
发表日期	2021
ISSN	0012821X
卷号	565
英文摘要	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.
关键词	amorphous Fe-hydroxides Fe-Mn nodules and crusts superparamagnetism temperature dependence of magnetic susceptibility
英文关键词	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
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203152
作者单位	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
推荐引用方式 GB/T 7714	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],2021,565.
APA	Jiang X..,Zhao X..,Zhao X..,Chou Y.-M..,Hein J.R..,...&Liu Q..(2021).A magnetic approach to unravelling the paleoenvironmental significance of nanometer-sized Fe hydroxide in NW Pacific ferromanganese deposits.Earth and Planetary Science Letters,565.
MLA	Jiang X.,et al."A magnetic approach to unravelling the paleoenvironmental significance of nanometer-sized Fe hydroxide in NW Pacific ferromanganese deposits".Earth and Planetary Science Letters 565(2021).