title: Ferro-manganese nodules from the Kara Sea: Mineralogy, geochemistry and genesis
metadata.name: dc.contributor.author
metadata.value: Худолей, Андрей Константинович
metadata.lang: -
metadata.name: dc.date.accessioned
metadata.value: 2020-09-08T16:18:26Z
metadata.lang: -
metadata.name: dc.date.available
metadata.value: 2020-09-08T16:18:26Z
metadata.lang: -
metadata.name: dc.date.issued
metadata.value: 2019
metadata.lang: -
metadata.name: dc.identifier.uri
metadata.value: http://hdl.handle.net/11701/19278
metadata.lang: -
metadata.name: dc.description.abstract
metadata.value: Sixteen ferromanganese nodules collected from a large area in the Kara Sea were studied by optical and scanning
  electron microscopy, X-ray powder diffraction, X-ray fluorescence analysis, inductively coupled plasma mass
  spectrometry, and electron microprobe analysis. The geological setting, chemical and mineralogical features
  suggest that Fe-Mn concretions of the Kara Sea mainly were formed by diagenetic process, while hydrogenetic
  process is secondary if present. The studied nodules are characterized by the alternation of Mn- and Fe-P-enriched
  laminae. The Fe-P-rich laminae are almost completely composed of an amorphous phase under X-ray. We
  consider that the phosphatization process did not occur during formation of the Fe-Mn crusts and nodules from
  the Kara Sea. Several Mn-bearing phases are present in the studied samples (buserite-1, birnessite and X-ray
  amorphous phase). All studied nodules have similar contents of the main chemical elements. In all cases, the
  samples are depleted in light REE, enriched in heavy REE, and have negative Ce and Y anomalies. Our data
  indicate that diagenetic crusts and nodules differ significantly in terms of chemical composition from other types
  of Fe-Mn concretions. Based on their Co, Ni, Cu, Ce, Zr and Mo contents, we could differentiate diagenetic
  concretions from hydrogenetic and hydrothermal (both high and low-temperature) concretions.
metadata.lang: en_GB
metadata.name: dc.language.iso
metadata.value: en
metadata.lang: en_GB
metadata.name: dc.publisher
metadata.value: Elsevier
metadata.lang: en_GB
metadata.name: dc.title
metadata.value: Ferro-manganese nodules from the Kara Sea: Mineralogy, geochemistry and genesis
metadata.lang: en_GB
metadata.name: dc.type
metadata.value: Article
metadata.lang: en_GB
resources.filename: Vereshchagin-et-al-2019-OGR.pdf
resources.url: https://dspace.spbu.ru/bitstream/11701/19278/1/Vereshchagin-et-al-2019-OGR.pdf
resources.format: Adobe PDF
resources.size: 11,12 MB