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  • 1
    facet.materialart.
    Unknown
    Chemical composition of Fe-Mn manifestations from the Laptev Sea
    PANGAEA
    In:  Supplement to: Kalyagin, A N; Tishchenko, P Ya; Gukov, Aleksander Yu; Volkova, T L; Kurilenko, L N; Chichkin, R V (2001): Nature of ferromanganese formations of the Laptev Sea. Tikhookeanskaya Geologiya (Pacific Geology), 20(2), 87-96
    Details
    Publication Date: 2023-05-12
    Description: In sediments of the Laptev Sea unknown earlier ferromanganese manifestations have been found. On the basis of structural-textural external signs they have been divided to five groups: 1) tube- and spindle-shaped pseudomorphs after and within invertebrates; 2) nuclear and non-nuclear nodules; 3) flagellum- and tube-like skeletons of polychaetes; 4) flat and flattened crustate nodules and crusts; 5) micronodules. All types of ferromanganese manifestations have been sorted in three main genetic series: eigenferrous formations of autochthonous (polychaetes, goethite micronodules) and allochthonous (nuclear nodules) nature; ferromanganese nodules formed under mild hydro-geodynamic conditions at the sediment-seawater geochemical barrier; and ferromanganese manifestations formed under conditions of the variable physico-chemical environment. Ferromanganese manifestations of allochthonous type have signs of littoral zones. They contain both ferrous and ferric iron and have low oxidation degree of manganese in comparison with the autochthonous type manifestations. Manganese minerals with moderate oxidation degree are represented by vernadite and buserite. Such features of iron and manganese indicate different conditions of their formation and occurrence. The main distinctive feature of ferromanganese mineralisation in the Laptev Sea is the redox barrier: the oxidized water layer enriched in oxygen and reduced sediments. This barrier provides favorable conditions for bacterial formation of ferromanganese ores. Understanding of the genesis of ferromanganese manifestations should be found in a study of organic matter reworking by bacteria.
    Keywords: Aluminium oxide; Archive of Ocean Data; ARCOD; Atomic absorption spectrometry (AAS); Calcium oxide; Chromium; Cobalt; Copper; Dunay-97-01; Dunay-97-02; Dunay-97-03; Dunay-97-04; Dunay-97-05; Dunay-97-06; Dunay-97-07; Dunay-97-08; Dunay-97-09; Dunay-97-10; Dunay-97-11; Dunay-97-12; Dunay-97-13; Dunay-97-14; Dunay-97-15; Dunay-97-16; Dunay-97-17; Dunay-97-18; Dunay-97-19; Dunay-97-20; Dunay-97-21; Dunay-97-22; Dunay-97-23; Dunay-97-24; Dunay-97-25; Dunay-97-26; Dunay-97-27; Event label; Flame emission spectrometer Nippon Jarrell ASH AA-780; Grab; GRAB; Iron oxide, Fe2O3; Laptev Sea; Latitude of event; Longitude of event; Magnesium oxide; Manganese dioxide; Nickel; Potassium oxide; Sample code/label; Sample type; Silicon dioxide; Silver; Sodium oxide; Zinc
    Type: Dataset
    Format: text/tab-separated-values, 432 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
    facet.materialart.
    Unknown
    The contribution of organic matter to the alkaline reserve of natural waters (2006)
    Pleiades Publishing, Springer
    In:  Oceanology, 46 (2). pp. 192-199.
    Details
    Publication Date: 2017-02-08
    Description: The contribution of organic matter (humic compounds) to the alkaline reserve of seawater in the Sea of Japan, in the Razdol’naya River estuarine waters, and in the interstitial waters of the sediments of the Sea of Okhotsk was characterized using two procedures for alkalinity measurements: the method by Bruevich and that of the sample equilibrium with air. It was found that the surface waters of the Sea of Japan contained about 20 μmol/kg of alkalinity of organic origin, and this value twofold decreased with depth. For most of the actual cases of the calculations of the seawater carbonate system, this value may be neglected. Meanwhile, the contribution of organic alkalinity to the Razdol’naya River waters amounts to nearly 120 μmol/kg. It was shown that, if this value in the calculation of the carbonate system of the Razdol’naya River estuary-Amur Bay is neglected, this may cause gross errors in the values of the partial pressure of carbon dioxide (the error might be over 1500 μatm) and in the dissolved inorganic carbon (an error over 150 μmol/kg). The maximum absolute contribution of the humic matter (over 300 μmol/kg) was found for the interstitial waters in selected sediments of the Sea of Okhotsk. In the interstitial waters of these sediments, humic matter concentrations as high as 300 mg/l were detected. The data obtained show that the determination of the amount of humic matter must be an indispensable condition for an adequate analysis of estuarine carbonate systems and of the interstitial water in reduced marine sediments.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1134/S0001437006020068
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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