Ferromanganese crusts from the Sea of Okhotsk

New data on the microstructures and the mineral and chemical compositions of ferromanganese crusts obtained from the western slope of the Kuril Island Arc in the Sea of Okhotsk during cruises of the R/V Vulkanolog are discussed. The study of the crusts using analytical electron microscopy methods re...

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Bibliographic Details
Published in:Oceanology (Washington. 1965) 2012-02, Vol.52 (1), p.88-100
Main Authors: Baturin, G. N., Dubinchuk, V. T., Rashidov, V. A.
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemical analysis
Earth and Environmental Science
Earth Sciences
Island arcs
Manganese
Marine
Marine Geology
Montmorillonite
Morphology
Oceanography
Rare earth elements
Seismology
Trace elements
Volcanology
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Summary:New data on the microstructures and the mineral and chemical compositions of ferromanganese crusts obtained from the western slope of the Kuril Island Arc in the Sea of Okhotsk during cruises of the R/V Vulkanolog are discussed. The study of the crusts using analytical electron microscopy methods revealed that their manganese phase is represented by vernadite, Fe-vernadite, todorokite, asbolane, and asbolane-buserite, while the iron phase consists of hematite, hydrohematite, ferroxyhite, and magnetite. The assemblage of lithic minerals includes apatite, quartz, epidote, and montmorillonite. According to the chemical analysis, most of the crusts contain a significant share of volcanogenic and hydrothermal material, which is evident from the elevated values of the Mn and Ti modules, the low concentrations of some trace elements, and the positive Eu anomaly in the rare earth elements composition.
ISSN:0001-4370
1531-8508
DOI:10.1134/S0001437012010031