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  Subjects -> ENGINEERING (Total: 2266 journals)
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CHEMICAL ENGINEERING (190 journals)                     

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AATCC Journal of Research     Full-text available via subscription   (Followers: 6)
ACS Sustainable Chemistry & Engineering     Hybrid Journal   (Followers: 4)
Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials     Hybrid Journal   (Followers: 5)
Acta Polymerica     Hybrid Journal   (Followers: 9)
Additives for Polymers     Full-text available via subscription   (Followers: 20)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 7)
Advanced Chemical Engineering Research     Open Access   (Followers: 30)
Advanced Powder Technology     Hybrid Journal   (Followers: 16)
Advances in Applied Ceramics     Hybrid Journal   (Followers: 5)
Advances in Chemical Engineering     Full-text available via subscription   (Followers: 24)
Advances in Chemical Engineering and Science     Open Access   (Followers: 53)
Advances in Polymer Technology     Hybrid Journal   (Followers: 13)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 7)
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: 12)
Anti-Corrosion Methods and Materials     Hybrid Journal   (Followers: 7)
Applied Petrochemical Research     Open Access   (Followers: 2)
Asia-Pacific Journal of Chemical Engineering     Hybrid Journal   (Followers: 7)
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: 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: 8)
Catalysts     Open Access   (Followers: 7)
ChemBioEng Reviews     Full-text available via subscription   (Followers: 1)
Chemical and Engineering News     Free   (Followers: 12)
Chemical and Materials Engineering     Open Access   (Followers: 12)
Chemical and Petroleum Engineering     Hybrid Journal   (Followers: 12)
Chemical and Process Engineering     Open Access   (Followers: 25)
Chemical and Process Engineering Research     Open Access   (Followers: 22)
Chemical Engineering & Technology     Hybrid Journal   (Followers: 32)
Chemical Engineering and Processing: Process Intensification     Hybrid Journal   (Followers: 18)
Chemical Engineering and Science     Open Access   (Followers: 17)
Chemical Engineering Communications     Hybrid Journal   (Followers: 13)
Chemical Engineering Education     Full-text available via subscription  
Chemical Engineering Journal     Hybrid Journal   (Followers: 32)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 22)
Chemical Engineering Research Bulletin     Open Access   (Followers: 11)
Chemical Engineering Science     Hybrid Journal   (Followers: 22)
Chemical Geology     Hybrid Journal   (Followers: 18)
Chemical Papers     Hybrid Journal   (Followers: 2)
Chemical Product and Process Modeling     Hybrid Journal   (Followers: 3)
Chemical Reviews     Full-text available via subscription   (Followers: 164)
Chemical Society Reviews     Full-text available via subscription   (Followers: 41)
Chemical Technology     Open Access   (Followers: 15)
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: 176)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 16)
ChemSusChem     Hybrid Journal   (Followers: 7)
Chinese Chemical Letters     Full-text available via subscription   (Followers: 3)
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  
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: 20)
Corrosion Engineering, Science and Technology     Hybrid Journal   (Followers: 36)
Corrosion Reviews     Hybrid Journal   (Followers: 4)
Crystal Research and Technology     Hybrid Journal   (Followers: 6)
Current Opinion in Chemical Engineering     Open Access   (Followers: 8)
Education for Chemical Engineers     Hybrid Journal   (Followers: 5)
Eksergi     Open Access  
Emerging Trends in Chemical Engineering     Full-text available via subscription   (Followers: 2)
European Polymer Journal     Hybrid Journal   (Followers: 41)
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)
Frontiers of Chemical Science and Engineering     Hybrid Journal   (Followers: 2)
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: 11)
Industrial & Engineering Chemistry Research     Full-text available via subscription   (Followers: 21)
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: 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: 5)
International Journal of Science and Engineering     Open Access   (Followers: 4)
International Journal of Waste Resources     Open Access   (Followers: 4)
Journal of Chemical Engineering & Process Technology     Open Access   (Followers: 4)
Journal of Applied Crystallography     Hybrid Journal   (Followers: 6)
Journal of Applied Electrochemistry     Hybrid Journal   (Followers: 12)
Journal of Applied Polymer Science     Hybrid Journal   (Followers: 116)
Journal of Biomaterials Science, Polymer Edition     Hybrid Journal   (Followers: 9)
Journal of Bioprocess Engineering and Biorefinery     Full-text available via subscription   (Followers: 1)
Journal of Chemical & Engineering Data     Full-text available via subscription   (Followers: 11)
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: 18)
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 Combinatorial Chemistry     Full-text available via subscription  
Journal of Crystallization Process and Technology     Open Access   (Followers: 8)
Journal of Environmental Chemical Engineering     Hybrid Journal   (Followers: 5)
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: 4)
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 Modern Chemistry & Chemical Technology     Full-text available via subscription   (Followers: 2)
Journal of Molecular Catalysis A: Chemical     Hybrid Journal   (Followers: 6)
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: 4)
Journal of Polymer Engineering     Hybrid Journal   (Followers: 9)
Journal of Polymer Research     Hybrid Journal   (Followers: 6)
Journal of Polymer Science Part C : Polymer Letters     Hybrid Journal   (Followers: 6)
Journal of Polymers     Open Access   (Followers: 3)
Journal of Polymers and the Environment     Hybrid Journal   (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: 282)
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: 9)
Jurnal Bahan Alam Terbarukan     Open Access  
Jurnal Inovasi Pendidikan Kimia     Open Access   (Followers: 4)
Jurnal Reaktor     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: 1)
Materials Chemistry and Physics     Full-text available via subscription   (Followers: 15)
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  
Nanocontainers     Open Access  
Nanofabrication     Open Access  
Noise Control Engineering Journal     Full-text available via subscription   (Followers: 3)
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 Processes and Polymers     Hybrid Journal   (Followers: 1)
Plasmas and Polymers     Hybrid Journal  
Polymer     Hybrid Journal   (Followers: 116)
Polymer Bulletin     Hybrid Journal   (Followers: 7)
Polymer Composites     Hybrid Journal   (Followers: 15)
Polyolefins Journal     Open Access  
Powder Technology     Hybrid Journal   (Followers: 14)
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: 60)
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: 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  [2335 journals]
  • Modeling the dynamics of sublimation of fractured rocks in the
           lithospheric mantle wedge beneath volcanoes of the Avacha group
           (Kamchatka)
    • Authors: V. N. Sharapov; G. V. Kuznetsov; V. P. Logachev; V. K. Cherepanova; A. N. Cherepanov
      Pages: 231 - 250
      Abstract: A quantitative analysis of sublimation of intensely fractured rocks in the mantle wedge was performed using a model of planar fracture channel. The use of dimensionless variables allowed us to analyze the influence of the Nusselt and Sherwood criteria on temperature and variation of the rates of dissolution of minerals and films on fracture walls and estimate both linear and mass sublimation rates. The results of this study predict relatively high rates of major element dissolution and remobilization by flows of magmatic and metamorphic gases over wide temperature range. Physical modeling of this process using natural mantle rock samples confirms the plausibility of the proposed model at least for the case of metamorphic-driven remobilization of elements from gas-liquid inclusions in metasomatized ultramafic rocks. This model provides a satisfactory explanation for the observed local heterophase alterations within ultramafic rocks that have experienced multistage deformation beneath volcanoes of the Kamchatka volcanic front.
      PubDate: 2017-03-01
      DOI: 10.1134/s0016702917030065
      Issue No: Vol. 55, No. 3 (2017)
       
  • The role of acidity–basicity in evaporating refractory inclusions in
           chondrites
    • Authors: O. I. Yakovlev; K. M. Ryazantsev; S. I. Shornikov
      Pages: 251 - 256
      Abstract: When melts of Ca–Al inclusions in chondrites, which are dominated by the oxides SiO2, MgO, CaO, and Al2O3, evaporate at high temperatures, the SiO2 and MgO fugacities are inverted: SiO2, which is more volatile than MgO, becomes less volatile when melts rich in refractory CaO and Al2O3 evaporate. This fugacity inversion can be realistically explained within the framework of D.S. Korzhinskii’s theory of acid–base interaction between components in silicate melts. According to this theory, an increase in CaO concentration in the melt increases its basicity, and this, in turn, increases the activity (and hence, also fugacity) of MgO and decreases those of SiO2. In the real compositions of the Ca–Al inclusions in chondrites, the MgO/SiO2 ratio systematically decreases with an increase in the CaO concentration under the effect of acid–base interaction.
      PubDate: 2017-03-01
      DOI: 10.1134/s0016702917020070
      Issue No: Vol. 55, No. 3 (2017)
       
  • Thermochemical study of Mg–Fe chlorites
    • Authors: L. P. Ogorodova; L. V. Mel’chakova; M. F. Vigasina; I. A. Kiseleva; I. A. Bryzgalov
      Pages: 257 - 262
      Abstract: The thermochemical study of two natural trioctahedral Mg–Fe chlorites—clinochlores was carried out using high-temperature melt solution calorimetry with a Tian–Calvet microcalorimeter. The enthalpies of formation of clinochlores of compositions (Mg4.9Fe 0.3 2+ Al0.8)[Si3.2Al0.8O10](OH)8 (–8811 ± 12 kJ/mol) and (Mg4.3Fe 0.7 2+ Al1.0)[Si3.0Al1.0O10](OH)8 (–8696 ± 13 kJ/mol) from elements were determined. The values of the standard entropies and the Gibbs energies of formation of the studied natural minerals as well as thermodynamic properties of Mg–Fe chlorites of theoretical composition were estimated.
      PubDate: 2017-03-01
      DOI: 10.1134/s0016702917030041
      Issue No: Vol. 55, No. 3 (2017)
       
  • Geochemistry and Nd, Sr isotopes of the Pohrenk fluorites
           (Kırsehir-Turkey)
    • Authors: Y. Uras; A. V. Nikiforov; F. Oner; O. Parlak
      Pages: 263 - 281
      Abstract: The Pohrenk fluorite mineralisation which makes up Central Anatolia’s most extensive fluorite region is Lutetian aged, and hosted in carbonate rocks that have undergone occasional karstification and silicification along a N–S fault trend. Fluid inclusion values and the position of fluorites in the Tb/La–Tb/Ca diagram show that mineralisation occurred in a hydrothermal environment with homogenisation temperatures ranging from 78.1–363°C. The presence of fluorite as a space filler in carbonate rocks and its association with silicification indicates that the solutions contained considerable amounts of Si alongside F (fluorine). The Pohrenk fluorite samples have 143Nd/144Nd values of between 0.512349 and 0.512497, whilst 87Sr/86Sr values vary between 0.708161 and 0.708772. These values indicate a mantle origin where continental contamination could occur. When the Nd–Sr values are compared to magmatic and young volcanics, the Pohrenk fluorites are seen to be enriched and exhibit similar isotopic signatures to Upper Cretaceous aged magmatics, Early-Middle Miocene volcanics and Mio-Quaternary volcanics.
      PubDate: 2017-03-01
      DOI: 10.1134/s0016702917030090
      Issue No: Vol. 55, No. 3 (2017)
       
  • Carbonate equilibrium in the water of the Razdol’naya River
    • Authors: P. Ya. Tishchenko; T. A. Mikhailik; G. Yu. Pavlova; P. P. Tishchenko; A. M. Koltunov; Jing Zhang
      Pages: 282 - 293
      Abstract: The paper suggests an accurate approach to studying carbonate equilibrium in the water of the Razdol’naya River. The approach involves measuring pH by Pitzer’s scale, using a cell without liquid junction; measuring the total alkalinity by Bruevich’s technique; and using apparent constants of carbonate equilibrium with regard for the organic alkalinity. The Pitzer technique was employed to calculate the apparent constants of carbonate equilibrium in solution that models the riverine water: Ca(HCO3)2–NaCl–H2O within the range of alkalinity of 0–0.005 mol/kg and temperatures of 0–25°C. Carbonate equilibrium in the water of the Razdol’naya River was sampled for studying at eight sites during all four seasons. Although the contents of biogenic compounds in the water are high, they can merely insignificantly affect the acid–base equilibrium, which is controlled in the riverine water by carbonate equilibrium and the concentrations of humic substances, which play the greater role, the greater the discharge of the river. In addition to the production and destruction of organic matter, carbonate equilibrium in the river is also affected by the supply of humic substances with soil waters and total alkalinity with groundwaters. The fluxes of alkalinity and humic substances annually brought by the Razdol’naya River to Amur Bay are evaluated at 1.33 × 109 mol and 9.9 × 106 kgC, respectively. The carbon dioxide export with the Razdol’naya River is equal to the alkalinity flux and does not depend on the weathering mechanisms.
      PubDate: 2017-03-01
      DOI: 10.1134/s0016702917030089
      Issue No: Vol. 55, No. 3 (2017)
       
  • Fluorine mobilization from rocks under the action of organic acids
    • Authors: A. V. Savenko; V. S. Savenko
      Pages: 294 - 298
      Abstract: This paper presents the results of experimental study of fluorine leaching from rocks of various basicity by distilled water and multicomponent organic acid solution, in which the frequency distribution of dissociation constants of carboxyl groups correspond to that of natural soil solutions. It is shown that organic acids significantly enhance the intensity of fluorine leaching from rocks as compared to distilled water. A positive correlation was established between fluorine and magnesium extracted from different rocks by organic acids (r = 0.92). The correlation between fluorine and other main petrogenic elements is absent. Intensity of fluorine mobilization from rocks under the action of organic acids increases with the growth of basicity of the rocks with decreasing their chemical stability in the following sequence: meimechite > basaltic andesite > albitized rhyodacite > alkaline agpaitic granite.
      PubDate: 2017-03-01
      DOI: 10.1134/s0016702917030053
      Issue No: Vol. 55, No. 3 (2017)
       
  • Specifics of strontium accumulation in the floodplain soils of the Kuda
           River, Irkutsk Region
    • Authors: P. V. Kuznetsov; E. V. Chuparina; O. A. Proidakova; T. S. Aisueva
      Pages: 299 - 305
      Abstract: Data on strontium accumulation acquired by studying the floodplain soils of the Kuda River, Irkutsk Region, show that the bulk accumulation of this element and the accumulation of its water-soluble species are controlled by evaporative concentration. Floodplain areas maximally enriched in water-soluble strontium are defined. These areas are the most potentially hazardous if involved in agricultural activities because Sr can be transferred there into the surface- and soil–groundwaters in concentrations several times higher than the maximum permissible concentrations of this element in water bodies.
      PubDate: 2017-03-01
      DOI: 10.1134/s001670291703003x
      Issue No: Vol. 55, No. 3 (2017)
       
  • Comments on the paper “The nature of “Svecofennian” zircon in the
           Belomorian Mobile Belt and some geological implications” by A.A.
           Shchipanskii and A.I. Slabunov
    • Authors: A. V. Berezin; A. E. Mel’nik; S. G. Skublov
      Pages: 306 - 311
      Abstract: Eclogites were relatively recently found in the Belomorian Mobile Belt (BMB) (Volodichev et al., 2004; Shchipanskii et al., 2005; Konilov et al., 2004). The very first isotopic dates (Volodichev et al., 2004; Mints et al., 2010) were obtained for these rocks in the northwestern (in the Salma and Kuru-Vaara areas) and central (Gridino area) portions of BMB and corresponded to the Archean: approximately 2.72–2.87 Ga. Because no crustal eclogites older that 2.0 Ga (Möller et al., 1995) had been known before these dates were obtained, these eclogites were regarded as unique. It is commonly believed that no crustal eclogites could be formed in the Archean because the crust was then relatively thin (Kröner, 2010), and hence, the find of crustal eclogites of Archean age in BMB called for a fundamental revision of geodynamic reconstructions of the crustal evolution and was one of the main arguments invoked to support the hypothesis that currently operating geodynamic mechanisms of plate tectonic can be extrapolated to the Early Precambrian (Rozen et al., 2008). However, these finds were practically immediately followed by serious doubts that the primary estimates of the timing of the eclogite metamorphism in the Belomorian Belt may be incorrect (Mitrofanov et al., 2009; and others).
      PubDate: 2017-03-01
      DOI: 10.1134/s0016702917030028
      Issue No: Vol. 55, No. 3 (2017)
       
  • On the age of eclogites in the Belomorian Mobile Belt: Reply to the
           comments by A.V. Berezin, A.E. Mel’Nik, and S.G. Skublov on the paper
           “Provenance of “Svecofennian” zircons in the Belomorian Mobile Belt,
           Baltic Shield, and some geodynamic implications” by A.A. Shchipanskii
           and A.I. Slabunov
    • Authors: A. A. Shchipanskii; A. I. Slabunov
      Pages: 312 - 315
      PubDate: 2017-03-01
      DOI: 10.1134/s0016702917030077
      Issue No: Vol. 55, No. 3 (2017)
       
  • Formation of N–С–О–Н molecules and complexes in the
           basalt–basaltic andesite melts at 1.5 Gpa and 1400°C in the presence of
           liquid iron alloys
    • Authors: A. A. Kadik; N. A. Kurovskaya; O. A. Lukanin; Yu. A. Ignat’ev; V. V. Koltashev; E. B. Kryukova; V. G. Plotnichenko; N. N. Kononkova
      Pages: 151 - 162
      Abstract: The contents and speciation of nitrogen, carbon, and hydrogen were determined in basalt–basaltic andesite melts in equilibrium with liquid Fe alloys at 1.5 Gpa, 1400°C, and oxygen fugacity (fO2) 1.4–1.9 log units below that of the Fe–FeO buffer (ΔlogfO2(IW) =–1.4 …–1.9). Experiments were carried out on a piston- cylinder type apparatus using welded Pt capsules in the presence of excess С (graphite). Starting mixture consisted of natural ferrobasaltic glass and silicon nitride (Si3N4) as nitrogen source in the system. Experimental quench products representing glasses with spherical inclusions of iron alloy were analyzed using electron microprobe, Raman, and IR spectroscopy. With increase of Si3N4 in the starting mixture and, respectively, decrease of fO2, silicate melt forming during experiments became depleted in FeO and enriched in SiO2. It was established that the nitrogen content in the glasses increases from 0.13 to 0.44 wt % with decrease of ΔlogfO2(IW) from–1.4 to–1.9, whereas C content in the first approximation remains constant within 1.18–1.13 wt %, while the total water content (ОН– + Н2О) determined by IR spectroscopy decreases from 4.91 to 1.20 wt %. The N (0.13–0.48 wt %) and C (0.75–2.26 wt %) contents determined in the Fe alloy show no clear correlation with fO2. The IR and Raman spectroscopic study of the glasses indicates the formation of molecules and complexes with bonds N–H (NH3, NH2 −, NH2 +, NH4 +), Н–О (Н2О, OH–), С–Н (СН4) as well as N2 and Н2 molecules in silicate melts. IR spectra also reveal the presence of complexes with С=О, С–N bonds and СО2 molecules. Obtained data are compared with results of previous studies on the solubility and speciation of N, С, and Н in the model FeO–Na2O–SiO2–Al2O3 melts in equilibrium with liquid iron alloys at 1.5 GPa (1400°C) and 4 GPa (1550°C) (Kadik et al., 2011, 2015).
      PubDate: 2017-02-01
      DOI: 10.1134/s0016702917020033
      Issue No: Vol. 55, No. 2 (2017)
       
  • Geochemistry and provenances of the Jurassic terrigenous rocks of the
           Upper Amur and Zeya–Dep troughs, eastern Central Asian fold belt
    • Authors: Yu. N. Smirnova; A. A. Sorokin; L. I. Popeko; A. B. Kotov; V. P. Kovach
      Pages: 163 - 183
      Abstract: This paper reports the results of complex geochemical and Sm–Nd isotope-geochemical studies of terrigenous rocks of the Upper Amur and Zeya–Dep troughs, as well as U–Pb geochronological studies of detrital zircons. It is established that the studied troughs have orogenic nature, which is of key significance for understanding the geodynamic evolution of East Asia in the Mesozoic. Such interpretation is consistent with structural features of the troughs (migration of basin axis inward the continent with time, stratigraphic rejuvenation in the same direction), which are typical of foreland basins regarded as analogues of foreland (marginal) troughs. Obtained data indicate that orogenic processes responsible for the formation of the Mongol-Okhotsk fold belt began in the Early Jurassic.
      PubDate: 2017-02-01
      DOI: 10.1134/s0016702917010104
      Issue No: Vol. 55, No. 2 (2017)
       
  • Geochemical controls on the formation of unconformity-type Au–U deposits
           (Northern Transbaikalia)
    • Authors: A. E. Budyak; A. V. Parshin; A. M. Spiridonov; V. N. Reutsky; B. B. Damdinov; M. G. Volkova; Yu. I. Tarasova; V. A. Abramova; N. N. Bryukhanova; O. V. Zarubina
      Pages: 184 - 194
      Abstract: This study provides geochemical, mineralogical, and isotope data for rocks and ores from Lower Proterozoic black shale formations of the Kodar–Udokan structural and formational zone, which host the Khadatkanda gold—uranium deposit. The results indicate that the uranium and gold mineralizations were formed at different times in relation to different geodynamic settings. The gold mineralization is associated with the inception of the Syulban fault and has a juvenile source. The later Th–U mineralization originated during tectonic rejuvenation of the Syulban fault zone, while the sources of radioactive elements were presumably the underlying sediments of the Kodar Group, which are widespread throughout the area of the Baikal mountain region (BMR). Based on the above results, the Au–U mineralization in the study area can be recognized as unconformity-type deposits, analogous to the well-known deposits of Australia and Canada. In this connection, the Baikal mountain region has a good potential for the discovery of Au—U deposits.
      PubDate: 2017-02-01
      DOI: 10.1134/s0016702917010049
      Issue No: Vol. 55, No. 2 (2017)
       
  • Nickel, molybdenum, and cobalt in the black shales of the Bazhenov
           Formation of the West Siberian basin
    • Authors: Yu. N. Zanin; A. G. Zamirailova; V. G. Eder
      Pages: 195 - 204
      Abstract: It was shown that the contents of Ni, Mo, and Co in the siliceous clay black shale rocks of the normal sections of the Bazhenov Formation are several times higher than the global mean contents of these elements in black shales. These rocks have the highest contents of pyrite and organic carbon and show evidence for strongly reducing formation conditions at the slowest background rate of sedimentation of their material. A transition from the siliceous clay rocks to the mudstones of normal section, which are considered as turbidites, and further to the mudstones and clayey silt rocks of the so-called anomalous sections (deposits of submarine deltas and canyons) is accompanied by sequential depletion in pyrite and organic carbon, a decrease in indicators of the reduction level of the sedimentation environment, and an increase in sedimentation rate and clay material content. Simultaneously, the contents of the elements of interest decreases in the sequence Mo > Ni > Co. In the rocks of anomalous sections, the contents of these elements decrease to the level of their mean abundances in clays.
      PubDate: 2017-02-01
      DOI: 10.1134/s0016702917010116
      Issue No: Vol. 55, No. 2 (2017)
       
  • Gypsum solubility in water at 25°C
    • Authors: A. L. Lebedev; V. L. Kosorukov
      Pages: 205 - 210
      Abstract: The analysis of published data and our experimental results showed that the existing estimates of gypsum solubility in water (C m ↑) at 25°C range from 0.0147 to 0.0182 M. Such a scatter (more than 20%) is the result of a combined influence of experimental conditions and ability of gypsum to form supersaturated solutions. This influence appears most noticeable during gypsum dissolution in a dispersed state. Under such conditions, equilibrium is determined with a precision of no better than ±4.5%; if a flat surface similar to natural one is dissolved, the (C m ↑) value is characterized by the minimum scatter (±1%). According to experimental data (25°C), the solubility of gypsum particles in water is inversely proportional to their size at r < 1 μm and is r-invariant for larger grains. The invariance of (C m ↑) at r > 1–5 μm is supported by the data of analytical calculations using the approximate Ostwald–Freundlich equation. It is supposed that the difference of the concentrations of dissolved gypsum at the boundaries of the field of metastable state of gypsum-saturated groundwater can be 1–5%. The results of our study can be used for the description of gypsum dissolution in the models of mass transfer between gypsum-bearing rocks and groundwater.
      PubDate: 2017-02-01
      DOI: 10.1134/s0016702917010062
      Issue No: Vol. 55, No. 2 (2017)
       
  • Behavior of lanthanides during the origin of mineralized domes: an example
           of the Spokoininskoe deposit, Transbaikalia
    • Authors: Yu. A. Popova; S. S. Matveeva; A. Yu. Bychkov; M. E. Ternopol’skaya; Ya. V. Bychkova
      Pages: 211 - 217
      Abstract: The paper reports data on concentrations of lanthanides in rocks, fluorite, and wolframite from the Spokoininskoe greisen deposit in eastern Transbaikalia. Lanthanide concentrations in the ore-forming fluid are calculated using mineral/fluid distribution coefficients. The data on REE are consistent under the assumption of a single, but evolving, genetic source. The REE concentrations are similar for rocks variably affected by greisenization and are controlled by the solubility of monazite contained in the granite. The younger quartz–albite–muscovite veins and segregations contain elevated concentrations of LREE, which is explained by an increase in the monazite solubility in alkaline solutions during the late evolution of the fluid.
      PubDate: 2017-02-01
      DOI: 10.1134/s0016702917010086
      Issue No: Vol. 55, No. 2 (2017)
       
  • Determination of the platinum-group elements and gold in ferromanganese
           nodule reference material NOD-A-1
    • Authors: E. D. Berezhnaya; A. V. Dubinin
      Pages: 218 - 224
      Abstract: The concentrations of Ru, Pd, Ir, Pt, and Au were determined in a ferromanganese nodule reference sample NOD-A-1 by inductively coupled plasma mass-spectrometry. Sample preparation procedures include acid digestion and anion exchange preconcentration. Standard addition method was used to eliminate losses of the analyte during the chromatographic separation. The results are in agreement with previously published data. The low level of intermediate precision for Au between different subsamples of the same sample probably originates from the heterogeneous distribution of Au in ferromanganese nodules. The accumulation of PGE in ferromanganese nodules was studied using international reference samples.
      PubDate: 2017-02-01
      DOI: 10.1134/s0016702917010037
      Issue No: Vol. 55, No. 2 (2017)
       
  • Determination of the enthalpies of formation of some platinum antimonides
           and their phase diagrams under standard conditions
    • Authors: E. G. Osadchii; T. A. Stolyarova; M. V. Voronin; E. A. Brichkina
      Pages: 225 - 229
      Abstract: Using the method of direct synthesis calorimetry, we determined the standard enthalpy of formation of PtSb (stumpflite), Δ f H°298.15 (PtSb, cr) =–105.16 ± 0.84 kJ/mol and PdSb2 (geversite), Δ f H°298.15 (PtSb2,cr) =–160.92 ± 0.84 kJ/mol. Isothermal (298.15 K, p = 1 bar) phase diagrams were computed for the Pt–Sb–S and Pt–Sb–O ternary systems in the coordinates composition of the Pt–Sb binary system versus fugacity of a gaseous volatile component (O2, S2).
      PubDate: 2017-02-01
      DOI: 10.1134/s0016702917010074
      Issue No: Vol. 55, No. 2 (2017)
       
  • Equipment and newly developed methodological approaches for
           isotopic–geochemical studying fluid phases in rocks and minerals
    • Authors: A. I. Buikin; Yu. A. Nevinnyi; A. I. Kamaleeva; V. S. Sevast’yanov; O. V. Kuznetsova
      Pages: 1 - 8
      Abstract: The paper presents data on an original equipment complex, consisting of two apparatuses, designed to prepare rock and mineral samples for the isotopic analysis of their fluid and/or gas inclusions. An example of samples from the Guli alkaline ultramafic massif in the Maimecha–Kutui province, northern central Siberia, is employed to demonstrate the capabilities of the technique of stepwise sample crushing and multiple-isotope analysis of the fluid phase.
      PubDate: 2017-01-01
      DOI: 10.1134/s0016702916130024
      Issue No: Vol. 55, No. 1 (2017)
       
  • New approaches to laser desorption/ionization of chemical compounds for
           geochemical studies
    • Authors: A. A. Grechnikov; A. S. Borodkov; A. V. Pento; N. B. Polyakov; I. I. Kuzmin
      Pages: 19 - 26
      Abstract: Two new versions of surface-assisted laser desorption/ionization method are considered. One version is based on a combination of this method with thermal desorption sample injection and may be applied for determination of chemical compounds that are transformed into a gas phase without decomposition by heating. Another version is based on laser-induced electron-transfer desorption/ionization and could be used for determination of compounds with low proton affinity. The possibilities of the new approaches are illustrated by the example of determination of aminoacids, medical compounds, chlorophyll, as well as gold in sulfide ores.
      PubDate: 2017-01-01
      DOI: 10.1134/s0016702916130061
      Issue No: Vol. 55, No. 1 (2017)
       
  • Partitioning of trace elements in the process of early diagenesis of
           bottom sediments in the White Sea
    • Authors: L. L. Demina; D. F. Bud’ko; T. N. Alekseeva; A. N. Novigatsky; A. S. Filippov; A. I. Kochenkova
      Pages: 144 - 149
      PubDate: 2017-01-01
      DOI: 10.1134/s0016702917010050
      Issue No: Vol. 55, No. 1 (2017)
       
 
 
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