globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116400
论文题名:
Ferromagnetic resonance of magnetite biominerals traces redox changes
作者: Blattmann T.M.; Lesniak B.; García-Rubio I.; Charilaou M.; Wessels M.; Eglinton T.I.; Gehring A.U.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 545
语种: 英语
中文关键词: anoxia ; eutrophication ; magnetofossil ; magnetotactic bacteria ; redox gradient ; sediment
英文关键词: Biochemical oxygen demand ; Dissolved oxygen ; Eutrophication ; Ferromagnetic materials ; Ferromagnetic resonance ; Ferromagnetism ; Lakes ; Sedimentology ; Sediments ; Biogenic magnetite ; Ferromagnetic resonance spectroscopy ; Magnetite particles ; Magnetotactic Bacteria ; Microbiological process ; Sediment water interface ; Sedimentary records ; Uniaxial anisotropy ; Magnetite ; depositional environment ; ferromanganese deposit ; lacustrine deposit ; magnetite ; redox conditions ; trace element ; trophic level ; Bodensee ; Bacteria (microorganisms)
英文摘要: Redox variations govern a multitude of key geochemical and microbiological processes within lacustrine and marine systems, yet the interpretation of these geological archives can be limited because redox-sensitive microorganisms leave behind sparse fossil evidence. Here, we assess a biologically controlled magnetic proxy through investigation of a well-constrained sedimentary record covering a perturbation of redox-conditions driven by a complete trophic cycle in Lake Constance. Ferromagnetic resonance spectroscopy of sediments reveals strong uniaxial anisotropy, indicative of single-domain magnetite particles in intact or fragmentary chain arrangements, which are an unambiguous trait of magnetotactic bacteria (MTB) and their magnetofossil remains. We show that biogenic magnetite formed intra-cellularly in MTB faithfully records changing redox-conditions at or close to the sediment water-interface. Biogenic magnetite within sedimentary records points to the proliferation of MTB parallel to a decline in water column dissolved oxygen and the formation of sulfidic surface sediments in Lake Constance associated with an episode of eutrophication (1955–1991). We conclude that magnetofossils may serve as a sensitive geological proxy to reconstruct dynamic redox-changes along the sediment-water interface and bottom waters. © 2020 The Authors
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被引频次[WOS]:9   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164876
Appears in Collections:气候变化与战略

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作者单位: Biogeochemistry Research Center, JAMSTEC, Yokosuka, 237-0061, Japan; Geological Institute, ETH Zurich, Zurich, 8092, Switzerland; Institute of Geophysics, ETH Zurich, Zurich, 8092, Switzerland; Laboratory of Physical Chemistry, ETH Zurich, Zurich, 8093, Switzerland; Centro Universitario de la Defensa, Zaragoza, 50090, Spain; Department of Physics, University of Louisiana at Lafayette, Lafayette, LA 70504, United States; Institut für Seenforschung, Landesanstalt für Umwelt Baden-Württemberg, Langenargen88085, Germany

Recommended Citation:
Blattmann T.M.,Lesniak B.,García-Rubio I.,et al. Ferromagnetic resonance of magnetite biominerals traces redox changes[J]. Earth and Planetary Science Letters,2020-01-01,545
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