TY - JOUR

T1 - Biogenic Origin of Fe-Mn Crusts from Hydrothermal Fields of the Mid-Atlantic Ridge, Puy de Folles Volcano Region

AU - Sergienko, Elena S.

AU - Tarakhovskaya, Elena R.

AU - Rodinkov, Oleg V.

AU - Yanson, Svetlana Yu.

AU - Pankin, Dmitrii V.

AU - Kozlov, Valery S.

AU - Gareev, Kamil G.

AU - Bugrov, Alexander N.

AU - Kharitonskii, Petr V.

PY - 2024/9/6

Y1 - 2024/9/6

N2 - Ferromanganese formations are widespread in the Earth’s aquatic environment. Of allthe mechanisms of their formation, the biogenic one is the most debatable. Here, we studied theFe-Mn crusts of hydrothermal fields near the underwater volcano Puy de Folles (rift valley of theMid-Atlantic Ridge). The chemical and mineralogical composition (optical and electron microscopywith EDX, X-ray powder diffraction, X-ray fluorescence analysis, Raman and FTIR spectroscopy, gaschromatography—mass spectrometry (GC-MS)) and the magnetic properties (static and resonancemethods, including at cryogenic temperatures) of the samples of Fe-Mn crusts were investigated. Inthe IR absorption spectra, based on hydrogen bond stretching vibrations, it was concluded that therewere compounds with aliphatic (alkane) groups as well as compounds with double bonds (possiblywith a benzene ring). The GC-MS analysis showed the presence of alkanes, alkenes, hopanes, andsteranes. Magnetically, the material is highly coercive; the blocking temperatures are 3 and 13 K.The main carriers of magnetism are ultrafine particles and X-ray amorphous matter. The analysisof experimental data allows us to conclude that the studied ferromanganese crusts, namely in theirferruginous phase, were formed as a result of induced biomineralization with the participation ofiron-oxidizing and iron-reducing bacteria.

AB - Ferromanganese formations are widespread in the Earth’s aquatic environment. Of allthe mechanisms of their formation, the biogenic one is the most debatable. Here, we studied theFe-Mn crusts of hydrothermal fields near the underwater volcano Puy de Folles (rift valley of theMid-Atlantic Ridge). The chemical and mineralogical composition (optical and electron microscopywith EDX, X-ray powder diffraction, X-ray fluorescence analysis, Raman and FTIR spectroscopy, gaschromatography—mass spectrometry (GC-MS)) and the magnetic properties (static and resonancemethods, including at cryogenic temperatures) of the samples of Fe-Mn crusts were investigated. Inthe IR absorption spectra, based on hydrogen bond stretching vibrations, it was concluded that therewere compounds with aliphatic (alkane) groups as well as compounds with double bonds (possiblywith a benzene ring). The GC-MS analysis showed the presence of alkanes, alkenes, hopanes, andsteranes. Magnetically, the material is highly coercive; the blocking temperatures are 3 and 13 K.The main carriers of magnetism are ultrafine particles and X-ray amorphous matter. The analysisof experimental data allows us to conclude that the studied ferromanganese crusts, namely in theirferruginous phase, were formed as a result of induced biomineralization with the participation ofiron-oxidizing and iron-reducing bacteria.

UR - https://www.mendeley.com/catalogue/84187b88-eb29-3658-8fd3-66ac4c895148/

U2 - https://doi.org/10.3390/geosciences14090240

DO - https://doi.org/10.3390/geosciences14090240

M3 - Article

VL - 14

JO - Geosciences (Switzerland)

JF - Geosciences (Switzerland)

SN - 2076-3263

IS - 9

M1 - 240

ER -