title: Authigenesis of carbonates in the deposits of the gas-hydrate-bearing structure of the CHAOS (Sea of Okhotsk)
metadata.name: dc.contributor.author
metadata.value: Logvina, Elizaveta A.
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Krylov, Aleksey A.
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Matveeva, Tatyana V.
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Maksimov, Fedor E.
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Kuznetsov, Vladislav Yu.
metadata.lang: -
metadata.name: dc.date.accessioned
metadata.value: 2022-10-03T12:46:34Z
metadata.lang: -
metadata.name: dc.date.available
metadata.value: 2022-10-03T12:46:34Z
metadata.lang: -
metadata.name: dc.date.issued
metadata.value: 2022-03
metadata.lang: -
metadata.name: dc.identifier.citation
metadata.value: Logvina, E. A., Krylov, A. A., Matveeva, T. V., Maksimov, F. E., Kuznetsov, V. Yu. (2022). Authigenesis of carbonates in the deposits of the gas-hydrate-bearing structure of the CHAOS (Sea of Okhotsk). Vestnik of Saint Petersburg University. Earth Sciences, 67 (1), 50–73. https://doi.org/10.21638/spbu07.2022.103 (In Russian)
metadata.lang: en_GB
metadata.name: dc.identifier.other
metadata.value: https://doi.org/10.21638/spbu07.2022.103
metadata.lang: -
metadata.name: dc.identifier.uri
metadata.value: http://hdl.handle.net/11701/38049
metadata.lang: -
metadata.name: dc.description.abstract
metadata.value: The paper presents the results of studies of authigenic carbonates sampled in the near-surface
  sediments of the gas-hydrate-bearing CHAOS structure located on the western slope of
  the Deryugin Basin in the Sea of Okhotsk. Carbonates were at different stages of formation,
  the most common morphological forms of which were concretions. Microscopic studies have
  shown that the concretions are formed by pelitomorphic carbonate cementing the terrigenous
  clay-clastic matrix and organic detritus. According to X-ray phase analysis, the dominant
  mineral composing nodules is cryptocrystalline high-Mg calcite (14.2–16.9 mol % Mg). Based
  on the geochemical modeling the intervals of the sediments with favorable conditions for
  the formation of basic carbonate minerals (aragonite, calcite, and dolomite) were identified.
  Almost over the entire area of the structure, the formation of carbonates occurs at more than
  1m and up to 5m sub-bottom depths. In the central part of the structure (station LV31–27GC)
  the formation of carbonates is also possible in the upper part of the sedimentary section —
  from 0 to 1.5 m. On the basis of balance calculations of the δ13C isotopes content in nodules,
  the contribution of the main carbon sources involved in their formation was estimated. These
  sources turned out to be organic matter and microbial methane in a ratio of 67.5 : 32.5. It was
  found that the conversion of carbon dioxide into bicarbonate ion occurs under conditions of
  early diagenesis due to the interaction of the fluid with aluminosilicates. Calculations of the
  isotopic composition of pore waters (the main source of oxygen in carbonates) and paleotemperatures
  indicate crystallization of carbonates at low (close to 0 °C) temperatures. Based
  on 230Th/U-dating of carbonates, the age of the studied unloading source was determined as ~3.5 thousand years. It was found that the CHAOS structure is one of the “youngest” on the
  northeastern slope of the Sakhalin Island.
metadata.lang: en_GB
metadata.name: dc.description.sponsorship
metadata.value: This work was supported by the Russian Science Foundation (grant No. 19-17-00226 «Reconstruction
  of the mechanisms of the formation of problematic authigenic carbonates in diagenetic and catagenetic
  environments associated with the generation / oxidation of hydrocarbons».
metadata.lang: en_GB
metadata.name: dc.language.iso
metadata.value: ru
metadata.lang: en_GB
metadata.name: dc.publisher
metadata.value: St Petersburg State University
metadata.lang: en_GB
metadata.name: dc.relation.ispartofseries
metadata.value: Vestnik of St Petersburg University. Earth Sciences;Volume 67; Issue 1
metadata.lang: -
metadata.name: dc.subject
metadata.value: authigenic carbonates
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: diagenesis
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: source of fluid discharge
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: gas hydrates
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: methane
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: organic matter
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: isotope analysis
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: dating
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: hydrochemical modeling
metadata.lang: en_GB
metadata.name: dc.title
metadata.value: Authigenesis of carbonates in the deposits of the gas-hydrate-bearing structure of the CHAOS (Sea of Okhotsk)
metadata.lang: en_GB
metadata.name: dc.type
metadata.value: Article
metadata.lang: en_GB
resources.filename: 03.pdf
resources.url: https://dspace.spbu.ru/bitstream/11701/38049/1/03.pdf
resources.format: Adobe PDF
resources.size: 5,43 MB