Specific features of the distribution of trace and rare earth elements in recent bottom sediments in the lower course of the Severnaya Dvina River and White Sea     

A. V. Maslov  V. P. Shevchenko  V. N. Podkovyrov  Yu. L. Ronkin  O. P. Lepikhina  A. N. Novigatsky  A. S. Filippov  N. V. Shevchenko 《Lithology and Mineral Resources》2014,49(6):433-460

The paper discusses results of the lithogeochemical examination of recent bottom sediments in the lower course of the Severnaya Dvina River and White Sea. It has been established that the average concentration of several trace elements (Hf, Sc, Co, Y, Ni, V, Cr, Zr, Ba, and others) therein correlates with the content of the silt-pelite fraction. Maximal concentrations of the majority of above elements are confined to the silty-clayey sediments at the Basin/Dvina Bay boundary. They localized near the coastal zone only for some clastophile (Zr, Cr, and others). Typical values of the hydrolyzate module, chemical index of alteration, and Al₂O₃/SiO₂ ratio in the aleuropelitic and pelitic sediments of the Severnaya Dvina River delta, Dvina Bay, and the Dvina Bay Basin boundary suggest that these sediments are confined to sufficiently cold climate settings. Data points of sediment composition in discriminant paleotectonic diagrams are scattered over a large field probably due to high contents of the weakly weathered plagioclases, micas, and amphiboles, as well as the hydrogenic process promoting the accumulation of Fe and Mn. The PAAS-normalized spectra of rare earth elements (REE) in bottom sediments of the Pinega and Severnaya Dvina rivers, marginal filter of the latter river, Dvina Bay, and the Dvina Bay Basin boundary are similar to the REE distribution in clayey rocks of the ancient platform cover (except for a slight positive Eu anomaly). The REE systematics and distribution pattern of compositional data points of recent bottom sediments in the Gd_N/Yb_N-Eu/Eu* and Eu/Eu*-Cr/Th diagrams and values of several indicator ratios of trace elements suggest that the studied rocks were formed by the mixing of clastic materials from geochemically contrast provenances: northwestern provenance (Kola-Karelia geoblock), which is mostly composed of the Archean and Early Proterozoic crystalline complexes, and the southeastern provenance (northwestern periphery of the Mezen syncline), which is almost totally composed of Phanerozoic sedimentary rocks. The latter provenance likely played a crucial role in the geochemical signature of recent bottom sediments over a significant area of the White Sea.  相似文献   

Observations of atmospheric methane and its stable isotope ratio (δ<Superscript>13</Superscript>C) over the Russian Arctic seas from ship cruises in the summer and autumn of 2015     

A. I. Skorokhod  N. V. Pankratova  I. B. Belikov  R. L. Thompson  A. N. Novigatsky  G. S. Golitsyn 《Doklady Earth Sciences》2016,470(2):1081-1085

The results of experimental measurements of atmospheric methane concentrations and its isotopic composition in the Russian Arctic seas in the summer and autumn of 2015 are discussed. The Keeling plot method and inverse number simulation were used for revealing the factors responsible for elevated methane concentrations over the sea surface. Its maximum concentrations (up to 2050 ppb) were measured over the Kara and Laptev seas, as well as in the port area of Arkhangel’sk. It is shown that tundra and bog ecosystems of Siberia serve as the main sources of methane in the measurement zone (except for the area adjacent to large ports). As a whole, the share of methane from microbiological sources is as high as approximately 43% of the total methane concentrations along the ship route.  相似文献   

The MSL-110 small sediment trap     

V. N. Lukashin  A. A. Klyuvitkin  A. P. Lisitzin  A. N. Novigatsky 《Oceanology》2011,51(4):699-703

A simple construction of the MSL-110 sediment trap developed at the Laboratory of Physical-Geological Research of the Shirshov Institute of Oceanology, Russian Academy of Sciences, is presented. The trap is easily assembled from standard parts available at stores. The trap is easy to use, reliable, and inexpensive. It is applied for determination of sedimentary matter fluxes and their components in water columns of seas, lakes, and other water reservoirs.  相似文献   

Vertical flux of phytoplankton and particulate matter in the White Sea according to the long-term exposure of sediment traps     

L. V. Ilyash  I. G. Radchenko  A. N. Novigatsky  A. P. Lisitzin  V. P. Shevchenko 《Oceanology》2013,53(2):192-199

The vertical fluxes of phytoplankton (VF_Phyto) and particulate organic carbon (VF_POC) in the White Sea were determined using seven long-term (292 to 296 days) sediment traps moored at five stations at 67–255 m depths. The annual VF_Phyto and VF_POC ranged from 0.55 to 24.64 g C/m² and from 3.7 to 93.9 g C/m², respectively. The highest VFPhyto was observed in the Basin region located close to the Gorlo along the Tersk coast. The algal biomass accounted for 15–43% of the VF_POC. Diatoms comprised the most important group, accounting for 83–100% in the sedimented biomass. Thalassiosira nordenskioeldii dominated in the VF_Phyto at all the stations except for the station in the basin close to Onega Bay, where Ditylum brightwellii was the most abundant.  相似文献   

Partitioning of trace elements in the process of early diagenesis of bottom sediments in the White Sea     

L. L. Demina  D. F. Bud’ko  T. N. Alekseeva  A. N. Novigatsky  A. S. Filippov  A. I. Kochenkova 《Geochemistry International》2017,55(1):144-149

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Vertical Fluxes of Suspended Sedimentary Matter in Arctic Sedimentogenesis of Intracontinental Seas     

Novigatsky  A. N.  Lisitzin  A. P.  Klyuvitkin  A. A.  Shevchenko  V. P.  Kravchishina  M. D.  Politova  N. V. 《Doklady Earth Sciences》2018,479(1):384-389

Doklady Earth Sciences - Based on long-term studies of a small sea in the Arctic Ocean, new regularities in the sedimentary process under the conditions of Arctic sedimentogenesis were established....  相似文献   

Internal Tides in the Denmark Strait     

Morozov  E. G.  Frey  D. I.  Gladyshev  S. V.  Klyuvitkin  A. A.  Novigatsky  A. N. 《Izvestiya Atmospheric and Oceanic Physics》2019,55(3):295-302

Izvestiya, Atmospheric and Oceanic Physics - Six-day temperature records carried out at the three mooring levels revealed isotherm fluctuations in the Denmark Strait sill in July 2018 caused by...  相似文献   

Hydrothermal Mineral Assemblages at 71° N of the Mid-Atlantic Ridge (First Results)     

Kravchishina  M. D.  Lein  A. Yu.  Boev  A. G.  Prokofiev  V. Yu.  Starodymova  D. P.  Dara  O. M.  Novigatsky  A. N.  Lisitzin  A. P. 《Oceanology》2019,59(6):941-959

Oceanology - The article discusses the preliminary results of plume and bottom sediment studies of the Trollveggen hydrothermal vent field based on data from cruise 68 of the R/V Akademik Mstislav...  相似文献   

Phosphatized calcareous conglomerate from the Kara Sea floor     

G. N. Baturin  V. T. Dubinchuk  B. G. Pokrovsky  A. N. Novigatsky  O. B. Dmitrenko  N. S. Oskina 《Oceanology》2016,56(5):690-701

Trawling of the bottom in the northeastern Kara Sea during cruise 125 of the R/V Professor Shtokman in 2013 recovered a block of cavernous, partly phosphatized carbonate rock consisting of biogenic carbonate material and partly crystallized diagenetic calcite. The fauna remains are mainly Oligocene–Pliocene planktonic and benthic foraminifers, with less common Oligocene–Miocene coccoliths and single wormlike organisms. Part of the phosphatized material in caverns is impregnated by manganese and iron oxides and enriched in heavy and trace metals. According to the oxygen isotopic composition, this rock formed under moderate temperature conditions. In terms of morphology, mineralogy, and the abundance of organic remains, the block is comparable to methanogenic carbonates found in other parts of the ocean, but shows no isotopically light carbon signatures typical of methane activity. This indicates the diversity of the carbon isotope composition of the Arctic carbonates.  相似文献   

Distribution of some rare and trace elements in modern bottom sediments of the Caspian Sea     

A. V. Maslov  N. V. Kozina  A. A. Klyuvitkin  A. N. Novigatsky  A. S. Filippov  V. P. Shevchenko 《Oceanology》2016,56(4):552-563

The features of the distribution of some rare and trace elements in modern bottom sediments of the Caspian Sea have been studied from samples collected during cruises 35, 39, and 41 of the R/V Rift and the cruise of the R/V Nikifor Shurekov in 2013. It was established that bottom sediments in different areas of the Caspian Sea vary to some degree in the contents of Zr, Hf, Th, V, Cr, Co, Ni, Cu, Sr, and Ba in comparison to suspended matter discharged by the Volga River and rivers originating in the Caucasus. As follows from the results of a comparison of the geochemical features of modern bottom sediments of the Volga River delta and different sedimentary subsystems of the Caspian Sea with the chemical composition of Middle Archean granitoids and Paleozoic and Mesozoic–Cenozoic basalts, which are regarded as geochemical images of such provenance areas as the basement of East European Platform, Urals, and Caucasus, none of these regions is considered the dominant provenance area for all sedimentary subsystems of the Caspian Sea region. Here, the revealed similarity between modern bottom sediments of the northern, central and southern Caspian Sea regions, the Volga River delta, and Post-Archean average Australian shale (PAAS) in some parameters, including REE spectra, assumes that the Volga River discharge plays a dominant role in the formation of the geochemical image of Caspian Sea subsystems. The role of clastics, including the fine-grained fraction, which is supplied to the Caspian Sea from the Caucasus region and Elburz Mountains, is insignificant already in the coastal area, which is determined both by influence of the marginal filter (MF) and large-scale cholestatic current circulation.  相似文献