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  Subjects -> ENGINEERING (Total: 2254 journals)
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CHEMICAL ENGINEERING (190 journals)                     

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AATCC Journal of Research     Full-text available via subscription   (Followers: 3)
ACS Sustainable Chemistry & Engineering     Hybrid Journal  
Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials     Hybrid Journal   (Followers: 4)
Acta Polymerica     Hybrid Journal   (Followers: 7)
Additives for Polymers     Full-text available via subscription   (Followers: 20)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 6)
Advanced Chemical Engineering Research     Open Access   (Followers: 27)
Advanced Powder Technology     Hybrid Journal   (Followers: 12)
Advances in Applied Ceramics     Hybrid Journal   (Followers: 4)
Advances in Chemical Engineering     Full-text available via subscription   (Followers: 23)
Advances in Chemical Engineering and Science     Open Access   (Followers: 50)
Advances in Polymer Technology     Hybrid Journal   (Followers: 12)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 6)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 9)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 9)
Anti-Corrosion Methods and Materials     Hybrid Journal   (Followers: 6)
Applied Petrochemical Research     Open Access   (Followers: 2)
Asia-Pacific Journal of Chemical Engineering     Hybrid Journal   (Followers: 7)
Biochemical Engineering Journal     Hybrid Journal   (Followers: 13)
Biofuel Research Journal     Open Access   (Followers: 3)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 11)
Brazilian Journal of Chemical Engineering     Open Access   (Followers: 3)
Bulletin of Chemical Reaction Engineering & Catalysis     Open Access   (Followers: 2)
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 3)
Carbohydrate Polymers     Hybrid Journal   (Followers: 7)
Catalysts     Open Access   (Followers: 6)
ChemBioEng Reviews     Full-text available via subscription  
Chemical and Engineering News     Free   (Followers: 11)
Chemical and Materials Engineering     Open Access   (Followers: 6)
Chemical and Petroleum Engineering     Hybrid Journal   (Followers: 10)
Chemical and Process Engineering     Open Access   (Followers: 19)
Chemical and Process Engineering Research     Open Access   (Followers: 17)
Chemical Engineering & Technology     Hybrid Journal   (Followers: 32)
Chemical Engineering and Processing: Process Intensification     Hybrid Journal   (Followers: 17)
Chemical Engineering and Science     Open Access   (Followers: 13)
Chemical Engineering Communications     Hybrid Journal   (Followers: 11)
Chemical Engineering Journal     Hybrid Journal   (Followers: 26)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 20)
Chemical Engineering Research Bulletin     Open Access   (Followers: 8)
Chemical Engineering Science     Hybrid Journal   (Followers: 19)
Chemical Geology     Hybrid Journal   (Followers: 14)
Chemical Papers     Hybrid Journal   (Followers: 2)
Chemical Product and Process Modeling     Hybrid Journal   (Followers: 3)
Chemical Reviews     Full-text available via subscription   (Followers: 123)
Chemical Society Reviews     Full-text available via subscription   (Followers: 39)
Chemical Technology     Open Access   (Followers: 11)
ChemInform     Hybrid Journal   (Followers: 4)
Chemistry & Industry     Hybrid Journal   (Followers: 2)
Chemistry Central Journal     Open Access   (Followers: 5)
Chemistry of Materials     Full-text available via subscription   (Followers: 141)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 15)
ChemSusChem     Hybrid Journal   (Followers: 5)
Chinese Chemical Letters     Full-text available via subscription   (Followers: 3)
Chinese Journal of Chemical Engineering     Full-text available via subscription   (Followers: 3)
Chinese Journal of Chemical Physics     Hybrid Journal   (Followers: 1)
Coke and Chemistry     Hybrid Journal   (Followers: 1)
Coloration Technology     Hybrid Journal  
Computational Biology and Chemistry     Hybrid Journal   (Followers: 9)
Computer Aided Chemical Engineering     Full-text available via subscription   (Followers: 1)
Computers & Chemical Engineering     Hybrid Journal   (Followers: 9)
CORROSION     Full-text available via subscription   (Followers: 19)
Corrosion Engineering, Science and Technology     Hybrid Journal   (Followers: 35)
Corrosion Reviews     Hybrid Journal   (Followers: 3)
Crystal Research and Technology     Hybrid Journal   (Followers: 5)
Current Opinion in Chemical Engineering     Open Access   (Followers: 6)
Education for Chemical Engineers     Hybrid Journal   (Followers: 4)
Eksergi     Open Access  
Emerging Trends in Chemical Engineering     Full-text available via subscription  
European Polymer Journal     Hybrid Journal   (Followers: 40)
Fibers and Polymers     Full-text available via subscription   (Followers: 4)
Fluorescent Materials     Open Access   (Followers: 1)
Focusing on Modern Food Industry     Open Access   (Followers: 2)
Frontiers of Chemical Science and Engineering     Hybrid Journal   (Followers: 1)
Gels     Open Access  
Geochemistry International     Hybrid Journal   (Followers: 2)
Handbook of Powder Technology     Full-text available via subscription   (Followers: 3)
Heat Exchangers     Open Access   (Followers: 1)
High Performance Polymers     Hybrid Journal  
Hungarian Journal of Industry and Chemistry     Open Access  
Indian Chemical Engineer     Hybrid Journal   (Followers: 5)
Indian Journal of Chemical Technology (IJCT)     Open Access   (Followers: 9)
Indonesian Journal of Chemical Science     Open Access  
Industrial & Engineering Chemistry     Full-text available via subscription   (Followers: 9)
Industrial & Engineering Chemistry Research     Full-text available via subscription   (Followers: 20)
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 and Petroleum Sciences     Open Access   (Followers: 2)
International Journal of Chemical Engineering     Open Access   (Followers: 6)
International Journal of Chemical Reactor Engineering     Hybrid Journal   (Followers: 2)
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  
International Journal of Polymeric Materials     Hybrid Journal   (Followers: 5)
International Journal of Science and Engineering     Open Access   (Followers: 4)
International Journal of Waste Resources     Open Access   (Followers: 3)
Journal of Chemical Engineering & Process Technology     Open Access   (Followers: 4)
Journal of Applied Crystallography     Hybrid Journal   (Followers: 5)
Journal of Applied Electrochemistry     Hybrid Journal   (Followers: 10)
Journal of Applied Polymer Science     Hybrid Journal   (Followers: 103)
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: 10)
Journal of Chemical and Biological Interfaces     Full-text available via subscription   (Followers: 1)
Journal of Chemical Ecology     Hybrid Journal   (Followers: 6)
Journal of Chemical Engineering     Open Access   (Followers: 13)
Journal of Chemical Engineering and Materials Science     Open Access   (Followers: 2)
Journal of Chemical Science and Technology     Open Access   (Followers: 4)
Journal of Chemical Sciences     Partially Free   (Followers: 17)
Journal of Chemical Technology & Biotechnology     Hybrid Journal   (Followers: 10)
Journal of Chemical Theory and Computation     Full-text available via subscription   (Followers: 15)
Journal of CO2 Utilization     Hybrid Journal   (Followers: 2)
Journal of Coatings     Open Access   (Followers: 4)
Journal of Crystallization Process and Technology     Open Access   (Followers: 7)
Journal of Environmental Chemical Engineering     Hybrid Journal   (Followers: 3)
Journal of Food Measurement and Characterization     Hybrid Journal  
Journal of Food Processing & Technology     Open Access  
Journal of Fuel Chemistry and Technology     Full-text available via subscription   (Followers: 4)
Journal of Fuels     Open Access  
Journal of Geochemical Exploration     Hybrid Journal  
Journal of Industrial and Engineering Chemistry     Hybrid Journal   (Followers: 1)
Journal of Information Display     Hybrid Journal  
Journal of Inorganic and Organometallic Polymers and Materials     Partially Free   (Followers: 6)
Journal of Modern Chemistry & Chemical Technology     Full-text available via subscription   (Followers: 2)
Journal of Molecular Catalysis A: Chemical     Hybrid Journal   (Followers: 5)
Journal of Non-Crystalline Solids     Hybrid Journal   (Followers: 7)
Journal of Organic Semiconductors     Open Access   (Followers: 4)
Journal of Physics and Chemistry of Solids     Hybrid Journal   (Followers: 5)
Journal of Polymer and Biopolymer Physics Chemistry     Open Access   (Followers: 4)
Journal of Polymer Engineering     Hybrid Journal   (Followers: 8)
Journal of Polymer Research     Hybrid Journal   (Followers: 6)
Journal of Polymer Science Part C : Polymer Letters     Hybrid Journal   (Followers: 5)
Journal of Polymers     Open Access   (Followers: 2)
Journal of Polymers and the Environment     Hybrid Journal   (Followers: 1)
Journal of Powder Technology     Open Access   (Followers: 1)
Journal of Pure and Applied Chemistry Research     Open Access   (Followers: 1)
Journal of the American Chemical Society     Full-text available via subscription   (Followers: 234)
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: 1)
Journal of the Pakistan Institute of Chemical Engineers     Open Access   (Followers: 1)
Journal of the Taiwan Institute of Chemical Engineers     Hybrid Journal   (Followers: 2)
Journal of Water Chemistry and Technology     Hybrid Journal   (Followers: 8)
Jurnal Bahan Alam Terbarukan     Open Access  
Jurnal Inovasi Pendidikan Kimia     Open Access  
Jurnal Teknologi Dan Industri Pangan     Open Access   (Followers: 1)
Korean Journal of Chemical Engineering     Hybrid Journal   (Followers: 3)
Main Group Metal Chemistry     Hybrid Journal   (Followers: 1)
Materials Chemistry and Physics     Full-text available via subscription   (Followers: 14)
Materials Science and Applied Chemistry     Open Access  
Materials Sciences and Applied Chemistry     Full-text available via subscription  
Molecular Imprinting     Open Access  
MRS Communications     Hybrid Journal  
Nanocontainers     Open Access  
Nanofabrication     Open Access  
Noise Control Engineering Journal     Full-text available via subscription   (Followers: 2)
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: 3)
Plasma Processes and Polymers     Hybrid Journal  
Plasmas and Polymers     Hybrid Journal  
Polymer     Hybrid Journal   (Followers: 94)
Polymer Bulletin     Hybrid Journal   (Followers: 7)
Polymer Composites     Hybrid Journal   (Followers: 13)
Polyolefins Journal     Open Access  
Powder Technology     Hybrid Journal   (Followers: 12)
Recyclable Catalysis     Open Access   (Followers: 1)
Research on Chemical Intermediates     Hybrid Journal  
Reviews in Chemical Engineering     Hybrid Journal   (Followers: 5)
Revista Cubana de Química     Open Access  
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: 56)
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: 5)
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: 3)
The Chemical Record     Hybrid Journal   (Followers: 1)
Theoretical Foundations of Chemical Engineering     Hybrid Journal   (Followers: 2)
Transition Metal Chemistry     Hybrid Journal   (Followers: 2)
Transylvanian Review of Systematical and Ecological Research     Open Access  
Visegrad Journal on Bioeconomy and Sustainable Development     Open Access   (Followers: 1)
Zeitschrift für Naturforschung B : A Journal of Chemical Sciences     Open Access   (Followers: 1)

           

Journal Cover Geochemistry International
  [SJR: 0.491]   [H-I: 14]   [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  [2335 journals]
  • Age and geochemistry of zircon from the oldest metamorphic rocks of the
           Omolon Massif (Northeast Russia)
    • Authors: V. V. Akinin; I. L. Zhulanova
      Pages: 651 - 659
      Abstract: Abstract This study provides SHRIMP-RG data on zircons from garnet gedritites, the products of retrograde metamorphism of eclogite-like rocks constituting belonging to the basement of the Omolon Massif. The earliest episode recorded by oscillatory-zoned cores having high HREE and Ti contents occurred at 3.25–3.22 Ga (Paleoarchean) and is interpreted to represent an upper age limit of a metamorphic or magmatic protolith. One zircon core with a pronounced negative Eu anomaly yielded a concordant age of 2.6 Ga, which is interpreted to mark a Neoarchean episode of granite formation. The studied population of zircons provides the most distinct record of a Paleoproterozoic (1.9 Ga) event, which is marked by formation of garnet gedritites under amphibolite-facies conditions. This event is recorded by transparent recrystallization rims of preexisting large zircon grains and small newly-formed grains, which are characterized, compared with their cores, by lower crystallization temperatures and one order of magnitude lower concentrations of U, Th, and HREE, and the presence of garnet micro-inclusions.
      PubDate: 2016-08-01
      DOI: 10.1134/s0016702916060021
      Issue No: Vol. 54, No. 8 (2016)
       
  • Chlorine partitioning between melt and aqueous chloride fluid phase during
           granite magma degassing. Part II. Crystallization-induced degassing of
           melts
    • Authors: O. A. Lukanin
      Pages: 660 - 680
      Abstract: Abstract An empirical computer model was developed to describe granite magma degassing and the partitioning behavior of Cl between melts and aqueous chloride fluids that formed during eutectic isobaric crystallization of magmas at pressures from 4 to 0.4 kbar and a temperature of 800 ± 25°C. This model is the extensions of the earlier model describing the decompression degassing of granite melts (Lukanin, 2015). The numerical modeling was performed for both closed-system conditions, when fluid remains in the system, and open-system conditions, when fluid is removed from the system. The results of numerical modeling revealed the main factors controlling the behavior of Cl during crystallization-induced degassing, such as the initial contents of Cl and H2O of the melts, pressure, and the degree of system openness. At high pressures (>1.6 kbar), isobaric crystallization is accompanied by a decrease in the concentrations of Cl in the melt (C Cl m ) and fluid phase (C Cl fl ). This tendency becomes even more pronounced in an open-system with increasing pressure and initial Cl content. A decrease in pressure in the range of 1.62–0.85 kbar results in a drastic change in the Cl behavior: the trend of C Cl fl and C Cl fl decrease dominating during crystallization at high pressures changes to the opposite. At low pressures (<0.85 kbar), the enrichment of the residual melts and released fluids in Cl leads at a certain stage of crystallization to the formation of a heterogeneous fluid consisting of two immiscible aqueous chloride phases, a waterdominated aqueous phase and a chloride-rich liquid (brine).
      PubDate: 2016-08-01
      DOI: 10.1134/s0016702916080061
      Issue No: Vol. 54, No. 8 (2016)
       
  • Distribution of structural impurities and fluid microinclusions in cubic
           and coated diamond crystals from the Udachnaya pipe, Yakutia, Russia
    • Authors: I. N. Bogush; Z. V. Spetsius; O. E. Koval’chuk; B. S. Pomazanskiy
      Pages: 681 - 690
      Abstract: Abstract FTIR microspectroscopic data were used to construct two-dimension maps showing the distribution of structural impurities and mineral microinclusions in cubic and coated octahedral diamond crystals from the Udachnaya kimberlite pipe in Yakutia. Elevated concentrations of hydrogen and total nitrogen are detected in parts corresponding to the early growth of single-episode growth regions of diamond crystals. These concentrations decrease toward the peripheral portions of these regions. The microinclusions contain water and polyphase mineral associations that preserve a high residual pressure. Microinclusions in the coats of octahedral diamond crystals are dominated by silicates, in which the intensity of IR spectral bands increases toward the peripheries, whereas the cubes posses irregularly distributed domains rich in these phases. The carbonate phases of the microinclusions are distributed according to growth zones of the crystals, and their distribution is often not correlated with the concentrations of structural impurities. The facts that microinclusions in the diamond cuboids are dominated by carbonates and that the rims of the octahedra are dominated by silicates suggest that the diamonds crystallized from dominantly carbonate and silicate fluids/ melts, respectively. The chemical composition of the microinclusions point to an eclogitic paragenesis of the crystals. Facts are obtained that provide support for the earlier hypothesis that cubic diamond crystals and coated octahedral crystals grow at metasomatic interaction between deep fluids and eclogitic rocks in the lithospheric mantle.
      PubDate: 2016-08-01
      DOI: 10.1134/s0016702916080048
      Issue No: Vol. 54, No. 8 (2016)
       
  • Gallium concentration in natural melts and fluids
    • Authors: V. Yu. Prokof’ev; V. B. Naumov; V. A. Dorofeeva
      Pages: 691 - 705
      Abstract: Abstract We generalize, for the first time, published and original data on the gallium concentrations in natural magmatic melts and fluids obtained by studying quenched glasses in volcanic rocks and inclusions in minerals. Based on 2688 determinations, gallium concentrations in magmatic melts vary between 0.47 and 495 ppm at average content of 18.0 ppm (+4.2/–3.4). Gallium concentrations in magmatic melts generated in different geodynamic settings show different distribution. Minimum concentrations (on average, 16.0 ppm, +3.6/–2.9) are typical of the island-arc melts, while maximum contents were determined in melts of oceanic islands (on average, 29.1 ppm, +13.4/–9.2) and intracontinental rifts and hot spots (26.5 ppm, +25.4/–13.0). Published and new 339 determinations of gallium concentrations in natural fluids indicate the wider range of their variations as compared to those of melts: from 0.02 to 11260 ppm, at average 1.6 ppm (+10.8–1.4). The possible gallium fractionation in fluid—magmatic systems is discussed.
      PubDate: 2016-08-01
      DOI: 10.1134/s0016702916080097
      Issue No: Vol. 54, No. 8 (2016)
       
  • Computer simulation of the transformation of natural living matter into
           kerogen
    • Authors: B. N. Ryzhenko; E. S. Sidkina; E. V. Cherkasova
      Pages: 706 - 711
      Abstract: Abstract Thermodynamic simulation of the system living matter (algae, zooplankton, or green plants) + mineral matter (25% carbonates + 75% clay minerals) + standard seawater at temperatures and pressure corresponding to diagenesis indicates that kerogen can be synthesized, together with hydrocarbons and carbon dioxide, in the reaction mix. The removal of CO2(g) and N2(g) from the system is favorable for the reaction Δ1C292H288O12 (s; H/C = 0.99, O/C = 0.041) → Δ2C128H68O7 (s; H/C = 0.53, O/C = 0.055) + xСH4(aq) + yCO2(aq) + zH2O, whose constant and stoichiometric coefficients were calculated based on the simulation results. It is demonstrated that a pressure increase is favorable, while a temperature increase is not, for the procedure of this reaction at P-T parameters of diagenesis: log K =–567 (20°C, 35 bar), 1170 (20°C, 200 bar),–1530 (20°C, 60 bar), and +1030 (20°C, 600 bar).
      PubDate: 2016-08-01
      DOI: 10.1134/s0016702916080115
      Issue No: Vol. 54, No. 8 (2016)
       
  • Analysis of accumulation conditions of minor elements in mineral waters:
           An example of hydrocarbonate sodic waters of the Nagutskoe mineralized
           groundwater field
    • Authors: O. A. Limantseva; E. G. Potapov; S. P. Danilov; E. V. Cherkasova
      Pages: 712 - 718
      Abstract: Abstract Computer simulations of carbon dioxide leaching of Aptian–Albian sandstone at the Nagutskoe groundwater field, Caucasian Mineral Waters, are compared with laboratory experimental data obtained using a high-pressure autoclave under parameters close to conditions under which mineral waters are formed at the Nagutskoe and Essentuki fields (temperatures 20–25 and 65–70°C, carbon dioxide pressure up to 4.04 MPa). The solvents were distilled water and naturally occurring groundwaters from the Caucasian Mineral Waters (CMW) area, individual experimental runs lasted for 2 h, the starting material (rock) was crushed to 0.25 mm, and the gas phase was carbon dioxide. In most of the experiments, the solid: liquid phase (R/W) ratio was 1: 5 and was varied from 1: 10 to 1: 100 in other experiments. Our simulation results indicate that multiple-cycle (10 cycles) leaching leads to an increase in mineralization from 1.3 g/L to 4 g/L and transformation of the geochemical type of the waters from the hydrocarbonate calcic–sodic one (leaching cycle 1) to chloride–hydrocarbonate sodic (cycles 5 and later). The mineralization increased mostly because the and Na+ ions are transferred into solution at an insignificant increase in the Cl concentration and a practically unchanging concentrations of the sulfate, calcium, and magnesium ions. With regard for the averaged mineralogical composition of the sandstone (quartz, feldspars, mica, glauconite, magnetite, ilmenite, garnet, rutile, zircon, and tourmaline) used in our thermodynamic simulations, we arrived at the conclusion that the chemical compositions of the waters, including their minor-element compositions, are controlled by (i) the composition of the cement (clay, calcareous, siliceous, limonitic, chloritic, zeolitic, phosphate, sulfate, or mixed) of the rocks, (ii) weight percentages of minerals containing certain elements, and (iii) temperature, at a given composition of the gas phase of the simulated system (silty sandstone–rainwater–CO2 gas phase).
      PubDate: 2016-08-01
      DOI: 10.1134/s001670291608005x
      Issue No: Vol. 54, No. 8 (2016)
       
  • Experimental modeling of the immobilization of heavy metals at the
           carbonate adsorption–precipitation geochemical barrier
    • Authors: A. V. Savenko
      Pages: 719 - 731
      Abstract: Abstract Experimental data obtained on the adsorption–precipitation immobilization of heavy metals (Cu, Zn, Pb, Cd, Co, and Ni) from acidic and neutral solutions by calcite and dolomite demonstrate that interaction of solutions of heavy metals with these minerals at pH > 7.8–8.1 leads to a significant decrease in the concentrations of the metals because of the crystallization of carbonates of these metals. Except Pb, which is equally removed from solutions by both minerals, the immobilization efficiency of the metals on dolomite is greater than on calculate at the same pH. Residual Zn, Cd, Co, and Ni concentrations are immobilized by chemosorption, which is the most efficient for Cd and less significant for Co, Ni, and Zn. It is proved that artificial geochemical barriers on the basis of carbonate rocks can be efficiently applied to protect environment from contamination with heavy metals.
      PubDate: 2016-08-01
      DOI: 10.1134/s0016702916060069
      Issue No: Vol. 54, No. 8 (2016)
       
  • Behavior of lanthanides during the formation of the Svetloe deposit,
           Chukotka
    • Authors: Yu. A. Popova; A. Yu. Bychkov; S. S. Matveeva
      Pages: 732 - 738
      PubDate: 2016-08-01
      DOI: 10.1134/s0016702916060057
      Issue No: Vol. 54, No. 8 (2016)
       
  • Tectonic setting discrimination diagrams for terrigenous rocks: a
           comparison
    • Authors: A. V. Maslov; V. N. Podkovyrov; G. A. Mizens; A. D. Nozhkin; A. M. Fazliakhmetov; A. I. Malinovsky; A. K. Khudoley; L. N. Kotova; A. V. Kuptsova; E. Z. Gareev; R. I. Zainullin
      Pages: 569 - 583
      Abstract: Abstract An attempt is made to compare discrimination diagrams of the first (mid-1980s) and second (early 2010s) generations compiled using data for sedimentary successions of different ages. Our results suggest that the diagrams of different generations allow more or less correct discrimination only between the platform, rift, passive margin, and island arc settings. The data for collision sediments do not form separate fields in these diagrams.
      PubDate: 2016-07-01
      DOI: 10.1134/s0016702916060033
      Issue No: Vol. 54, No. 7 (2016)
       
  • The influence of low aluminum concentrations on the composition and
           conditions of crystallization of majorite–knorringite garnets:
           Experiment at 7.0 GPa and 1500–1700°C
    • Authors: E. A. Sirotkina; A. V. Bobrov; A. A. Kargal’tsev; Yu. A. Ignat’ev; A. A. Kadik
      Pages: 584 - 593
      Abstract: Abstract Crystallization of garnet in high-chromium restite formed under the conditions of partial melting in the spinel facies and subsequently subducted into the garnet depth facies was studied experimentally in the MgO–Al2O3–Cr2O3–SiO2 system. The crystallization of garnet and the dependence of its composition on the temperature and bulk composition of the system with low Al concentration were studied as well. Experiments in the knorringite–majorite–pyrope system with 5, 10, and 20 mol % Prp were carried out at 7 GPa. The phase associations for the starting composition of pure knorringite Mg3Cr2Si3O12 included chromiumbearing enstatite MgSiO3 (up to 3.2 wt % Cr2O3) and eskolaite Cr2O3. Addition of Al resulted in crystallization of high-chromium majoritic garnet. The portion of garnet in the samples always exceeded the concentration of pyrope in the starting composition owing to the formation of the complex majorite–knorringite–pyrope series of solid solutions. With increasing content of pyrope (from 5 to 20 mol %) and increasing temperature, the modal concentration of garnet increased significantly (from 6–12 to 22–37%). The garnet was characterized by high concentrations of the pyrope (23–80 mol %) and knorringite (22–70 mol %) components. The excess of Si (>3 f.u.) with decreasing Cr concentration provided evidence for the contribution of the majorite–knorringite trend to the variation in garnet composition. On the basis of the natural data, most of the garnets composing xenoliths of ultrabasic rocks in kimberlites and occurring as inclusions in diamonds are low-chromium; i.e., their protolith was not subjected to partial melting, at least in the spinel depth facies.
      PubDate: 2016-07-01
      DOI: 10.1134/s0016702916070090
      Issue No: Vol. 54, No. 7 (2016)
       
  • Geochemistry and isotopic ages of granitoids of the Bashkirian
           Mega-Anticlinorium: Evidence for several pulses of tectono–magmatic
           activity at the junction zone between the Uralian orogen and East European
           Platform
    • Authors: G. Yu. Shardakova
      Pages: 594 - 608
      Abstract: Abstract The study provides the first evidence for post-Riphean phases of granite emplacement in the Bashkirian Mega-Anticlinorium (BMA) at the boundary between the East European Platform and Uralian orogen. The tectono-thermal activity in the BMA is well-constrained by emplacement of the Kusa–Kopan plagiogranitoid intrusion (660 Ma) and late gneiss–granites of the Yurma complex (540 Ma). The geochemical features of these rocks are transitional between within-plate rift and orogenic suites. It was shown that the Paleozoic stage of the BMA was marked by emplacement of granites of the Kialim massif (314 Ma) and Semibratka complex (300 Ma). The age and geochemical features of these rocks are similar to those of Carboniferous granites of the Uralian orogen, which are interpreted to mark the end of subduction and beginning of collision. This similarity suggests that the BMA was adjoined to the Uralian orogen in the Carboniferous and Paleozoic granite emplacement in both structures was the result of their common geological evolution and protoliths of a similar geochemical composition.
      PubDate: 2016-07-01
      DOI: 10.1134/s0016702916070089
      Issue No: Vol. 54, No. 7 (2016)
       
  • Effect of redox conditions on iron metal phase segregation during
           experimental high-temperature centrifuge modeling of the origin of the
           Moon’s core
    • Authors: E. B. Lebedev; V. V. Averin; O. A. Lukanin; I. A. Roshchina; N. N. Kononkova; E. A. Zevakin
      Pages: 609 - 617
      Abstract: Abstract The possible origin of the Moon’s metallic core at the precipitation of iron–sulfide phases during the partial melting of ultramafic material under various redox conditions was experimentally modeled by partially melting the model system olivine (85 wt %) + ferrobasalt (10 wt %) + metallic phase Fe95S5 (wt %) in a high-temperature centrifuge at 1430–1450°C. The oxygen fugacity fO2 was determined from the composition of the quenched experimental silicate melts (glasses). A decrease in fO2 is proved to be favorable for the segregation of iron–sulfide melt from the silicate matrix. The metallic phase is most effectively segregated in the form of melt droplets, and these droplets are accumulated in the lower portions of the samples under strongly reduced conditions, at fO2 ∼ 4.5–5.5 orders of magnitude lower than the iron–wüstite buffer.
      PubDate: 2016-07-01
      DOI: 10.1134/s0016702916070053
      Issue No: Vol. 54, No. 7 (2016)
       
  • Formation of adakitic granitoids in the collisional orogens: Evidence from
           
    • Authors: S. V. Efremov; S. I. Dril’; G. P. Sandimirova
      Pages: 618 - 623
      Abstract: Abstract The classical models of adakite formation by melting of basaltic layer of oceanic lithosphere in the subduction zone were verified using geochemical and Sr–Nd isotope data on the Early Paleozoic granitoids of Eastern Sayan. The presence of adakites in fold belts is usually regarded as geochemical proxy for paleogeodynamic reconstruction. The formation of felsic derivatives with adakitic signatures in the collisional orogens is inconsistent with these models and requires their revision. It is shown that the composition of the granitoids and their evolution cannot be described with these models. In order to solve this problem, two hypotheses of granitoid formation by mixing of two geochemically contrasting reservoirs were proposed and verified. According to the first hypothesis, the granitoids represent the mixing products between alkaline olivine basalts and partial melts of the gray gneiss basement of this region. The second model relates the formation of the granitoids with melting of geochemically 2700 Ma-old enriched source in the subcontinental lithospheric mantle. In spite of differences, both these hypotheses are based on the remobilization of sources formed at the previous stages of the geological evolution of the region. In both cases, adakitic geochemical characteristics of forming felsic magmas are determined by the composition of protolith rather than by their geodynamic position. Obtained preliminary results place constraints on genetic models and geochemical reservoirs participating in the formation of the granitoids.
      PubDate: 2016-07-01
      DOI: 10.1134/s0016702916070028
      Issue No: Vol. 54, No. 7 (2016)
       
  • Solubility and migration ability of rhodium in natural conditions: model
           experimental data
    • Authors: I. Ya. Koshcheeva; I. V. Kubrakova; N. V. Korsakova; O. A. Tyutyunnik
      Pages: 624 - 632
      Abstract: Abstract The contents of dissolved rhodium species in the near-neutral environments have been studied for the first time and data on the interaction of Rh with organic matters of natural waters and its sorption behavior during contact with the components of geochemical barriers were obtained. The solubility method was used to analyze the behavior of rhodium hydroxide in the Rh(OH) x –H2O and Rh(OH) x –H2O–FA (fulvic acids) systems. The possible contents of inorganic species of rhodium and its compounds with humic organic ligands were determined within the pH range typical of surface waters. The solubility of rhodium shows a twoorder- of magnitude increase in the presence of humic matters (FA). The sorption interaction of the soluble rhodium species with the main components of geochemical barriers such as iron oxyhydroxides (III), (including fulvic-acid modified ones), alumosilicates, and precipitates of humic acids in contact with natural waters was studied. It was revealed that rhodium has the high affinity to all studied materials; its species are sorbed by ferrihydrite within several hours. It is suggested that rhodium is mainly transferred as colloid with suspended particulate matters of waters and then is accumulated in bottom sediments. The differences revealed in the sorption behavior of Pt(IV), Pd(II) and Rh(III) may be used to predict the distribution of the considered platinum group elements between the components of ecosystems.
      PubDate: 2016-07-01
      DOI: 10.1134/s0016702916050049
      Issue No: Vol. 54, No. 7 (2016)
       
  • Leaching rare-earth and radioactive elements from alkaline rocks of the
           Lovozero Massif, Kola Peninsula
    • Authors: V. N. Ermolaeva; A. V. Mikhailova; L. N. Kogarko; G. M. Kolesov
      Pages: 633 - 639
      Abstract: Abstract The paper presents data on the leaching efficiency of rare-earth (La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu) and radioactive (Th and U) elements by various reagents from alkaline rocks of the Lovozero Massif. Element concentrations were analyzed by ICP-MS and instrumental neutral activation (INAA). A new complex technique is suggested for analyzing elements on the solid phase of polymer hydrogels. This technique makes it possible to enhance the sensitivity and selectivity of INAA when these elements are simultaneously contained in rocks. Data are presented on the selective leaching of trace elements and the application of environmentally safe reagents.
      PubDate: 2016-07-01
      DOI: 10.1134/s001670291607003x
      Issue No: Vol. 54, No. 7 (2016)
       
  • Experimental study of gallium oxide solubility in chloride solutions at
           300–400°C
    • Authors: M. E. Tarnopolskaia; A. Yu. Bychkov; Yu. V. Shvarov
      Pages: 640 - 644
      PubDate: 2016-07-01
      DOI: 10.1134/s0016702916070107
      Issue No: Vol. 54, No. 7 (2016)
       
  • Enthalpy of formation of natural polyhalite
    • Authors: L. P. Ogorodova; M. F. Vigasina; L. V. Mel’chakova; I. A. Bryzgalov; D. A. Ksenofontov
      Pages: 645 - 649
      PubDate: 2016-07-01
      DOI: 10.1134/s0016702916070077
      Issue No: Vol. 54, No. 7 (2016)
       
  • Geochemistry and petrogenesis of the Late Mesozoic–Early Cenozoic
           volcanic rocks of the Okhotsk and Japan marginal seas
    • Authors: T. A. Emel’yanova; E. P. Lelikov
      Pages: 509 - 521
      Abstract: Abstract The results of ICP-MS trace-element (LILE, HFSE, REE) study of the Late Mesozoic–Early Cenozoic volcanic rocks of the Okhotsk and Japan seas and geochronological K-Ar dating of the Eocene volcanic rocks are presented. Specifics of volcanism developed on submarine rises of these seas was characterized for the first time, and magma sources and geodynamic settings of the volcanic complexes predating the formation of the deep-water basins were determined. It is established that the Late Mesozoic magmas were formed in a subduction setting from spinel peridotites of suprasubduction mantle wedge, which was metasomatically reworked by aqueous fluids that were released by dehydration of sedimentary layer of subducting oceanic plate. This follows from the elevated concentrations of H2O, alkalis, potassium, LILE and LREE, and lowered HFSE (including Ta-Nb minimum) and HREE contents, at lowered Sm/Yb, Nb/Ta, Nb/Y and elevated La/Nb, Ba/La, and Zr/Y ratios. Eocene adakite-like volcanic rocks were identified for the first time in the Sea of Okhotsk. They vary from andesitic to more felsic compositions with elevated MgO (>4%) and elevated La/Yb (>14) and Sr/Y (50–60) ratios. Identification of adakite-like volcanic rocks serves as evidence in support of the transform continental-margin (or plate sliding) setting, which is characterized by breaking apart of subduction slab and formation of slab “windows” acting as pathways for the transfer of asthenospheric mantle into continental lithosphere. New geochemical data on the Late Mesozoic–Early Cenozoic volcanic rocks of the Okhotsk and Japan seas and analysis of literature data were used to distinguish two geodynamic settings within these seas: subduction and transform margin. Similar settings operated at that time in the adjacent continental- margin volcanic belts (Akinin and Miller, 2011; Martynov and Khanchuk, 2013; et al.).
      PubDate: 2016-06-01
      DOI: 10.1134/s0016702916040030
      Issue No: Vol. 54, No. 6 (2016)
       
  • Comparative analysis of radioactive cesium wash-off from contaminated
           catchment areas after accidents at the Fukushima Dai-ichi and Chernobyl
           nuclear power plants
    • Authors: A. V. Konoplev
      Pages: 522 - 528
      Abstract: Abstract The paper presents quantitative data on radiocesium wash-off (dissolved and particulate) from catchment areas after the accident at the Fukushima-1 nuclear power plant. The evaluations are conducted based on published data on radiocesium monitoring in streams in the accident zone and monitoring at standard USLE plots. The characteristics of radiocesium wash-off and its distribution coefficient in riverine waters and surface runoff are analyzed by comparing data obtained on the territories of the Fukushima and Chernobyl accidents within a few years after the accidents. The normalized radiocesium wash-off coefficients in solution for the Fukushima river catchment area are one to two orders of magnitude lower than the analogous values for the Chernobyl catchment area. The normalized wash-off coefficients of radiocesium on particulate matter in the Fukushima and Chernobyl catchment areas are comparable. However, at least twice higher mean annual precipitation and steeper slopes in the Fukushima catchment area result in a higher annual wash-off coefficient than that of the Chernobyl area. It is demonstrated that characteristics of radiocesium wash-off obtained at USLE plots can be utilized to evaluate the scales of natural catchment areas.
      PubDate: 2016-06-01
      DOI: 10.1134/s0016702916040042
      Issue No: Vol. 54, No. 6 (2016)
       
  • The geothermal model of Mersin (Turkey) region
    • Authors: Y. Uras; M. Dag
      Pages: 559 - 568
      Abstract: Abstract The purpose of the study is to present the geothermal model of Mersin (Camili) region geothermal area with its geology, hydrogeology, hydrogeochemistry and isotope hydrology. The 1/25000 scale geology map obtained from the literature research is revised. In order to obtain a geothermal model, geological crosssections are extracted in certain points on the revised geology map. There are 3 hot water outlets. There are MC-1, C-1 and Uclu Cesme deep drillings. MC-1 well is 420 m, approximately 43.6°C temperature and 35 L/s flow rate and C-1 is 150 m, 40.3°C and 35 L/s. There is no exact information about the depth of Uclu Cesme well, but its average temperature is 37.5°C and it has a very low flow rate. Isotope analyses of the water samples obtained from these three wells and the Icme Dere are carried out by using the IRMS method with δ18O–δ2H (Deuterium) and IAEA method with 3H (Tritium). Radioactive Alpha-Beta determination and Physico-chemical and Bacteriological analyses of MC-1 well are made by using EPA 900.00. δ18O–δ2H isotope ratios clearly indicate a meteoric origin for the waters. In the light of all this information, the revised 1/25000 scare geology map of Mersin Guneyyolu (Camili) geothermal area is obtained; it is found out that hot waters are of meteoric origin; and the isotope hydrology and hydro-chemical assessment of the area is conducted to shape the geothermal model.
      PubDate: 2016-06-01
      DOI: 10.1134/s0016702916060070
      Issue No: Vol. 54, No. 6 (2016)
       
 
 
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