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  • Archive of Ocean Data; ARCOD  (9)
  • PANGAEA  (9)
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  • PANGAEA  (9)
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  • 1
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    Results of biogeochemical studies in the Russian Arctic seas: isotope and radioisotope data (2012)
    PANGAEA
    In:  Supplement to: Lein, Alla Yu; Kravchishina, Marina D; Politova, Nadezhda V; Savvichev, Alexander S; Veslopolova, E F; Mitskevich, Irina N; Ul'yanova, Nina V; Shevchenko, Vladimir P; Ivanov, Mikhail V (2012): Transformation of particulate organic matter at the water-bottom boundary in the Russian Arctic seas: Evidence from isotope and radioisotope data. Translated from Litologiya i Poleznye Iskopaemye, 2012, 2, 115-145, Lithology and Mineral Resources, 47(2), 99-128, https://doi.org/10.1134/S0024490212020034
    Details
    Publication Date: 2023-03-16
    Description: Comprehensive biogeochemical studies including determination of isotopic composition of organic carbon in both suspended matter and surface layer (0-1 cm) bottom sediments (more than 260 determinations of d13C-Corg) were carried out for five Arctic shelf seas: White, Barents, Kara, East Siberian, and Chukchi Seas. The aim of this study is to elucidate causes that change isotopic composition of particulate organic carbon at the water-sediment boundary. It is shown that isotopic composition of organic carbon in sediments from seas with high river run-off (White, Kara, and East Siberian Seas) does not inherit isotopic composition of organic carbon in particles precipitating from the water column, but is enriched in 13C. Seas with low river run-off (Barents and Chukchi Seas) show insignificant difference between d13C-Corg values in both suspended load and sediments because of low content of isotopically light allochthonous organic matter in suspended matter. Biogeochemical studies with radioisotope tracers (14CO2, 35S, and 14CH4) revealed existence of specific microbial filter formed from heterotrophic and autotrophic organisms at the water-sediment boundary. This filter prevents mass influx of products of organic matter decomposition into the water column, as well as reduces influx of OM contained in suspended matter from water into sediments.
    Keywords: Archive of Ocean Data; ARCOD
    Type: Dataset
    Format: application/zip, 23 datasets
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    DATA PANGAEA
  • 2
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    Chemical and isotopic compositions of ocean authigenic carbonates
    PANGAEA
    In:  P.P. Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow | Supplement to: Lein, Alla Yu (2004): Authigenic Carbonate Formation in the Ocean. Lithology and Mineral Resources, 39(1), 1-30, https://doi.org/10.1023/B:LIMI.0000010767.52720.8f
    Details
    Publication Date: 2023-05-12
    Description: Oceanic authigenic carbonates are classified according to origin of the carbonate carbon source using a complex methodology that includes methods of sedimentary petrography, mineralogy, isotope geochemistry, and microbiology. Mg-calcite (protodolomite) and aragonite predominate among the authigenic carbonates. All authigenic carbonates are depleted in 13C and enriched in 18O (in PDB system) that indicates biological fractionation of isotopes during carbonate formation. Obtained results show that authigenic carbonate formation is a biogeochemical (microbial) process, which involves carbon from ancient sedimentary rocks, abiogenic methane, and bicarbonate-ion of hydrothermal fluids into the modern carbon cycle.
    Keywords: Archive of Ocean Data; ARCOD
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 3
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    Hydrocarbons in hydrothermal sulfides from the Rainbow Hydrothermal Field
    PANGAEA
    In:  Supplement to: Lein, Alla Yu; Peresypkin, Valery I; Simoneit, Bernd R T (2003): Origin of Hydrocarbons in Hydrothermal Sulfide Ores in the Mid-Atlantic Ridge. Lithology and Mineral Resources, 38(5), 383-393, https://doi.org/10.1023/A:1025525818526
    Details
    Publication Date: 2023-05-12
    Description: The Rainbow Hydrothermal Field (36°N, Mid-Atlantic Ridge) is one of three presently known fields related to serpentinization of ultramafic rocks accompanied by formation of hydrogen- and methane rich solutions. Gas chromatographic and molecular gas chromatographic - mass spectrometric investigations of sulfide ores and sediments from this field confirmed predominantly biological nature of bitumoids related to high-temperature transformation of biomass of the hydrothermal biological community. At the same time ores of the Rainbow field contain significant amounts of compounds that are not directly related to biogenic synthesis. This fact suggests possibility of abiogenic synthesis of methane and even complex hydrocarbons during serpentinization of ultramafic rocks.
    Keywords: Archive of Ocean Data; ARCOD
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 4
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    Biogeochemical parameters and processes in waters and bottom sediments of the Chukchi Sea
    PANGAEA
    In:  Supplement to: Lein, Alla Yu; Savvichev, Alexander S; Rusanov, Igor I; Pavlova, Galina A; Belyaev, Nikolay A; Crane, Kathleen; Pimenov, Nikolay V; Ivanov, Mikhail V (2007): Biogeochemical processes in the Chukchi Sea. Translated from Litologiya i Poleznye Iskopaemye, 2007, 3, 247-266, Lithology and Mineral Resources, 42(3), 221-239, https://doi.org/10.1134/S0024490207030029
    Details
    Publication Date: 2023-05-12
    Description: Study of biogeochemical processes in waters and sediments of the Chukchi Sea in August 2004 revealed atypical maxima of biogenic element (N, P, and Si) concentrations and rate of microbial sulfate reduction in the surface layer (0-3 cm) of marine sediments. The C/N/P ratio in organic matter (OM) of this layer does not fit the Redfield-Richards stoichiometric model. Specific features of biogeochemical processes in the sea are likely related to the complex dynamics of water, high primary produc¬tivity (110-1400 mg C/m**2/day), low depth of the basin (〈50 m for 60% of the water area), reduced food chain due to low population of zooplankton, high density of zoobenthos (up to 4230 g/m**2), and high activity of microbial processes. Drastic decrease in concentrations of biogenic elements, iodine, total alkalinity, and population of microorganisms beneath the 0-3 cm layer testify to large-scale OM decay at the water-seafloor barrier. Our original experimental data support high annual rate of OM mineralization at the bottom of the Chukchi Sea.
    Keywords: Archive of Ocean Data; ARCOD
    Type: Dataset
    Format: application/zip, 5 datasets
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  • 5
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    Mineral and chemical compositions of hydrothermal ores and sediments from the Menez Gwen Hydrothermal Field, Mid-Atlantic Ridge
    PANGAEA
    In:  Supplement to: Lein, Alla Yu; Bogdanov, Yury A; Maslennikov, Valery V; Syaoli, Li; Ul'yanova, Nina V; Maslennikova, S P; Ul'yanov, Alexander A (2010): Sulfide minerals in the Menez Gwen nonmetallic hydrothermal field (Mid-Atlantic Ridge). Translated from Litologiya i Poleznye Iskopaemye, 2010, 4, 343-362, Lithology and Mineral Resources, 45(4), 305-323, https://doi.org/10.1134/S0024490210040012
    Details
    Publication Date: 2023-05-12
    Description: Mineralogy and geochemistry of sulfide-bearing rocks and ores discovered within the Menez Gwen Hydrothermal Field are studied. Samples were taken during Cruise 49 of R/V Akademik Mstislav Keldysh of the p.p. Shirshov Institute of Oceanology. Mineral composition of rocks and ores were studied by traditional methods of optical microscopy, scanning electron microscopy (CAMSCAN), and microprobe analysis (EPMA SX-50). Contents of trace elements were determined by laser ablation inductively coupled plasma - mass spectrometry (LA-ICP-MS). Zn-Cu ore comprises zonal sulfide chimney intergrowths. Numerous Se-rich copper ore fragments occur in volcanomictic layered gritstones and/or barite slabs. Mineral composition, zonality and association of trace elements in ore are typical of black smokers formed at the basalt base near the Azores Triple Junction in the MAR. Obtained results make it possible to reconstruct formation history of the Menez Gwen Hydrothermal Field into the high-temperature (Cu-Se association in ore clasts), medium-temperature (Zn-Cu-As association in ore), and recent (Ba-SiO2 association) stages.
    Keywords: Archive of Ocean Data; ARCOD
    Type: Dataset
    Format: application/zip, 7 datasets
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  • 6
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    Composition of suspended matter, bottom sediments, and interstitial waters from the Caspian Sea (2012)
    PANGAEA
    In:  Supplement to: Lein, Alla Yu; Rusanov, Igor I; Kravchishina, Marina D; Ivanov, Mikhail V (2012): Genesis of organic and carbonate carbon in sediments of the North and Middle Caspian Basins inferred from the isotope data. Translated from Litologiya i Poleznye Iskopaemye, 2012, 4, 319-332, Lithology and Mineral Resources, 47(4), 281-293, https://doi.org/10.1134/S0024490212040050
    Details
    Publication Date: 2023-03-16
    Description: Isotopic compositions of organic (d13C Corg) and carbonate (d13C Ccarb) carbon were analyzed in suspended matter and bottom sediments from the North and Middle Caspian Basins. Isotopic composition of Corg was used for assessing proportions of allochthonous and autochthonous particulate organic matter. Difference between d13C Corg values in surface layer bottom sediments and suspended matter is explained by aerobic and anaerobic diagenetic transformations. Isotopic composition of Corg in bottom sediments may be used as a tool for reconstructing Quaternary transgressive-regressive history of the Caspian Sea.
    Keywords: Archive of Ocean Data; ARCOD
    Type: Dataset
    Format: application/zip, 13 datasets
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  • 7
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    Bitumoids and methane in bottom sediments of the northeast Black Sea
    PANGAEA
    In:  Supplement to: Lein, Alla Yu; Rusanov, Igor I; Pavlova, Galina A; Dara, O M; Verkhovskaya, Z I; Zakharova, E E; Yusupov, Sergey K; Ivanov, Mikhail V (2011): Energy sources for diagenesis: Evidence from the Black Sea. Translated from Litologlya i Poleznye Iskopaemye, 2011, 2, 154-169, Lithology and Mineral Resources, 46(2), 135-150, https://doi.org/10.1134/S0024490211020064
    Details
    Publication Date: 2023-05-12
    Description: Complex investigations of recent and ancient Black Sea sediments from the outer shelf, continental slope, and deep-water basin of the Russian Black Sea sector have been carried out. Samples were collected during Cruise 100 of R/V Professor Shtokman organized by the P.P. Shirshov Institute of Oceanology (March 2009) and expedition of UZHMORGEO (summer 2006). Rates of the main anaerobic processes during diagenesis (sulfate reduction, dark CO2 assimilation, methanogenesis, and methane oxidation) were studied for the first time in sediment cores of the studied area. Two peaks in the rate of microbial processes and two sources of these processes were identified: the upper peak near the water-sediment contact is related to solar energy (OM substrate of the water column) and the lower peak at the base of ancient Black Sea sediments with high(〉1 mmol) methane concentration related to energy of anaerobic methane oxidation. New labile OM formed during this process is utilized by other groups of microorganisms. According to experimental data, daily rate of anaerobic methane oxidation is many times higher than that of methanogenesis, which unambiguously indicates migration nature of the main part of methane.
    Keywords: Archive of Ocean Data; ARCOD
    Type: Dataset
    Format: application/zip, 4 datasets
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  • 8
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    Methane and microbiological processes in the Barents Sea
    PANGAEA
    In:  Supplement to: Lein, Alla Yu; Pimenov, Nikolay V; Rusanov, Igor I; Pavlova, Galina A; Savvichev, Alexander S; Verkhovskaya, Z I (2008): Methane cycle in the Barents Sea. Translated from Litologiya i Poleznyye Iskopaemyye, 2008, 43(5), 455-479, Lithology and Mineral Resources, 43(5), 405-428, https://doi.org/10.1134/S0024490208050015
    Details
    Publication Date: 2023-05-12
    Description: Biogeochemical cycle of methane in the Barents Sea was studied using isotope geochemistry to determine rates of microbial methane oxidation. It was established that microbiological processes (glucose consumption, 14CO2 assimilation, sulfate reduction, and slow methane oxidation) in oxidized surface and weakly reduced sediments are marked by only insignificant change in SO4 concentration and absence of notable increase of total alkalinity and N/NH4 downward sediment cores. Microbial methane productivity was 0.111x10**6 mol/day. Taking into account volume of the water column, microbial methane consumption therein can be as much as 1.8x10**6 mol/day.
    Keywords: Archive of Ocean Data; ARCOD
    Type: Dataset
    Format: application/zip, 8 datasets
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  • 9
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    Chemical composition of White Sea bottom sediments (2009)
    PANGAEA
    In:  P.P. Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow | Supplement to: Kuz'mina, Tatyana G; Lein, Alla Yu; Luchsheva, L N; Murdmaa, Ivar O; Novigatsky, Alexander N; Shevchenko, Vladimir P (2009): Chemical composition of surface sediments of the White Sea. Translated from Litologiya i Poleznyye Iskopaemyye, 2009, 44(2), 115-132, Lithology and Mineral Resources, 44(2), 103-119, https://doi.org/10.1134/S0024490209020011
    Details
    Publication Date: 2023-08-28
    Description: Contents of major elements in surface layer bottom sediments of the White Sea were determined by the X-ray fluorescence method. Application of the statistical analysis (principal component method and cluster analysis) made it possible to divide the sediments into more or less homogeneous seven groups with different chemical and grain size compositions. In general, the groups corresponded to sediment lithotypes based on the classification elaborated at P.P. Shirshov Institute of Oceanology, Russian Academy of Sciences. Contents of Si and Al are controlled by the ratio of sand-silt and pelite grain size fractions, while variations in content of Mn (and Fe in part) are governed by redistribution of elements in the course of redox processes of early diagenesis.
    Keywords: Archive of Ocean Data; ARCOD
    Type: Dataset
    Format: application/zip, 8 datasets
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    DATA PANGAEA
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