Hydrochemical features of the Kara Sea aquatic area in summer 2015     

P. N. Makkaveev  A. A. Polukhin  A. V. Kostyleva  E. A. Protsenko  S. V. Stepanova  Sh. Kh. Yakubov 《Oceanology》2017,57(1):48-57

During cruise 65 of the R/V Akademik Mstislav Keldysh in the Kara Sea, three transects were executed: one eastwards from the Novaya Zemlya Archipelago and two in the St. Anna and Voronin troughs. It was noted that the continental runoff affected the entire surveyed aquatic area, even at the northern extremity of the Novaya Zemlya Archipelago. The transect along the St. Anna Trough showed the presence of a slope frontal zone overlaid at the surface by a desalinated layer. The Voronin Trough was characterized by sliding of slope waters. The hydrochemical parameters show that the surveys were carried out during a recession of biological activity of the waters and that the peak bloom was over by that time. The hydrochemical structure of waters conformed to early autumn conditions, but before the beginning of intense cooling of surface waters.  相似文献   

Hydrochemical structure of the waters in the eastern part of the Laptev Sea in autumn 2015     

S. V. Stepanova  A. A. Polukhin  A. V. Kostyleva 《Oceanology》2017,57(1):58-64

The study of the Laptev Sea was a part of a comprehensive program for investigating Arctic seas during the cruise 63 of the R/V Akademik Mstislav Keldysh. On a transect along 130° E (September 8–14, 2015) from the estuary area of the Lena River on the traverse of the city of Tiksi to the continental slope (over 700 km), water samples were taken to study the hydrochemical structure of waters and the influence of the Lena River flow. From the obtained data, it was found that the effect of fresh water on the sea surface layer was very high and can be traced to a great distance from the river delta. An unconservative distribution of some hydrochemical parameters in the mixing zone was recorded. The concentration of nutrients in the surface layer, and a high turbidity can serve as limiting factors in the development of the phytoplankton community.  相似文献   

Fold–Thrust Deformations of New Siberia Island (Novosibirsky Islands,Russia): Age,Morphology, and Genesis of Structures     

Golionko  B. G.  Basilyan  A. E.  Nikolsky  P. A.  Kostyleva  V. V.  Malyshev  N. A.  Verzhbitsky  V. E.  Obmetko  V. V.  Borodulin  A. A. 《Geotectonics》2019,53(6):675-699

Geotectonics - Detailed lithological, stratigraphic, and structural studies of the fold-thrust structures were conducted on New Siberia Island. We have established that the jointly deformed...  相似文献   

Structure of the precambrian sedimentary cover and upper part of the basement in the Central Russian Aulacogen and Orsha Depression (East European Platform)     

N. P. Chamov  V. V. Kostyleva  A. F. Veis 《Lithology and Mineral Resources》2010,45(1):56-88

The Precambrian sedimentary section and upper part of the basement of the Central Russian Aulacogen and Orsha Depression, two largest structures located beneath the Moscow Syneclise are analyzed. It has been established that the Late Riphean Central Russian Aulacogen was initiated on the Proterozoic crust of the Transcratonic belt that separates different-aged geological blocks of the East European Platform basement. The Orsha Depression is superposed both on sedimentary complexes of the aulacogen and rocks constituting structures surrounding the Transcratonic belt. Boundaries of the sedimentary cover and basement are outlined and a new structure (Toropets-Ostashkov Trough) is defined. The Precambrian section recovered by Borehole North Molokovo is proposed to serve as a reference one for the Central Russian Aulacogen. The CMP records demonstrate seismocomplexes, which allow one to trace rock members and sequences defined by drilling. Eight seismocomplexes, combination of which varies in different structures, are defined in the Upper Riphean-Vendian part of the sedimentary section. The section of the Central Russian Aulacogen includes the following sedimentary complexes: dominant gray-colored arkoses (R₃¹), variegated arkoses (R₃²), red-colored arkoses (R₃³), and volcanosedimentary rocks (V₁²). The section of the Orsha Depression consists of dominant red-colored quartz sandstones (R₃⁴), glacial and interglacial (V₁¹), and variegated volcanogenic-terrigenous sediments. The upper seismocomplex (V₂) is composed of terrigenous and terrigenous-carbonate rocks. It represents the basal unit of the Moscow Syneclise, which marks the plate stage in development of the East European Platform. The upper part of the basement corresponds to a seismocomplex (Pr₁) represented by dynamometamorphosed rocks that form a tectonic mélange. Analysis of the lateral and vertical distribution of the defined seismocomplexes made it possible to specify the structure of the Riphean-Vendian part of the sedimentary cover and to revise their formation history in some cases.  相似文献   

On determination of low oxygen concentrations with Winkler technique     

E. V. Yakushev  E. L. Vinogradova  A. V. Dubinin  A. V. Kostyleva  N. M. Men’shikova  S. V. Pakhomova 《Oceanology》2012,52(1):122-129

The accuracy and detection limit of the oxygen technique is an actual problem in studying the processes that occur in the redox zone. The formal accuracy of the Winkler technique is 1 μM (0.02 mL L⁻¹) and its detection limit is about 3.0 μM (0.06 mL L⁻¹). These values are significantly higher than the similar characteristics (in molar concentrations) for such parameters as the hydrogen sulphide, nitrates, manganese, and others. In this work, we describe some recommendations for increasing the accuracy of the Winkler technique. The results of the application of these recommendations for the suboxic zone of the Black Sea are presented. During the 100th cruise of the R/V Professor Shtokman, argon-filled balloons were attached to the upper valves of Niskin bottles during the sampling, which allowed protecting the samples from contamination with atmospheric oxygen. The titration was performed with an automatic Metrohm Titrino burette with potentiometric end point detection. That allowed us to significantly increase the accuracy and decrease the detection limit compared with the visual techniques. The oxidized forms of metals present in the sea water (Mn(IV), Mn(III); Fe(III)) were measured, which allowed us to correct the Winkler technique calculations for the oxidizers. The studies performed during the 100th cruise of the R/V Professor Shtokman confirmed the absence of a layer of the coexistence of oxygen and hydrogen sulphide.  相似文献   

Water Dynamics and Structure in the Estuary of the Partizanskaya River (Nakhodka Bay,Sea of Japan)     

Semkin  P. Yu.  Tishchenko  P. Ya.  Lobanov  V. B.  Sergeev  A. F.  Barabanshchikov  Yu. A.  Mikhailik  T. A.  Pavlova  G. Yu.  Kostyleva  A. V.  Shkirnikova  E. M.  Tishchenko  P. P.  Chizhova  T. L. 《Water Resources》2019,46(1):29-38

Water Resources - Field studies of the seasonal and daily dynamics of the mixing zone were carried out in the microtidal estuary of the Partizanskaya River. The position of the mixing zone was...  相似文献   

Evaluation of ecosystem status in the shelf-slope zone of the northeastern Black Sea based on the trophic index (TRIX)     

N. D. Romanova  V. K. Chasovnikov  E. G. Arashkevich  S. A. Mosharov  A. B. Nikishina  A. V. Kostyleva  N. E. Louppova 《Oceanology》2016,56(1):114-117

The water conditions and trophic status in the shelf-slope zone and bays of the northeastern Black Sea were evaluated on the basis of monitoring data from 2007–2014. It has been shown that the concentrations of nutrients and chlorophyll “a” in the studied area are at the level of the pristine period (of the late 1970s). The concentration of mineral nitrogen in the surface water layer varied from 0.19 to 5.64 μM. The concentration of phosphates differed from analytical zero to 0.56 μM. The concentration of chlorophyll “a” in different seasons ranged from 0.24 to 0.89 μg/L. The trophic index characterizes the status of the marine shelf ecosystem near Gelendzhik city as “excellent” even in the bays. Significant year-to-year differences in the index were not detected. The range between the values of the trophic index in the bays and open sea was low (3.7 and 3.2, respectively).  相似文献   

Structure and composition of the sedimentary cover in the Knipovich Rift valley and Molloy Deep (Norwegian-Greenland basin)     

N. P. Chamov  S. Yu. Sokolov  V. V. Kostyleva  V. N. Efimov  A. A. Peive  G. N. Aleksandrova  M. E. Bylinskaya  E. P. Radionova  S. I. Stupin 《Lithology and Mineral Resources》2010,45(6):532-554

The multidisciplinary approach is used to analyze the structure of the sedimentary cover in the northern Knipovich Rift valley, Molloy Fracture Zone and synonymous basin, Svyatogor and Hovgard rises, Gorynych Hills, Litvin and Pogrebitskii seamounts, and western slope of the Spitsbergen Archipelago studied in Cruise 24 of the R/V Akademik Nikolaj Strakhov. Materials of the bathymetric survey with multibeam echo sounder, as well as continuous seismic and vertical acoustic profiling, revealed two main (NNW- and NNE-trending) systems of fractures in the neotectonic structure of the region. It was established that a system of NNE-oriented fractures, linear zones of the dominant development of keyboard deformations included, is consistent with the strike of magnetic anomalies reconstructed for this region. Tectonic aspects of the Knipovich Rift and prospects of its further development are considered. Based on the wave field pattern of continuous seismic profiling (CSP) records, four seismocomplexes indicating contrasting sedimentation settings and intense tectonic processes at different formation stages of the northern Norwegian-Greenland Sea are conditionally defined in the sedimentary cover of the study region. It was established the Molloy Fracture Zone is responsible for a system of horizontal reflectors of acoustically transparent structureless light spots (“blankings”) in the upper well-stratified part of the sedimentary section, which are characteristic of areas with ascending pore fluids. The micropaleontological study (palynomorphs of higher plants, dinocysts, planktonic foraminifers, and diatoms) revealed the presence of Miocene assemblages in sediments. Benthic foraminifers include late Paleocene-middle Eocene assemblages. The composition of rock-forming components demonstrates a directed succession of mineral-terrigenous associations from the feldspar-quartz type to mesomictic quartz-graywacke type.  相似文献   

Hydrochemical Structural Patterns of the Lena River–Laptev Sea Mixing Zone in the Autumn Period     

Kostyleva  A. V.  Polukhin  A. A.  Stepanova  S. V. 《Oceanology》2020,60(6):735-741

Oceanology - This study was based on data obtained during the cruise 63 of the R/V Akademik Mstislav Keldysh in September 2015. We examine the features of the hydrochemical structure of the Lena...  相似文献   

Paleotectonic Setting of the Accumulation of Middle Jurassic Deposits in the Northeastern Flange of the Nagondzha Terraine (Ulakhan-Sis Ridge)     

Kostyleva  V. V.  Gertseva  M. V.  Lutikov  O. A.  Vatrushkina  E. V.  Tuchkova  M. I.  Sokolov  S. D. 《Doklady Earth Sciences》2022,507(2):1096-1100

Doklady Earth Sciences - The age of the Middle Jurassic deposits of the Ulakhan-Sis Range is corrected to the Bajocian–Middle Bathonian. Three terrigenous units are identified that formed at...  相似文献