Morphology‐Dependent Magnetic Properties in Shallow‐Water Ferromanganese Concretions
Wasiljeff, J., Salminen, J. M., Roberts, A. P., Hu, P., Brown, M., Kuva, J., Lukkari, S., Jolis, E. M., Heinsalu, A., Hong, W., Lepland, A., Suuroja, S., Parkkonen, J., & Virtasalo, J. J. (2024). Morphology‐Dependent Magnetic Properties in Shallow‐Water Ferromanganese Concretions. Geochemistry, Geophysics, Geosystems, 25(5), Article e2023GC011366. https://doi.org/10.1029/2023gc011366
Julkaistu sarjassa
Geochemistry, Geophysics, GeosystemsTekijät
Päivämäärä
2024Tekijänoikeudet
© 2024 The Author(s). Geochemistry, Geophysics, Geosystems published by
Wiley Periodicals LLC on behalf of American Geophysical Union.
Ferromanganese concretions commonly occur in shallow-water coastal regions worldwide. In the Baltic Sea, they can record information about past and present underwater environments and could be a potential source for critical raw materials. We report on their microstructural characteristics and magnetic properties and link them to their formation mechanisms and environmental significance. Microstructural investigations from nano- and micro-computed tomography, electron microscopy, and micro-X-ray fluorescence elemental mapping reveal diverse growth patterns within concretions of different morphologies. Alternating Fe- and Mn-rich growth bands indicate fluctuating redox conditions during formation. Bullet-shaped magnetofossils, produced by magnetotactic bacteria, are present, which suggests the influence of bacterial activity on concretion formation. Spheroidal concretions, which occur in deeper and more tranquil environments, have enhanced microbial biomineralization and magnetofossil preservation. Conversely, crusts and discoidal concretions from shallower and more energetic environments contain fewer magnetofossils and have a greater detrital content. Our results provide insights into concretion formation mechanisms and highlight the importance of diagenetic processes, oxygen availability, and bacterial activity in the Baltic Sea.
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Julkaisija
Wiley-BlackwellISSN Hae Julkaisufoorumista
1525-2027Julkaisu tutkimustietojärjestelmässä
https://converis.jyu.fi/converis/portal/detail/Publication/213715069
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This work was supported by the Research Council of Finland (Fermaid project, Grant 332249), and the Australian Research Council (DP200100765). W.‐L.H. acknowledges financial support from the Swedish Research Council, Vetenskapsrådet (VR), through the project “Cyrosphere‐driven submarine groundwater in the Arctic” (Project No: 2021‐04962). A.H. was supported by Estonian Research Council Grant PRG1993. Part of this work was performed as a Visiting Fellow at the Institute for Rock Magnetism (IRM), University of Minnesota. The IRM is a U.S. National Multi‐user Facility supported through the Instrumentation and Facilities program of the National Science Foundation (NSF EAR‐2153786), and by funding from the University of Minnesota. This study also used research facilities provided by the Finnish Marine Research Infrastructure (FINMARI) network and micro‐XRF by the Research Council of Finland via the RAMI infrastructure project (Grant 337560). Geochemistry, Geophysics, Geosystems 10.1029/2023GC011366WASILJEFFET AL.18 of 21 ...Lisenssi
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