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CHEMICAL ENGINEERING (200 journals)                     

Showing 1 - 200 of 200 Journals sorted alphabetically
AATCC Journal of Research     Full-text available via subscription   (Followers: 7)
ACS Sustainable Chemistry & Engineering     Hybrid Journal   (Followers: 6)
Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials     Hybrid Journal   (Followers: 6)
Acta Polymerica     Hybrid Journal   (Followers: 9)
Additives for Polymers     Full-text available via subscription   (Followers: 22)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 8)
Advanced Chemical Engineering Research     Open Access   (Followers: 37)
Advanced Powder Technology     Hybrid Journal   (Followers: 17)
Advances in Applied Ceramics     Hybrid Journal   (Followers: 5)
Advances in Chemical Engineering     Full-text available via subscription   (Followers: 28)
Advances in Chemical Engineering and Science     Open Access   (Followers: 64)
Advances in Polymer Technology     Hybrid Journal   (Followers: 14)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 7)
American Journal of Polymer Science & Engineering     Open Access  
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 11)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 12)
Anti-Corrosion Methods and Materials     Hybrid Journal   (Followers: 10)
Applied Petrochemical Research     Open Access   (Followers: 3)
Asia-Pacific Journal of Chemical Engineering     Hybrid Journal   (Followers: 8)
Biochemical Engineering Journal     Hybrid Journal   (Followers: 15)
Biofuel Research Journal     Open Access   (Followers: 4)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 10)
Brazilian Journal of Chemical Engineering     Open Access   (Followers: 4)
Bulletin of Chemical Reaction Engineering & Catalysis     Open Access   (Followers: 2)
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 2)
Carbohydrate Polymers     Hybrid Journal   (Followers: 8)
Catalysts     Open Access   (Followers: 9)
ChemBioEng Reviews     Full-text available via subscription   (Followers: 1)
ChemEngineering     Open Access  
Chemical and Engineering News     Free   (Followers: 17)
Chemical and Materials Engineering     Open Access   (Followers: 16)
Chemical and Petroleum Engineering     Hybrid Journal   (Followers: 13)
Chemical and Process Engineering     Open Access   (Followers: 31)
Chemical and Process Engineering Research     Open Access   (Followers: 28)
Chemical Engineering & Technology     Hybrid Journal   (Followers: 31)
Chemical Engineering and Processing: Process Intensification     Hybrid Journal   (Followers: 16)
Chemical Engineering and Science     Open Access   (Followers: 24)
Chemical Engineering Communications     Hybrid Journal   (Followers: 14)
Chemical Engineering Education     Full-text available via subscription   (Followers: 1)
Chemical Engineering Journal     Hybrid Journal   (Followers: 50)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 25)
Chemical Engineering Research Bulletin     Open Access   (Followers: 16)
Chemical Engineering Science     Hybrid Journal   (Followers: 28)
Chemical Geology     Hybrid Journal   (Followers: 23)
Chemical Papers     Hybrid Journal   (Followers: 2)
Chemical Product and Process Modeling     Hybrid Journal   (Followers: 4)
Chemical Reviews     Full-text available via subscription   (Followers: 194)
Chemical Society Reviews     Full-text available via subscription   (Followers: 43)
Chemical Technology     Open Access   (Followers: 20)
ChemInform     Hybrid Journal   (Followers: 8)
Chemistry & Industry     Hybrid Journal   (Followers: 5)
Chemistry Central Journal     Open Access   (Followers: 4)
Chemistry of Materials     Full-text available via subscription   (Followers: 250)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 14)
ChemSusChem     Hybrid Journal   (Followers: 7)
Chinese Chemical Letters     Full-text available via subscription   (Followers: 2)
Chinese Journal of Chemical Engineering     Full-text available via subscription   (Followers: 4)
Chinese Journal of Chemical Physics     Hybrid Journal   (Followers: 1)
Coke and Chemistry     Hybrid Journal   (Followers: 1)
Coloration Technology     Hybrid Journal   (Followers: 1)
Computational Biology and Chemistry     Hybrid Journal   (Followers: 11)
Computer Aided Chemical Engineering     Full-text available via subscription   (Followers: 1)
Computers & Chemical Engineering     Hybrid Journal   (Followers: 10)
CORROSION     Full-text available via subscription   (Followers: 21)
Corrosion Engineering, Science and Technology     Hybrid Journal   (Followers: 37)
Corrosion Reviews     Hybrid Journal   (Followers: 6)
Crystal Research and Technology     Hybrid Journal   (Followers: 6)
Current Applied Polymer Science     Hybrid Journal   (Followers: 1)
Current Environmental Engineering     Hybrid Journal  
Current Opinion in Chemical Engineering     Open Access   (Followers: 7)
Designed Monomers and Polymers     Open Access   (Followers: 2)
Education for Chemical Engineers     Hybrid Journal   (Followers: 5)
Eksergi     Open Access  
European Polymer Journal     Hybrid Journal   (Followers: 42)
Fibers and Polymers     Full-text available via subscription   (Followers: 6)
Fluorescent Materials     Open Access   (Followers: 1)
Focusing on Modern Food Industry     Open Access   (Followers: 2)
Food and Environment Safety     Open Access  
Frontiers of Chemical Science and Engineering     Hybrid Journal   (Followers: 3)
Gels     Open Access  
Geochemistry International     Hybrid Journal   (Followers: 2)
Handbook of Powder Technology     Full-text available via subscription   (Followers: 6)
Heat Exchangers     Open Access   (Followers: 3)
High Performance Polymers     Hybrid Journal   (Followers: 1)
Hungarian Journal of Industry and Chemistry     Open Access  
Indian Chemical Engineer     Hybrid Journal   (Followers: 5)
Indian Journal of Chemical Technology (IJCT)     Open Access   (Followers: 10)
Indonesian Journal of Chemical Science     Open Access   (Followers: 1)
Industrial & Engineering Chemistry     Full-text available via subscription   (Followers: 12)
Industrial & Engineering Chemistry Research     Full-text available via subscription   (Followers: 22)
Industrial Chemistry Library     Full-text available via subscription   (Followers: 3)
Industrial Gases     Open Access  
Info Chimie Magazine     Full-text available via subscription   (Followers: 3)
International Journal of Chemical Engineering     Open Access   (Followers: 7)
International Journal of Chemical Reactor Engineering     Hybrid Journal   (Followers: 3)
International Journal of Chemical Technology     Open Access   (Followers: 5)
International Journal of Chemoinformatics and Chemical Engineering     Full-text available via subscription   (Followers: 2)
International Journal of Food Science     Open Access   (Followers: 3)
International Journal of Industrial Chemistry     Open Access   (Followers: 1)
International Journal of Polymeric Materials     Hybrid Journal   (Followers: 6)
International Journal of Waste Resources     Open Access   (Followers: 4)
Iranian Journal of Polymer Science and Technology     Open Access   (Followers: 1)
Journal of Chemical Engineering & Process Technology     Open Access   (Followers: 5)
Journal of Applied Crystallography     Hybrid Journal   (Followers: 7)
Journal of Applied Electrochemistry     Hybrid Journal   (Followers: 14)
Journal of Applied Polymer Science     Hybrid Journal   (Followers: 144)
Journal of Applied Science & Process Engineering     Open Access  
Journal of Biomaterials Science, Polymer Edition     Hybrid Journal   (Followers: 9)
Journal of Bioprocess Engineering and Biorefinery     Full-text available via subscription  
Journal of Chemical & Engineering Data     Full-text available via subscription   (Followers: 12)
Journal of Chemical and Biological Interfaces     Full-text available via subscription   (Followers: 1)
Journal of Chemical Ecology     Hybrid Journal   (Followers: 7)
Journal of Chemical Engineering     Open Access   (Followers: 24)
Journal of Chemical Engineering and Materials Science     Open Access   (Followers: 4)
Journal of Chemical Science and Technology     Open Access   (Followers: 6)
Journal of Chemical Sciences     Partially Free   (Followers: 23)
Journal of Chemical Technology & Biotechnology     Hybrid Journal   (Followers: 10)
Journal of Chemical Theory and Computation     Full-text available via subscription   (Followers: 18)
Journal of CO2 Utilization     Hybrid Journal   (Followers: 2)
Journal of Combinatorial Chemistry     Full-text available via subscription   (Followers: 1)
Journal of Crystallization Process and Technology     Open Access   (Followers: 8)
Journal of Environmental Chemical Engineering     Hybrid Journal   (Followers: 7)
Journal of Food Measurement and Characterization     Hybrid Journal  
Journal of Food Processing & Technology     Open Access   (Followers: 1)
Journal of Fuel Chemistry and Technology     Full-text available via subscription   (Followers: 5)
Journal of Geochemical Exploration     Hybrid Journal   (Followers: 1)
Journal of Industrial and Engineering Chemistry     Hybrid Journal   (Followers: 1)
Journal of Information Display     Hybrid Journal   (Followers: 1)
Journal of Inorganic and Organometallic Polymers and Materials     Partially Free   (Followers: 9)
Journal of Materials Science and Chemical Engineering     Open Access   (Followers: 1)
Journal of Molecular Catalysis A: Chemical     Hybrid Journal   (Followers: 7)
Journal of Non-Crystalline Solids     Hybrid Journal   (Followers: 8)
Journal of Organic Semiconductors     Open Access   (Followers: 5)
Journal of Physics and Chemistry of Solids     Hybrid Journal   (Followers: 5)
Journal of Polymer and Biopolymer Physics Chemistry     Open Access   (Followers: 7)
Journal of Polymer Engineering     Hybrid Journal   (Followers: 11)
Journal of Polymer Research     Hybrid Journal   (Followers: 7)
Journal of Polymer Science Part C : Polymer Letters     Hybrid Journal   (Followers: 7)
Journal of Polymers     Open Access   (Followers: 6)
Journal of Polymers and the Environment     Hybrid Journal   (Followers: 1)
Journal of Pure and Applied Chemistry Research     Open Access   (Followers: 2)
Journal of the American Chemical Society     Full-text available via subscription   (Followers: 333)
Journal of the Bangladesh Chemical Society     Open Access  
Journal of the Brazilian Chemical Society     Open Access   (Followers: 2)
Journal of The Institution of Engineers (India) : Series E     Hybrid Journal   (Followers: 2)
Journal of the Taiwan Institute of Chemical Engineers     Hybrid Journal   (Followers: 2)
Journal of Water Chemistry and Technology     Hybrid Journal   (Followers: 9)
Jurnal Bahan Alam Terbarukan     Open Access  
Jurnal Inovasi Pendidikan Kimia     Open Access   (Followers: 5)
Jurnal Reaktor     Open Access  
Jurnal Rekayasa Kimia & Lingkungan     Open Access  
Jurnal Teknologi Dan Industri Pangan     Open Access   (Followers: 1)
Konversi     Open Access  
Korean Journal of Chemical Engineering     Hybrid Journal   (Followers: 3)
Main Group Metal Chemistry     Hybrid Journal   (Followers: 2)
Materials Chemistry and Physics     Full-text available via subscription   (Followers: 17)
Materials Science and Applied Chemistry     Open Access  
Materials Sciences and Applied Chemistry     Full-text available via subscription  
Modern Chemistry & Applications     Open Access  
Molecular Imprinting     Open Access  
MRS Communications     Hybrid Journal  
Nanochemistry Research     Open Access  
Nanocontainers     Open Access   (Followers: 1)
Nanofabrication     Open Access  
Noise Control Engineering Journal     Full-text available via subscription   (Followers: 4)
Ochrona Srodowiska i Zasobów Naturalnych : Environmental Protection and Natural Resources     Open Access  
Petroleum Chemistry     Hybrid Journal   (Followers: 1)
Physics and Chemistry of Glasses - European Journal of Glass Science and Technology Part B     Full-text available via subscription   (Followers: 4)
Plasma     Open Access   (Followers: 1)
Plasma Processes and Polymers     Hybrid Journal   (Followers: 3)
Plasmas and Polymers     Hybrid Journal  
Polymer     Hybrid Journal   (Followers: 135)
Polymer Bulletin     Hybrid Journal   (Followers: 8)
Polymer Composites     Hybrid Journal   (Followers: 17)
Polyolefins Journal     Open Access  
Powder Metallurgy Progress     Unknown   (Followers: 1)
Powder Technology     Hybrid Journal   (Followers: 13)
Recent Innovations in Chemical Engineering     Hybrid Journal  
Recyclable Catalysis     Open Access   (Followers: 1)
Research on Chemical Intermediates     Hybrid Journal  
Reviews in Chemical Engineering     Hybrid Journal   (Followers: 5)
Revista ION     Open Access  
Revista Mexicana de Ingeniería Química     Open Access  
Rubber Chemistry and Technology     Full-text available via subscription   (Followers: 2)
Russian Chemical Bulletin     Hybrid Journal   (Followers: 2)
Russian Journal of Applied Chemistry     Hybrid Journal   (Followers: 1)
Science and Engineering of Composite Materials     Hybrid Journal   (Followers: 61)
Solid Fuel Chemistry     Hybrid Journal  
South African Journal of Chemical Engineering     Open Access   (Followers: 2)
South African Journal of Chemistry     Open Access   (Followers: 2)
Surface Engineering and Applied Electrochemistry     Hybrid Journal   (Followers: 6)
Sustainable Chemical Processes     Open Access   (Followers: 2)
Synthesis Lectures on Chemical Engineering and Biochemical Engineering     Full-text available via subscription  
The Canadian Journal of Chemical Engineering     Hybrid Journal   (Followers: 4)
The Chemical Record     Hybrid Journal   (Followers: 1)
Theoretical Foundations of Chemical Engineering     Hybrid Journal   (Followers: 3)
Transition Metal Chemistry     Hybrid Journal   (Followers: 4)
Transylvanian Review of Systematical and Ecological Research     Open Access  
Visegrad Journal on Bioeconomy and Sustainable Development     Open Access   (Followers: 2)
Zeitschrift für Naturforschung B : A Journal of Chemical Sciences     Open Access   (Followers: 1)


Journal Cover Geochemistry International
  [SJR: 0.399]   [H-I: 18]   [2 followers]  Follow
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1556-1968 - ISSN (Online) 0016-7029
   Published by Springer-Verlag Homepage  [2351 journals]
  • Age of Plutonic Rocks from the Vema Fracture Zone (Central Atlantic) and
           Nature of Their Mantle Sources
    • Authors: Yu. A. Kostitsyn; S. A. Silantyev; M. O. Anosova; V. V. Shabykova; S. G. Skolotnev
      Pages: 89 - 110
      Abstract: This study presents the results of petrographic, geochemical, and isotope geochronological analyses of rock samples from the Southern flank of the Vema transform fault (Atlantic), which were dredged on cruises 19-th and 22-nd of the R/V Akademik Nikolai Strakhov. The sample suite includes both fresh and metamorphosed gabbros, dolerites, serpentinites, metapyroxenites. Zircons separated from three gabbro samples recovered at three different stations were used for in situ U–Pb dating by LA-ICP-MS. The ages reveal a strong linear relationship with a distance from the axis of the Mid-Atlantic ridge, which allowed us to estimate the rate of spreading in this segment of the Mid-Atlantic Ridge. It can be concluded that the estimated spreading rate of 16.2 ± 0.8 mm/yr was constant over the past 15 Myr. The mutual consistency of all U-Pb zircon and 39Ar–40Ar amphibole ages (Cipriani et al., 2009) obtained from the sampled transect suggests the temporal continuity of magmatic events that led to the formation of the original gabbroic rocks and their transformation during subsequent metamorphism. Rb—Sr isotope data show that hydrothermal activity took place in the presence of seawater between 14.7 and 9 Ma in the spreading axis region. Variations in the Nd isotopic composition in the time sequence of magmatic events indicate a high degree of chemical and isotopic heterogeneity of the ascending mantle material which became later entrained in the melting region beneath a spreading zone. Melting of the sources with primitive mantle composition (εNd ~ + 8 to +9) as well as enriched sources took place in the time interval between ~ 17 and 14.7 Ma and at about 8 Ma. The enriched source material is most likely represented by ancient mafic substratum.
      PubDate: 2018-02-01
      DOI: 10.1134/s0016702918020039
      Issue No: Vol. 56, No. 2 (2018)
  • Early Stage in the Evolution of the Paleoasian Ccean at the Western Margin
           of the Siberian Craton: Geochemical and Geochronological Evidence
    • Authors: I. I. Likhanov; S. V. Zinoviev
      Pages: 111 - 124
      Abstract: The discovery of glaucophane relicts in the high-pressure tectonites of the Yenisei suture zone of the Yenisei Ridge suggests the manifestation of the “Chilean-type” convergent margin on the western Siberian Craton, which was controlled by subduction of oceanic crust beneath the continental margin. These rocks are restricted to the tectonic suture between the craton and the Isakovka ocean-island terrane and experienced two metamorphic stages. Petrogeochemical characteristics of the mafic tectonites indicate that their protoliths are N-MORB and E-MORB basalts. More primitive N-MORB basalts were formed at the initial spreading stages through melting of the upper depleted mantle. Higher Ti basalts were formed by melting of enriched mantle protolith at the later spreading stages. U–Pb zircon age of 701.6 ± 8.4 Ma of the metamorphosed analogues of normal basalts marks the initiation of oceanic crust in the region. Revealed sequence of spreading, subduction (640–620 Ma), and shear deformations (~600 Ma) records the early stages in the evolution of the Paleoasian ocean in its junction zone with the western margin of the Siberian craton: from formation of fragments of oceanic crust to the completion of accretionary–subduction events.
      PubDate: 2018-02-01
      DOI: 10.1134/s0016702918020040
      Issue No: Vol. 56, No. 2 (2018)
  • SPINMELT-2.0: Simulation of Spinel–Melt Equilibrium in Basaltic Systems
           under Pressures up to 15 Kbar: II. Description of the Program Package, the
           Topology of the Cr-spinel–Melt Model System, and Petrological
    • Authors: G. S. Nikolaev; A. A. Ariskin; G. S. Barmina
      Pages: 125 - 135
      Abstract: The paper represents an algorithmic implementation of the SPINMELT-2.0 model designed to simulate Cr-spinel–melt equilibrium, and provides a description of its petrologic options. The properties of the SPINMELT-2.0 model were studied by modeling the topology of the liquidus surface of spinel and its dependence on pressure, redox potential, and concentrations of major components (including Cr2O3 and H2O) in the melt. Reference simulations were carried out for primitive MORB tholeiite. The spinel composition is demonstrated to depend on variously (and often oppositely) acting factors. Providing an accurate estimate of a parental magma composition, the SPINMELT-2.0 program allows one to evaluate a range of P–T–fO2–H2 O parameters responsible for the composition of an original magmatic spinel. The SPINMELT program makes it possible not only to effectively correlate available independent petrological estimates but also to consciously correct them, which is particularly important when the composition of the model melts should be estimated. This is illustrated by the application of the model to data on the composition of rocks and minerals of two young volcanoes in Kamchatka: Tolbachik and Gorely.
      PubDate: 2018-02-01
      DOI: 10.1134/s0016702918020052
      Issue No: Vol. 56, No. 2 (2018)
  • Silica Distribution in the System Quartz–Water–Vapor Depending on the
           Temperature Gradient
    • Authors: V. A. Alekseyev; L. S. Medvedeva
      Pages: 136 - 147
      Abstract: Careful measurements of temperature on the surface of autoclaves indicate that small temperature gradients (TG) occur in the standard electric furnaces. These gradients can affect the results of long-lasting (up to 775 days) experiments in the system quartz–water–vapor at 300°C. From the bottom of the autoclave to its top, the temperature decreased in the upper parts of the electric furnaces and increased in their lower parts (TG =–0.08 and 0.15°C/cm, respectively). In the upper parts of the electric furnaces, the concentration of dissolved silica (m) was close to the quartz solubility (10 mmol/kg), and no other changes took place, which is consistent with the currently conventionally admitted notion that quartz is stable under these conditions. In the lower parts of the electric furnaces, m decreased to 0.03 mmol/kg, and opal was precipitated on the walls of the capsules above the solution (the opal was transformed into secondary quartz with time). These data suggest that no equilibrium silica distribution between liquid and vapor water phases was reached. We have suggested and analyzed as wide as possible circle of hypotheses conceivably able to explain this unequilibrated state. The most realistic explanation of the phenomenon seems to be that distillation is initiated by preferable evaporation of the solution in its thin (<100 nm) layer at the meniscus edge. A mathematic model of the process is suggested. The model is consistent with experimental data. The phenomenon in question can be detected in various experimental and technological systems and hampers the attainment of complete equilibrium. In natural systems, this phenomenon can lead to the migration of cavities partly filled with solution at an inversion of the geothermal gradient (beneath sills and lava flows).
      PubDate: 2018-02-01
      DOI: 10.1134/s0016702918020027
      Issue No: Vol. 56, No. 2 (2018)
  • Interaction of Titanium Minerals and Their Melts with Diamond-Forming
           Media (Experiments at 7–8 GPa)
    • Authors: Yu. A. Litvin; A. V. Bovkun; V. K. Garanin
      Pages: 148 - 161
      Abstract: Melting relations in the multicomponent diamond-forming systems of the upper mantle with a boundary of K–Na–Mg–Fe–Ca carbonate, phases of the model peridotite and eclogite, carbon, and titanium minerals from kimberlite (ilmenite FeTiO3, perovskite CaTiO3, and rutile TiO2) were studied experimentally at 7–8 GPa and 1600–1650°C. Perovskite reacts with the formation of rutile in the diamond-forming silicate–carbonate melts. We discovered liquid immiscibility between melts of titanium minerals, on the one hand, and carbonate–carbon, peridotite–carbonate–carbon, and eclogite–carbonate–carbon diamond-forming melts, on the other. The solubility of titanium mineral in diamond-forming melts is negligible independent of their concentration in the experimental systems. Growth melts retain high diamond-forming efficiency. In general, the experimental results are evident for the xenogenic nature of titanium minerals in inclusions in diamond and, therefore, in diamond-forming melts. It is shown that the physicochemical factors that may correlate the diamond content with the concentration of Ti in kimberlite do not occur during the diamond genesis in silicate–carbonate–carbon parental melts containing titanium minerals and their melts.
      PubDate: 2018-02-01
      DOI: 10.1134/s0016702918010032
      Issue No: Vol. 56, No. 2 (2018)
  • Characteristics of Sources of Oils of Romashkino Field by Composition of
           Saturated and Aromatic Biomarkers
    • Authors: M. B. Smirnov; E. N. Poludetkina
      Pages: 162 - 170
      Abstract: Composition of saturated biomarkers revealed the presence of at least two sources of oils of the Romashkino field with the monotypic conditions. All the studied oils are characterized by presence of a large number of components—anoxia testifiers in the photic layer of sedimentation basin in the fractions of aromatic compounds. These are products full or partial hydrogenation, cyclization and degradation of polyene compounds. Total content of this group of compounds is measured in these fractions for the first time. It is shown that the total content of the anoxia testifiers is high. Thus the specific characteristic of oil source rocks is defined—their formation in the conditions of existence of anoxia in the photic layer during the entire accumulation time of initial organic matter, and the thickness of the layer infected with hydrogen sulphide was significant. On the basis of composition and content of the anoxia testifiers it is shown that the hydrogenation of initial polyenes prevailed in diagenesis over the processes of cyclization.
      PubDate: 2018-02-01
      DOI: 10.1134/s0016702918010068
      Issue No: Vol. 56, No. 2 (2018)
  • Diagenesis of Organic Matter in the Top Layer of the Sediments of the
           Peter the Great Bay in Hypoxia Locations
    • Authors: P. Ya. Tishchenko; Yu. A. Barabanshchikov; T. I. Volkova; A. A. Marjash; T. A. Mikhailik; G. Yu. Pavlova; S. G. Sagalaev; P. P. Tishchenko; N. D. Khodorenko; E. M. Shkirnikova; M. G. Shvetsova
      Pages: 171 - 181
      Abstract: During Cruise 62nd of the R/V “Professor Gagarinsky” in September, 2014, the carbonate system of sediments and contents of nutrients and organic carbon in pore water were studied in two geochemical stations located in hypoxia areas in the Peter the Great Bay. It was established that the concentrations of silica, phosphorus, and ammonium increase by 5, 10, and 20 times, respectively, with sediment depth to 70–80 cm. The alkalinity, dissolved inorganic carbon, and the partial pressure of carbon dioxide significantly increase with depth, while рН value and organic matter (ОM) decrease. Changes in the chemical composition of pore water with sediment depth (0–80 cm) are caused by anaerobic microbial degradation of OM, concentration of which in the top sediment layer is 2–3%. The degradation products of OM in the bottom waters of bay and pore waters of bottom sediments indicate that its main sources are diatoms. During hypoxia, the oxygen demand rate by sediment surface near Furugelm Island is estimated to be 5 mmol/(m2 day). A combination of such factors as downwelling circulation, the absence of photosynthetically active radiation, and the high oxygen demand rate at the water/sediment interface provides hypoxia formation in the depressions of the Peter the Great Bay bottom topography.
      PubDate: 2018-02-01
      DOI: 10.1134/s0016702918010093
      Issue No: Vol. 56, No. 2 (2018)
  • Chemical Fractionation of Aluminium in the Sediments of El-Burullus Lagoon
           of Nile Delta, Egypt
    • Authors: Samir M. Nasr; Mohamed A. Okbah; Wafaa I. El-Anany; Naglaa F. Soliman
      Pages: 182 - 188
      Abstract: A five step sequential extraction technique, following Tessier’s protocol has been applied to determine the chemical association of aluminium with major sedimentary phases (exchangeable, carbonate, manganese and iron oxides, organic and residual fraction) in four short sediment cores collected from El-Burullus lagoon of the Nile delta, Egypt. This study is a first approach of chemical fractionation of aluminium in one of the protective areas of the Mediterranean Sea of Egypt. The total metal content was also determined. The results of the fractionation study indicated that aluminium was mainly associated with the residual fraction (>95%). The organic and Fe–Mn oxide fractions were the next important phases. The exchangeable and carbonate fractions were less than 1%, limiting its potential toxicity as a pollutant. The geochemical analysis of aluminium forms reflected the lithogenic origin of this metal in the study area.
      PubDate: 2018-02-01
      DOI: 10.1134/s0016702918020064
      Issue No: Vol. 56, No. 2 (2018)
  • Rare-Earth Elements in the Atmospheric Precipitation of the City of
    • Authors: V. I. Radomskaya; D. V. Yusupov; L. M. Pavlova
      Pages: 189 - 198
      Abstract: The mineral composition, distribution and fractionation of rare-earth elements in dissolved and suspended forms (solid residue) of atmospheric precipitation were studied by analyzing the snow sampled over urbanized territory by the example of the city of Blagoveschensk. Electron-microscopic studies revealed the own minerals of rare-earth elements in dust aerosols. It is shown that the main sources of the atmospheric pollution by rare-earth elements were emissions of TPP (heat and power plants) and boiler houses. Contrasting geochemical anomalies of rare-earth elements were found in the snow cover of the city. The REE concentrations in the solid phase of snow are few orders of magnitude higher than those of the liquid phase. The snow solid phase provides insight into the REE behavior, because it directly reflects the impact of different anthropogenic sources. The characteristic feature of the REE distribution in the solid residue of snow is their LREE enrichment relative to MREE and HREE. The average HREE content is 10% of total REE. In the snow water–solid phase system, most samples show weak fractionation between LREE and HREE owing to the low total mineralization of the snow liquid phase and the small content of organic matter.
      PubDate: 2018-02-01
      DOI: 10.1134/s0016702918010056
      Issue No: Vol. 56, No. 2 (2018)
  • Mineralogy of silicate inclusions in the Elga IIE iron meteorite
    • Authors: S. N. Teplyakova; C. A. Lorenz; M. A. Ivanova; N. N. Kononkova; M. O. Anosova; K. M. Ryazantsev; Yu. A. Kostitsyn
      Pages: 1 - 23
      Abstract: The petrography, mineral modal data and major and trace element compositions of 15 silicate inclusions in the Elga iron meteorite (chemical group IIE) show that these inclusions represent chemically homogeneous zoned objects with highly variable structures, reflecting the sequence of crystallization of a silicate melt during cooling of the metal host. The outer zones of inclusions at the interface with their metal host have a relatively medium-grained hypocrystalline texture formed mainly by Cr-diopside and merrillite crystals embedded in high-silica glass, whereas the central zones have a fine-grained hypocrystalline texture. Merrillite appears first on the liquidus in the outer zones of the silicate inclusions. Na and REE concentrations in merrillite from the outer zones of inclusions suggest that it may have crystallized as α-merrillite in the temperature range of 1300–1700°С. Merrillite tends to preferentially accumulate Eu without Sr. Therefore, strongly fractionated REE patterns are not associated with prolonged differentiation of the silicate melt source but depend on crystallization conditions of Н-chondrite droplets in a metallic matrix. The systematic decrease in Mg# with increasing Fe/Mn in bronzite may indicate partial reduction of iron during crystallization of the inclusion melt. The modal and bulk compositions of silicate inclusions in the Elga meteorite, as well as the chemical composition of phases are consistent with the model equilibrium crystallization of a melt, corresponding to 25% partial melting of H-chondrite, and the crystallizing liquidus phase, merrillite, and subsequent quenching at about 1090°С. Despite a high alkali content of the average weighted bulk inclusion composition, La/Hf and Rb/Th fall within the field of H chondrites, suggesting their common source. Our results reveal that silicate inclusions in the Elga (IIE) iron meteorite originated by mixing of two impact melts, ordinary chondrite and Ni-rich iron with а IIE composition, which were produced by impact event under near-surface conditions on a partially differentiated parent asteroid.
      PubDate: 2018-01-01
      DOI: 10.1134/s0016702918010081
      Issue No: Vol. 56, No. 1 (2018)
  • SPINMELT-2.0: Simulation of spinel–melt equilibrium in basaltic systems
           under pressures up to 15 kbar: I. model formulation, calibration, and
    • Authors: G. S. Nikolaev; A. A. Ariskin; G. S. Barmina
      Pages: 24 - 45
      Abstract: The paper presents results of testing currently used models proposed to describe Cr-spinel–melt equilibrium: models of the MELTS family by M.S. Ghiorso with colleagues, the SPINMELT program by A.A. Ariskin and G.S. Nikolaev, and the “MELT–CHROMITE spinel calculator” by А.А. Pustovetov and R.L. Roeder. The new calibration of the SPINMELT model presented in this publication enables calculating a sixcomponent (Mg, Fe2+, Cr, Al, Fe3+, and Ti) composition of Cr-spinel and the \(T - {f_{{o_2}}}\) parameters of its stability on the liquidus of basaltic melts under pressures up to 15 kbar. The model is based on results of 392 runs from 43 experimental studies, including systems of normal alkalinity at \({f_{{o_2}}}\) ≤ QFM + 2. The experimental dataset (which was extended compared to that used for the previous calibration) allowed us not only to estimate the pressure effect, but also apply the model to aluminous and hydrous systems. Tests of the SPINMELT-2.0 model show that the errors of the calculated temperature of the spinel–melt equilibrium increase with pressure from 16°C at 1 atm to 50°C at 15 kbar. Experimental spinel compositions are reproduced by the model accurate to < 3 at % Al and Cr, and no worse 1 at % for the other cations.
      PubDate: 2018-01-01
      DOI: 10.1134/s0016702918010044
      Issue No: Vol. 56, No. 1 (2018)
  • Isotopic systematics of He, Ar, S, Cu, Ni, Re, Os, Pb, U, Sm, Nd, Rb, Sr,
           Lu, and Hf in the rocks and ores of the Norilsk deposits
    • Authors: E. M. Prasolov; S. A. Sergeev; B. V. Belyatsky; E. S. Bogomolov; K. A. Gruzdov; I. N. Kapitonov; R. Sh. Krymsky; V. O. Khalenev
      Pages: 46 - 64
      Abstract: This paper reports the first results of a study of 11 isotope systems (3He/4He, 40Ar/36Ar, 34S/32S, 65Cu/63Cu, 62Ni/60Ni, 87Sr/86Sr, 143Nd/144Nd, 206–208Pb/204Pb, Hf–Nd, U–Pb, and Re–Os) in the rocks and ores of the Cu–Ni–PGE deposits of the Norilsk ore district. Almost all the results were obtained at the Center of Isotopic Research of the Karpinskii All-Russia Research Institute of Geology. The use of a number of independent genetic isotopic signatures and comprehensive isotopic knowledge provided a methodic basis for the interpretation of approximately 5000 isotopic analyses of various elements. The presence of materials from two sources, crust and mantle, was detected in the composition of the rocks and ores. The contribution of the crustal source is especially significant in the paleofluids (gas–liquid microinclusions) of the ore-forming medium. Crustal solutions were probably a transport medium during ore formation. Air argon is dominant in the ores, which indicates a connection between the paleofluids and the atmosphere. This suggests intense groundwater circulation during the crystallization of ore minerals. The age of the rocks and ores of the Norilsk deposits was determined. The stage of orebody formation is restricted to a narrow age interval of 250 ± 10 Ma. An isotopic criterion was proposed for the ore-bearing potential of mafic intrusions in the Norilsk–Taimyr region. It includes several interrelated isotopic ratios of various elements: He, Ar, S, and others.
      PubDate: 2018-01-01
      DOI: 10.1134/s0016702917110088
      Issue No: Vol. 56, No. 1 (2018)
  • Origin of the simplest genetic code as an evolutionary stage of the Earth
    • Authors: V. A. Dement’ev
      Pages: 65 - 70
      Abstract: The minimal set of conditions is found under which a primitive genetic code can be formed in the chemical world in which polypeptides and polynucleotides can be produced. Molecular modeling demonstrates that multiple cycles of synthesis and thermal destruction of biopolymers result in spontaneous complication of their structure. This evolutionary progressive complication of polypeptides and polynucleotides coding them results in certain specific functions of the polypeptides, which are similar to properties of enzymes. Computer simulations confirm the internal logical consistency of the simplified scenario suggested for the origin of a genetic code as a process of transferring information on the structure of biomolecules to the historical future, in spite of the continuous thermal decomposition of these structures.
      PubDate: 2018-01-01
      DOI: 10.1134/s0016702918010020
      Issue No: Vol. 56, No. 1 (2018)
  • Volatility inversion of silicon and magnesium oxides during the
           evaporation of HASP glasses on the moon
    • Authors: O. I. Yakovlev; K. M. Ryazantsev; S. I. Shornikov
      Pages: 71 - 74
      Abstract: An inversion of SiO2 and MgO volatility occurs during high-temperature melt evaporation in the CaO–MgO–Al2O3–SiO2 (CMAS) system. This results in that SiO2, which is usually more volatile than MgO, becomes less volatile during the evaporation of melts enriched in the refractory oxides CaO and Al2O3. The volatility inversion is adequately explained within the theory of acid–base interaction of silicate melt components developed by D.S. Korzhinskii. The compositions of high-Al2O3 and SiO2-poor glasses (known as HASP glasses) from the lunar regolith show a systematic decrease in MgO/SiO2 with increasing CaO content, which is a direct consequence of the influence of acid–base effects.
      PubDate: 2018-01-01
      DOI: 10.1134/s001670291801010x
      Issue No: Vol. 56, No. 1 (2018)
  • Calorimetric determination of the standard enthalpy of formation of
           stannite, Cu 2 FeSnS 4
    • Authors: T. A. Stolyarova; A. V. Baranov; E. G. Osadchii
      Pages: 75 - 77
      Abstract: The standard enthalpy of formation of stannite (Cu2FeSnS4) was calculated from the calorimetric measurements of the reactions of its formation from simple synthetic sulfides: Cu2S + FeS2 + SnS → Cu2FeSnS4 and 2CuS + FeS + SnS → Cu2FeSnS4. Using published data for the binary sulfides, the standard enthalpy of formation of stannite from the elements was determined as ΔfH°298.15(Cu2FeSnS4) =–(417.28 ± 2.28) kJ mol–1.
      PubDate: 2018-01-01
      DOI: 10.1134/s001670291801007x
      Issue No: Vol. 56, No. 1 (2018)
  • Chronicle of the annual 2017 All-Russia Seminar on experimental
           mineralogy, petrology, and geochemistry
    • Authors: E. V. Zharkova
      Pages: 78 - 87
      PubDate: 2018-01-01
      DOI: 10.1134/s0016702917120059
      Issue No: Vol. 56, No. 1 (2018)
  • Heavy metal distribution in the surface layer of bottom sediments of the
           Kara Sea
    • Authors: V. Yu. Rusakov; T. G. Kuzmina; M. A. Levitan; E. S. Toropchenova; A. V. Zhilkina
      Pages: 1079 - 1089
      Abstract: This paper addresses the distribution of heavy metals (Co, Ni, Cu, Zn, Cd, Sn, Sb, Pb, and Bi) as well as Si, Al, Fe, and Mn in the surface (0–2 cm) layer of bottom sediments of the Kara Sea. The contents of these elements are determined in each of the previously distinguished facies-genetic types of terrigenous sediments: fluvial, glacial, estuarine, shallow water–marine, “background” marine, and relict sediments. It is shown that these types reflect the modern conditions of accumulation of river discharge material, which forms fans of two greatest Siberian rivers, Ob and Yenisei. The main stages are distinguished in heavy metal accumulation. The first stage is related to the avalanche sedimentation of terrigenous sediments in the estuary and characterized by the elevated contents of Co, Ni, Cu, Zn, Cd, Sb, and Bi. The second stage reflects the mechanical differentiation of sedimentary material by waves and bottom currents in a shallow-water sea part adjacent to the estuarine zone, with accumulation of Pb- and Sn-bearing “heavy” ore minerals. The deepwater background terrigenous–marine sediments accumulate mainly Ni, Zn, and Cd, as well as Mn. The relict sediments differ in the high contents of Si, Mn, and Sn.
      PubDate: 2017-12-01
      DOI: 10.1134/s0016702917090075
      Issue No: Vol. 55, No. 12 (2017)
  • Measurements and calculations of solid-liquid equilibria in the ternary
           systems NaBr–Na 2 SO 4 –H 2 O and KBr–K 2 SO 4 –H 2 O at 348 K
    • Authors: Shi-Hua Sang; Rui-Zhi Cui; Xue-Ping Zhang; Kai-Jie Zhang
      Pages: 1131 - 1139
      Abstract: According to the compositions of the underground brine resources in the west of Sichuan Basin, solubilities of the ternary systems NaBr–Na2SO4–H2O and KBr–K2SO4–H2O were investigated by isothermal method at 348 K. The equilibrium solid phases, solubilities of salts, and densities of the solutions were determined. On the basis of the experimental data, the phase diagrams and the density-composition diagrams were plotted. In the two ternary systems, the phase diagrams consist of two univariant curves, one invariant point and two crystallization fields. Neither solid solution nor double salts were found. The equilibrium solid phases in the ternary system NaBr–Na2SO4–H2O are NaBr and Na2SO4, and those in the ternary system KBr–K2SO4–H2O are KBr and K2SO4. Using the solubilities data of the two ternary subsystems at 348 K, mixing ion-interaction parameters of Pitzer’s equation θxxx, Ψxxx and Ψxxx were fitted by multiple linear regression method. Based on the chemical model of Pitzer’s electrolyte solution theory, the solubilities of phase equilibria in the two ternary systems NaBr–Na2SO4–H2O and KBr–K2SO4–H2O were calculated with corresponding parameters. The calculation diagrams were plotted. The results showed that the calculated values have a good agreement with experimental data.
      PubDate: 2017-12-01
      DOI: 10.1134/s0016702917120047
      Issue No: Vol. 55, No. 12 (2017)
  • Variability of organic carbon isotope and C/N in the Hemudu Area, Hangzhou
           Bay and its environmental implications in the Holocene
    • Authors: Rui Liu; Hongbo Zheng
      Pages: 1154 - 1163
      Abstract: With the purpose of tracing the variations of the organic matter sources of sediments, a sample column (25.96 m in size) from the Hemudu Area of Hangzhou Bay was put through AMS14C dating and biogeochemical analysis. TOC and TN presented similar variation trends, suggesting the same and stable sources of organic matter; the bad correlation between the grain size and TOC content indicated that the organic matter occurrence was neither controlled by the grain size nor the surface absorption of the fine particles, but it may has something to do with the complicated sedimentary hydrodynamic force, the input of organic matter and microbial action. Judging on the basis of C/N ratio and δ13CTOC, the organic carbon in sediments was a mixture of terrigenous and marine organic carbon, testifying to the land-sea interaction characteristic of the study area. The indexes experienced abrupt changes at about 6.5 ka BP, when the lighter terrigenous organic carbon made an increased proportion to the heavier marine organic carbon. The phenomenon reflected the enclosure of the lagoon and the reduced exchange interactions with the seawater of open seas.
      PubDate: 2017-12-01
      DOI: 10.1134/s001670291714004x
      Issue No: Vol. 55, No. 12 (2017)
  • Hydrogeochemical background based on spring waters (Lubuskie Lakeland,
           western Poland)
    • Authors: A. Szczucińska
      Pages: 1164 - 1170
      Abstract: Hydrogeochemical background determined for an investigated environment, defines characteristic range of its hydrochemical characteristics. This allows to observe the temporal changes of the chemical water properties taking place in the studied environments, such as due to human impact. The paper presents the results of study on the present-day hydrogeochemical background in the Lubuskie Lakeland, the region repeatedly covered by the ice sheets during the Pleistocene and little affected by anthropogenic impact. The hydrogeochemical background was established on a basis of physicochemical analyses of spring waters sampled every 3 months between November 2011 and October 2013 from 20 springs. Present-day hydrogeochemical background was assumed to be represented by values ranging between 16 and 84 percentiles. The ranges of hydrogeochemical background for the studied ions on the Lubuskie Lakeland, were in the lower range of the background considered for useful waters in Poland. The obtained results indicated that the studied spring waters were poorly diversified in terms of composition of main cations and anions, as well as electrical conductivity and total water hardness. However, large variability was observed for Fetot, Mn2+ and NO3 −. Moreover, NO3 − and SO4 2− were noted in some cases to be in excess of national hydrogeochemical background values.
      PubDate: 2017-12-01
      DOI: 10.1134/s0016702917140051
      Issue No: Vol. 55, No. 12 (2017)
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