(Table 1) Mn, Fe, TOC and CaCO3 concentrations in bottom sediments and silt waters of Kandalaksha Bay, White Sea
The redox stratification of bottom sediments in Kandalaksha Bay, White Sea, is characterized by elevated concentrations of Mn (3-5%) and Fe (7.5%) in the uppermost layer, which is two orders of magnitude and one and a half times, respectively, higher than the average concentrations of these elements...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.792621 2023-05-15T18:43:50+02:00 (Table 1) Mn, Fe, TOC and CaCO3 concentrations in bottom sediments and silt waters of Kandalaksha Bay, White Sea Rozanov, Alexander G Volkov, Igor I MEDIAN LATITUDE: 66.395250 * MEDIAN LONGITUDE: 34.405667 * SOUTH-BOUND LATITUDE: 65.976500 * WEST-BOUND LONGITUDE: 33.664000 * NORTH-BOUND LATITUDE: 66.656833 * EAST-BOUND LONGITUDE: 35.533667 * DATE/TIME START: 2002-09-11T00:00:00 * DATE/TIME END: 2002-09-16T00:00:00 * MINIMUM DEPTH, sediment/rock: 0.0050 m * MAXIMUM DEPTH, sediment/rock: 3.8500 m 2009-10-16 text/tab-separated-values, 836 data points https://doi.pangaea.de/10.1594/PANGAEA.792621 https://doi.org/10.1594/PANGAEA.792621 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.792621 https://doi.org/10.1594/PANGAEA.792621 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Rozanov, Alexander G; Volkov, Igor I (2009): Bottom sediments of Kandalaksha Bay in the White Sea: the phenomenon of Mn. Geochemistry International, 47(10), 1004-1020, https://doi.org/10.1134/S001670290910005X Archive of Ocean Data ARCOD Calcium carbonate Carbon organic total Carbon analyser AN-7529 7560 Depth bottom/max sediment/rock top/min Ekolog Ekolog-2002 Ekolog-2002-3 Ekolog-2002-58 Ekolog-2002-59 Event label Grab Iron Iron 2+ Iron II ferrous iron Iron III ferric iron Lithology/composition/facies Manganese Method comment MULT Multiple investigations Professor Shtokman PSh55 PSh55-4931 PSh55-4932 PSh55-4933 PSh55-4934 PSh55-4937 Water content wet mass White Sea Dataset 2009 ftpangaea https://doi.org/10.1594/PANGAEA.792621 https://doi.org/10.1134/S001670290910005X 2023-01-20T08:56:22Z The redox stratification of bottom sediments in Kandalaksha Bay, White Sea, is characterized by elevated concentrations of Mn (3-5%) and Fe (7.5%) in the uppermost layer, which is two orders of magnitude and one and a half times, respectively, higher than the average concentrations of these elements in the Earth's crust. The high concentrations of organic matter (Corg = 1-2%) in these sediments cannot maintain (because of its low reaction activity) the sulfate-reducing process (the concentration of sulfide Fe is no higher than 0.6%). The clearest manifestation of diagenesis is the extremely high Mn2+ concentration in the silt water (>500 µM), which causes its flux into the bottom water, oxidation in contact with oxygen, and the synthesis of MnO2 oxy-hydroxide enriching the surface layer of the sediments. Such migrations are much less typical of Fe. Upon oxygen exhaustion in the uppermost layer of the sediments, the synthesized oxyhydroxides (MnO2 and FeOOH) serve as oxidizers of organic matter during anaerobic diagenesis. The calculated diffusion-driven Mn flux from the sediments (280 µM/m**2 day) and corresponding amount of forming Mn oxyhydrate as compared to opposite oxygen flux to sediments (1-10 mM/m**2 day) indicates that >10% organic matter in the surface layer of the sediments can be oxidized with the participation of MnO2. The roles of other oxidizers of organic matter (FeOOH and SO4**2-) becomes discernible at deeper levels of the sediments. The detailed calculation of the balance of reducing processes testifies to the higher consumption of organic matter during the diagenesis of surface sediments than it follows from the direct determination of Corg. The most active diagenetic redox processes terminate at depths of 25-50 cm. Layers enriched in Mn at deeper levels are metastable relicts of its surface accumulation and are prone to gradual dissemination. Dataset White Sea PANGAEA - Data Publisher for Earth & Environmental Science Kandalaksha ENVELOPE(32.417,32.417,67.133,67.133) White Sea ENVELOPE(33.664000,35.533667,66.656833,65.976500) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Archive of Ocean Data ARCOD Calcium carbonate Carbon organic total Carbon analyser AN-7529 7560 Depth bottom/max sediment/rock top/min Ekolog Ekolog-2002 Ekolog-2002-3 Ekolog-2002-58 Ekolog-2002-59 Event label Grab Iron Iron 2+ Iron II ferrous iron Iron III ferric iron Lithology/composition/facies Manganese Method comment MULT Multiple investigations Professor Shtokman PSh55 PSh55-4931 PSh55-4932 PSh55-4933 PSh55-4934 PSh55-4937 Water content wet mass White Sea |
spellingShingle |
Archive of Ocean Data ARCOD Calcium carbonate Carbon organic total Carbon analyser AN-7529 7560 Depth bottom/max sediment/rock top/min Ekolog Ekolog-2002 Ekolog-2002-3 Ekolog-2002-58 Ekolog-2002-59 Event label Grab Iron Iron 2+ Iron II ferrous iron Iron III ferric iron Lithology/composition/facies Manganese Method comment MULT Multiple investigations Professor Shtokman PSh55 PSh55-4931 PSh55-4932 PSh55-4933 PSh55-4934 PSh55-4937 Water content wet mass White Sea Rozanov, Alexander G Volkov, Igor I (Table 1) Mn, Fe, TOC and CaCO3 concentrations in bottom sediments and silt waters of Kandalaksha Bay, White Sea |
topic_facet |
Archive of Ocean Data ARCOD Calcium carbonate Carbon organic total Carbon analyser AN-7529 7560 Depth bottom/max sediment/rock top/min Ekolog Ekolog-2002 Ekolog-2002-3 Ekolog-2002-58 Ekolog-2002-59 Event label Grab Iron Iron 2+ Iron II ferrous iron Iron III ferric iron Lithology/composition/facies Manganese Method comment MULT Multiple investigations Professor Shtokman PSh55 PSh55-4931 PSh55-4932 PSh55-4933 PSh55-4934 PSh55-4937 Water content wet mass White Sea |
description |
The redox stratification of bottom sediments in Kandalaksha Bay, White Sea, is characterized by elevated concentrations of Mn (3-5%) and Fe (7.5%) in the uppermost layer, which is two orders of magnitude and one and a half times, respectively, higher than the average concentrations of these elements in the Earth's crust. The high concentrations of organic matter (Corg = 1-2%) in these sediments cannot maintain (because of its low reaction activity) the sulfate-reducing process (the concentration of sulfide Fe is no higher than 0.6%). The clearest manifestation of diagenesis is the extremely high Mn2+ concentration in the silt water (>500 µM), which causes its flux into the bottom water, oxidation in contact with oxygen, and the synthesis of MnO2 oxy-hydroxide enriching the surface layer of the sediments. Such migrations are much less typical of Fe. Upon oxygen exhaustion in the uppermost layer of the sediments, the synthesized oxyhydroxides (MnO2 and FeOOH) serve as oxidizers of organic matter during anaerobic diagenesis. The calculated diffusion-driven Mn flux from the sediments (280 µM/m**2 day) and corresponding amount of forming Mn oxyhydrate as compared to opposite oxygen flux to sediments (1-10 mM/m**2 day) indicates that >10% organic matter in the surface layer of the sediments can be oxidized with the participation of MnO2. The roles of other oxidizers of organic matter (FeOOH and SO4**2-) becomes discernible at deeper levels of the sediments. The detailed calculation of the balance of reducing processes testifies to the higher consumption of organic matter during the diagenesis of surface sediments than it follows from the direct determination of Corg. The most active diagenetic redox processes terminate at depths of 25-50 cm. Layers enriched in Mn at deeper levels are metastable relicts of its surface accumulation and are prone to gradual dissemination. |
format |
Dataset |
author |
Rozanov, Alexander G Volkov, Igor I |
author_facet |
Rozanov, Alexander G Volkov, Igor I |
author_sort |
Rozanov, Alexander G |
title |
(Table 1) Mn, Fe, TOC and CaCO3 concentrations in bottom sediments and silt waters of Kandalaksha Bay, White Sea |
title_short |
(Table 1) Mn, Fe, TOC and CaCO3 concentrations in bottom sediments and silt waters of Kandalaksha Bay, White Sea |
title_full |
(Table 1) Mn, Fe, TOC and CaCO3 concentrations in bottom sediments and silt waters of Kandalaksha Bay, White Sea |
title_fullStr |
(Table 1) Mn, Fe, TOC and CaCO3 concentrations in bottom sediments and silt waters of Kandalaksha Bay, White Sea |
title_full_unstemmed |
(Table 1) Mn, Fe, TOC and CaCO3 concentrations in bottom sediments and silt waters of Kandalaksha Bay, White Sea |
title_sort |
(table 1) mn, fe, toc and caco3 concentrations in bottom sediments and silt waters of kandalaksha bay, white sea |
publisher |
PANGAEA |
publishDate |
2009 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.792621 https://doi.org/10.1594/PANGAEA.792621 |
op_coverage |
MEDIAN LATITUDE: 66.395250 * MEDIAN LONGITUDE: 34.405667 * SOUTH-BOUND LATITUDE: 65.976500 * WEST-BOUND LONGITUDE: 33.664000 * NORTH-BOUND LATITUDE: 66.656833 * EAST-BOUND LONGITUDE: 35.533667 * DATE/TIME START: 2002-09-11T00:00:00 * DATE/TIME END: 2002-09-16T00:00:00 * MINIMUM DEPTH, sediment/rock: 0.0050 m * MAXIMUM DEPTH, sediment/rock: 3.8500 m |
long_lat |
ENVELOPE(32.417,32.417,67.133,67.133) ENVELOPE(33.664000,35.533667,66.656833,65.976500) |
geographic |
Kandalaksha White Sea |
geographic_facet |
Kandalaksha White Sea |
genre |
White Sea |
genre_facet |
White Sea |
op_source |
Supplement to: Rozanov, Alexander G; Volkov, Igor I (2009): Bottom sediments of Kandalaksha Bay in the White Sea: the phenomenon of Mn. Geochemistry International, 47(10), 1004-1020, https://doi.org/10.1134/S001670290910005X |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.792621 https://doi.org/10.1594/PANGAEA.792621 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.792621 https://doi.org/10.1134/S001670290910005X |
_version_ |
1766234343999537152 |