Ferromagnetic resonance of magnetite biominerals traces redox changes
Blattmann, Thomas M. ; Lesniak, Barbara ; García-Rubio, Inés (Universidad de Zaragoza) ; Charilaou, Michalis ; Wessels, Martin ; Eglinton, Timothy I. ; Gehring, Andreas U.
Resumen: 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.
Idioma: Inglés
DOI: 10.1016/j.epsl.2020.116400
Año: 2020
Publicado en: Earth and Planetary Science Letters 545 (2020), 116400 1-7
ISSN: 0012-821X
Factor impacto JCR: 5.255 (2020)
Categ. JCR: GEOCHEMISTRY & GEOPHYSICS rank: 7 / 87 = 0.08 (2020) - Q1 - T1
Factor impacto SCIMAGO: 2.829 - Earth and Planetary Sciences (miscellaneous) (Q1) - Space and Planetary Science (Q1) - Geophysics (Q1) - Geochemistry and Petrology (Q1)
Financiación: info:eu-repo/grantAgreement/ES/DGA/E35-17R
Financiación: info:eu-repo/grantAgreement/ES/MINECO/CTQ2015-64486-R
Tipo y forma: Article (Published version)
Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)
You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. You may not use the material for commercial purposes. If you remix, transform, or build upon the material, you may not distribute the modified material.
Exportado de SIDERAL (2021-09-02-09:48:13)
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Idioma: Inglés
DOI: 10.1016/j.epsl.2020.116400
Año: 2020
Publicado en: Earth and Planetary Science Letters 545 (2020), 116400 1-7
ISSN: 0012-821X
Factor impacto JCR: 5.255 (2020)
Categ. JCR: GEOCHEMISTRY & GEOPHYSICS rank: 7 / 87 = 0.08 (2020) - Q1 - T1
Factor impacto SCIMAGO: 2.829 - Earth and Planetary Sciences (miscellaneous) (Q1) - Space and Planetary Science (Q1) - Geophysics (Q1) - Geochemistry and Petrology (Q1)
Financiación: info:eu-repo/grantAgreement/ES/DGA/E35-17R
Financiación: info:eu-repo/grantAgreement/ES/MINECO/CTQ2015-64486-R
Tipo y forma: Article (Published version)
Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)
You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. You may not use the material for commercial purposes. If you remix, transform, or build upon the material, you may not distribute the modified material. Exportado de SIDERAL (2021-09-02-09:48:13)
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Record created 2020-08-11, last modified 2021-09-02