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CHEMICAL ENGINEERING (183 journals)                  1 2     

AATCC Journal of Research     Full-text available via subscription   (Followers: 3)
Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials     Hybrid Journal   (Followers: 4)
Acta Polymerica     Hybrid Journal   (Followers: 6)
Additives for Polymers     Full-text available via subscription   (Followers: 20)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 5)
Advanced Chemical Engineering Research     Open Access   (Followers: 9)
Advanced Powder Technology     Hybrid Journal   (Followers: 16)
Advances in Applied Ceramics     Partially Free   (Followers: 3)
Advances in Chemical Engineering     Full-text available via subscription   (Followers: 17)
Advances in Chemical Engineering and Science     Open Access   (Followers: 24)
Advances in Polymer Technology     Hybrid Journal   (Followers: 11)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 5)
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: 10)
Anti-Corrosion Methods and Materials     Hybrid Journal   (Followers: 4)
Applied Petrochemical Research     Open Access   (Followers: 3)
Asia-Pacific Journal of Chemical Engineering     Hybrid Journal   (Followers: 6)
Biochemical Engineering Journal     Hybrid Journal   (Followers: 9)
Biofuel Research Journal     Open Access   (Followers: 3)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 7)
Brazilian Journal of Chemical Engineering     Open Access   (Followers: 3)
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 2)
Carbohydrate Polymers     Hybrid Journal   (Followers: 9)
Catalysts     Open Access   (Followers: 8)
Chemical and Engineering News     Free   (Followers: 8)
Chemical and Materials Engineering     Open Access   (Followers: 1)
Chemical and Petroleum Engineering     Hybrid Journal   (Followers: 11)
Chemical and Process Engineering     Open Access   (Followers: 4)
Chemical and Process Engineering Research     Open Access   (Followers: 6)
Chemical Communications     Full-text available via subscription   (Followers: 34)
Chemical Engineering & Technology     Hybrid Journal   (Followers: 25)
Chemical Engineering and Processing: Process Intensification     Hybrid Journal   (Followers: 10)
Chemical Engineering and Science     Open Access   (Followers: 3)
Chemical Engineering Communications     Hybrid Journal   (Followers: 11)
Chemical Engineering Journal     Hybrid Journal   (Followers: 24)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 19)
Chemical Engineering Research Bulletin     Open Access   (Followers: 1)
Chemical Engineering Science     Hybrid Journal   (Followers: 17)
Chemical Geology     Hybrid Journal   (Followers: 10)
Chemical Papers     Hybrid Journal   (Followers: 3)
Chemical Product and Process Modeling     Hybrid Journal   (Followers: 3)
Chemical Reviews     Full-text available via subscription   (Followers: 175)
Chemical Society Reviews     Full-text available via subscription   (Followers: 36)
Chemical Technology     Open Access   (Followers: 5)
ChemInform     Hybrid Journal   (Followers: 3)
Chemistry & Industry     Hybrid Journal   (Followers: 2)
Chemistry Central Journal     Open Access   (Followers: 5)
Chemistry of Materials     Full-text available via subscription   (Followers: 155)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 7)
ChemSusChem     Hybrid Journal   (Followers: 8)
Chinese Chemical Letters     Full-text available via subscription   (Followers: 2)
Chinese Journal of Chemical Engineering     Full-text available via subscription   (Followers: 3)
Chinese Journal of Chemical Physics     Hybrid Journal   (Followers: 2)
Coke and Chemistry     Hybrid Journal  
Coloration Technology     Hybrid Journal   (Followers: 1)
Computational Biology and Chemistry     Hybrid Journal   (Followers: 8)
Computer Aided Chemical Engineering     Full-text available via subscription   (Followers: 2)
Computers & Chemical Engineering     Hybrid Journal   (Followers: 8)
CORROSION     Full-text available via subscription   (Followers: 3)
Corrosion Engineering, Science and Technology     Hybrid Journal   (Followers: 22)
Corrosion Reviews     Hybrid Journal   (Followers: 4)
Crystal Research and Technology     Hybrid Journal   (Followers: 2)
Current Opinion in Chemical Engineering     Open Access   (Followers: 3)
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: 43)
Fibers and Polymers     Full-text available via subscription   (Followers: 3)
Fluorescent Materials     Open Access  
Focusing on Modern Food Industry     Open Access   (Followers: 3)
Frontiers of Chemical Science and Engineering     Hybrid Journal   (Followers: 1)
Gels     Open Access  
Geochemistry International     Hybrid Journal  
Handbook of Powder Technology     Full-text available via subscription   (Followers: 3)
Heat Exchangers     Open Access   (Followers: 1)
High Performance Polymers     Hybrid Journal  
Indian Chemical Engineer     Hybrid Journal   (Followers: 3)
Indian Journal of Chemical Technology (IJCT)     Open Access   (Followers: 11)
Industrial & Engineering Chemistry     Full-text available via subscription   (Followers: 9)
Industrial & Engineering Chemistry Research     Full-text available via subscription   (Followers: 19)
Industrial Chemistry Library     Full-text available via subscription   (Followers: 5)
Info Chimie Magazine     Full-text available via subscription   (Followers: 2)
International Journal of Chemical and Petroleum Sciences     Open Access   (Followers: 1)
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: 4)
International Journal of Chemoinformatics and Chemical Engineering     Full-text available via subscription   (Followers: 2)
International Journal of Food Science     Open Access   (Followers: 4)
International Journal of Industrial Chemistry     Open Access  
International Journal of Polymeric Materials     Hybrid Journal   (Followers: 3)
International Journal of Science and Engineering     Open Access   (Followers: 7)
International Journal of Waste Resources     Open Access   (Followers: 5)
Journal of Chemical Engineering & Process Technology     Open Access   (Followers: 3)
Journal of Applied Crystallography     Hybrid Journal   (Followers: 5)
Journal of Applied Electrochemistry     Hybrid Journal   (Followers: 11)
Journal of Applied Polymer Science     Hybrid Journal   (Followers: 135)
Journal of Biomaterials Science, Polymer Edition     Hybrid Journal   (Followers: 8)
Journal of Bioprocess Engineering and Biorefinery     Full-text available via subscription  
Journal of Chemical & Engineering Data     Full-text available via subscription   (Followers: 11)
Journal of Chemical and Biological Interfaces     Full-text available via subscription  

        1 2     

Journal Cover   Geochemistry International
  [SJR: 0.491]   [H-I: 14]   [0 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  [2280 journals]
  • Transformation of organic matter in the Holocene sediments of Lake Ochki
           (south Baikal region): Evidence from pyrolysis data
    • Abstract: Abstract Transformation of organic matter (OM) in Holocene sediments of Lake Ochki (southern coast of Lake Baikal) at the early stages of diagenesis has been studied using pyrolytic methods of Rock Eval (RE-pyrolysis) and pyrolysis-gas chromatography-mass spectrometry (Pyr-GC-MS). OM has been analyzed in lacustrine sediments and their main producers, phytoplankton and zooplankton. Data on the distribution of hydrocarbon–biomarkers in sediments indicate an uninterrupted influx of terrigenous OM and transformation of OM precipitated by microorganisms. The analysis of molecular composition of pyrolysates makes it possible to assume a sharp change of sedimentation conditions in the upper part of sedimentary sequence (0–60 cm). It is shown that the macromolecular aliphatic kerogen structure begins to form in incoherent sediment at the very early stages of diagenesis.
      PubDate: 2015-10-01
  • Britholite ores of the Sakharjok Zr–Y–REE deposit, Kola
           Peninsula: Geochemistry, mineralogy, and formation stages
    • Abstract: Abstract Britholite ores in the complex Sakharjok Zr–Y–REE deposit (Kola Peninsula) form linear bodies in nepheline syenite and contain britholite-group minerals and zircon as main ore minerals. Geochemical data indicate that the formation of the britholite ores of the Sakharjok Massif was mainly controlled by magmatic differentiation and lateto post-magmatic reworking of the rocks by alkaline and F, CO2-bearing fluids. The elevated content of ore components in magma is caused by its derivation from enriched mantle source. It was established that crystallization of britholite occurred at the late and post-magmatic stages of the massif formation and was assisted by fluids with different physicochemical properties. The widest spread fluorbritholite-(Ce) typical of the trachytoid nepheline syenite crystallized mainly during albitization from highly alkaline, F-rich and CO2-bearing fluids/solutions. Britholite-(Ce) and fluorbritholite-(Y) found in the most recrystallized porphyritic nepheline syenite were formed at the later hydrothermal stage from F-bearing water-rich (metamorphic?) solutions. Fluorcalciobritholite crystallized from high-temperature pegmatite melt/solution at high CO2 activity. Postcrystallization alterations of the britholite-group minerals from the Sakharjok deposit resulted in the formation of altered zones within crystals and rims around them. The composition of overgrowth rims indicates the removal of F, Ce, and La from britholite.
      PubDate: 2015-10-01
  • Solubility of nitrogen, carbon, and hydrogen in FeO–Na 2 O–Al
           2 O 3 –SiO 2 melt and liquid iron alloy: Influence of oxygen
    • Abstract: Abstract Abstract—Reactions of nitrogen, carbon, and hydrogen with FeO–Na2O–Al2O3–SiO2 melts, liquid iron alloys, and graphite were investigated at 4 GPa, 1550°C, and fO2 values 1.5–3.0 orders of magnitude below fO2(IW). A number of features important for the understanding of the formation conditions of volatile nitrogen compounds during melting of the Earth’s early reduced mantle were revealed. The nitrogen content of melt increases with decreasing fO2 from 0.96 wt % at ΔlogfO2(IW) =–1.4 to 4.1 wt % at ΔlogfO2(IW) =–3.0, whereas the hydrogen content of melt is weakly dependent on fO2 and lies within 0.40–0.47 wt %. The carbon content is approximately 0.3–0.5 wt %. The IR and Raman spectroscopy of the glasses indicated that the dissolution of nitrogen, carbon, and hydrogen in silicate liquids is accompanied by the formation of NH3, N2, and CH4 molecules, as well as NH 2 – , NH 2 + , NH 4 + and CH 3 – complexes. Hydrogen is dissolved in melts as OH–, H2O, and H2. The experiments also demonstrated the presence of species with C=O double bonds in the melts. It was found that the solubility of nitrogen in FeO–Na2O–Al2O3–SiO2 melts increases in the presence of carbon owing to the formation of species with C–N bonds in the silicate liquid. One of the most remarkable features of nitrogen, carbon, and hydrogen interaction with FeO–Na2O–Al2O3–SiO2 melts is a significant change in the proportions of N–C–H–O species at fO2 2–3 orders of magnitude below fO2(IW). Under these conditions, a sharp decrease in the contents of NH 4 + , NH 2 + (O–NH2), OH, H2O, and CH4 is accompanied by enrichment in NH 2 – (=Si–NH2) and NH3. As a result, NH3 becomes the dominant nitrogen species in the melt. The investigation revealed high nitrogen solubility in iron alloys at fO2 < fO2(IW). The nitrogen content increases from 2.47 wt % at ΔlogfO2(IW) =–1.4 to 3.63 wt % at ΔlogfO2(IW) =–3.0. The carbon content of N–C–Fe alloys ranges from 2.3 to 3.8 wt % and decreases with decreasing fO2. The siderophile behavior of nitrogen at fO2 < fO2(IW) suggests that part of nitrogen could be dissolved in iron alloys during large-scale melting of the early reduced mantle with subsequent nitrogen burial in the Earth’s metallic core. It was suggested that the self-oxidation of magmas in the Earth’s early mantle with the release of reduced N–C–H–O volatiles could be one of the reasons of extensive nitrogen degassing.
      PubDate: 2015-10-01
  • Prediction of the effects of acid mine drainage on variations in the
           hydrogeochemical environment at sulfide-bearing ore deposits
    • Abstract: Abstract Modeling of interactions in the water–rock–CO2–O2 systems was performed for rocks from different sites within a sulfide-bearing ore deposit A. The physicochemical computer modeling showed that acid mine drainage is controlled by the rates of interaction between the components of the system. The reason for the generation of acid mine drainage is that the dissolution rate of aluminosilicate minerals present in the rocks is lower than the rate of sulfide oxidation. The transition from a low to a high water exchange regime resulted in the burst release of pollutants.
      PubDate: 2015-10-01
  • Provenance of “Svecofennian” zircons in the Belomorian mobile
           belt, Baltic shield, and some geodynamic implications
    • Abstract: Abstract The provenance of Archean and Paleoproterozoic zircons in the eclogites and related rocks from the Belomorian Belt of the Baltic Shield is considered on the basis of criteria for their equilibrium with melt, garnet and fluid. It is shown that the Paleoproterozoic zircon with low Th/U ratios (<0.1) and extremely low HREE and MREE contents does not match criteria for its equilibrium crystallization with garnet. This zircon crystallized from Zrand Hf-rich fluid that was in disequilibrium with previously formed eclogite assemblages, but equilibrated with amphibole and plagioclase, thus indicating amphiboliterather than eclogitefacies conditions. The input of fluid and its long-term (~100 Ma) circulation in the deep levels of the Archean juvenile crust of the Belomorian belt was triggered by the Lapland–Kola orogeny. After its peak, the rocks of the belt experienced very slow uplift at rates an order of magnitude lower than those in the Phanerozoic orogens. It is found that Late Archean zircon population contains metamorphic zircon, which matches criteria for simultaneous crystallization with garnet, and oceanic protolithic zircon, which was in equilibrium with high-Mg basalt/gabbro of the Archean oceanic crust. This indicates a subduction origin of the Archean eclogites of the Belomorian belt.
      PubDate: 2015-10-01
  • Kinetics of gypsum dissolution in water
    • Abstract: Abstract The kinetics of dissolution of different lithological varieties of gypsum was experimentally investigated at 5–25°C and P = 0.1 MPa, and a simple rate model was proposed on the basis of the sum of the rates of forward and backward reactions and proportionality to the activity product of calcium and sulfate ions. The activation energies of the forward reaction correspond to dissolution controlled by surface reaction kinetics. It was shown that the kinetic parameters of gypsum dissolution are invariant to the initial concentrations of NaCl solutions (up to 2 M). It was shown that the surface roughness factor (ξ) depends on the chemical composition of lithological varieties and the average grain size of gypsum and changes during epigenetic processes. The obtained kinetic parameters of gypsum dissolution in water will be used for the calculation of groundwater-driven mass transfer.
      PubDate: 2015-09-01
  • Enthalpy of formation of PtBi and PtBi 2 from elements
    • PubDate: 2015-09-01
  • Thermodynamic modeling of water-rock systems to evaluate their generative
           potential for hydrocarbons
    • Abstract: Abstract The hydrocarbon generative potential of rocks was evaluated by modeling chemical interactions in the systems carbonate rock—seawater, silty sand rock—seawater, argillaceous rock—seawater, basalt—seawater, and granite—seawater at 25, 100, 200, and 300°C and over a pressure range from saturated vapor pressure to the platform thermal gradient. The term seawater is used here to describe the composition of marine solutions at the halite (SW2), epsomite (SW3), and sylvite (SW4) stages of evaporation. The hydrocarbon generative potential of rocks in these systems increases in the order clays > silty sands > carbonates > mafic rocks, while felsic rocks are nongenerative. It was shown that an increase in the rock—water mass ratio (R/W), which can be considered as a proxy for the duration (grade) of metamorphism, led to an increase in the reduction potential (logfH2) and hydrocarbon generative potential of rocks. At R/W → 1, logfH2 for carbonates, clays, and silty sands is equal to −2.74, −2.45, and −2.57 at 100°C; −1.2, −1.1, and −1.0 at 200°C; and −0.5, +0.3, and −1.2 at 300°C, which suggests that at higher temperatures (pressures) clays are more capable of reducing chemical elements in the water—rock system.
      PubDate: 2015-09-01
  • Experimental study of model granite melting in the presence of alkali
           carbonate solutions at 400 MPa
    • PubDate: 2015-09-01
  • Modern problems of geochemical and U-Pb geochronological studies of zircon
           in oceanic rocks
    • Abstract: Abstract We present results of zircon LA-ICP-MS U–Pb, Lu–Hf, and trace-element study in combination with whole-rock Sm-Nd and Rb-Sr isotope data on the magmatic rocks of the Markov Deep and Ashadze hydrothermal field (Mid-Atlantic Ridge). Zircon from three gabbronorite samples in the Markov Deep defined an U–Pb ages between 0.90 ± 0.02 and 2.00 ± 0.05 Ma, with the youngest age found in the deepest sample. Zircons from four samples of gabbros and trondhjemites of the Ashadze Field have identical ages: from 1.04 ± 0.07 to 1.12 ± 0.09 Ma. Plagioclase troctolite from the Markov Deep (sample I-1069/19) contains exotic zircon grains with ages widely ranging from 90 Ma to 3.2 Ga, which is inconsistent with age of the rocks in the Mid-Atlantic Ridge. Several hypotheses are discussed to explain the origin of such exotic grains, in particular, their formation at mantle depths, or reaching these depths with subducted crust, and others. Experimental study of zirconium solubility shows that the mafic and ultramafic melts could be oversaturated with respect to zirconium only at unrealistically high contents, which usually do not occur in the corresponding rocks. Entrapped xenogenic zircon must be dissolved in the mafic and ultramafic melts and its finds in these rocks presumably indicate its disequilibrium precipitation. Zircon could be formed in the intrusive mafic rocks at the final stages of fractional crystallization, which explains the presence of own zircon in gabbroids. Zircon is very stable in crustal magmatic processes, especially at lowered activity of alkalis, but almost instantly (on geological scale) loses radiogenic lead by diffusion way under upper mantle conditions (1300–1500°C). While applying REE distribution for interpreting zircon origin, as many as possible elements should be analyzed to discriminate between intrinsic zircon element distribution and anomalies caused by defects in its structure.
      PubDate: 2015-09-01
  • Chlorine partitioning between melt and aqueous chloride fluid during
           granite magma. Degassing I. Decompression-induced melt degassing
    • Abstract: Abstract Based on available experimental data, a computer model was developed for the description of chlorine distribution between a magmatic melt of metaluminous granite composition and an aqueous chloride fluid phase formed during the decompression degassing of magma at pressures ranging from 5 to 0.5–0.3 kbar and temperatures of 800 ± 25°C. The model accounts for the dependence of fluid/melt Cl partition coefficient on pressure and Cl content of the melt. It allows the calculation of Cl and H2O redistribution between melt and fluid during the decompression degassing of magmas under both closed-system conditions, when fluid remains in the system, and open-system conditions, when the released fluid phase is completely of partly removed from the system. The results of numerical modeling revealed the influence of the initial Cl and H2O contents in melt and the degree of system openness on variations in the concentrations of these volatiles in aqueous fluid and melt during magma ascent toward the surface under near-isothermal conditions. The highest Cl concentrations of the fluid (C Cl fl ) are attained at the early stages of decompression degassing at high pressures. With decreasing pressure, C Cl fl decreases at a rate that increases at increasing degree of system openness. During open-system degassing, the Cl content of melt (C Cl m ) also decreases. In contrast, under closed-system conditions, C Cl m decreases initially with decreasing pressure, reaches a minimum, and then increases. If decompression degassing begins at P ≤ 1.0-1.25 kbar, C Cl m changes only slightly irrespective of the initial Cl content of the melt and the degree of system openness.
      PubDate: 2015-09-01
  • Brines in the western part of the Tunguska artesian basin
    • Abstract: Abstract Geochemistry of brines in the Tunguska artesian basin indicates that these brines were in equilibrium with carbonate, sulfate, and secondary aluminosilicate minerals but not with primary aluminosilicates. Salinity of brines saturated with halite is greater than 360 g/dm{sn3}. Analysis of the Ca/Cl, Sr/Cl, and Br/Cl ratios of the brines testifies that an increase in the salinity of the brines and variations in their composition result from metamorphism in the water–rock system. The principal Ca and Sr sources of the brines are sulfates (anhydrite, gypsum, and celestine), which are dissolved because of reduction of the sulfate ion and its removal from the system: CaSO4 + 2Corg + MgCl2 + 2H2O = MgCa(CO3)2 + H2S + 2HCl. Another process forming the chemical composition of the brines is interaction with primary (Ca, Mg) aluminosilicates according to the reaction: CaAl2Si2O8 + 3H2O + 2CO2 = Al2Si2O5(OH)4 + Ca{sn2+} + 2HCO − 3 .The principal source of Br for the brines is seawater.
      PubDate: 2015-08-01
  • Geochemical evidence of an oceanic provenance of cherts in accretionary
           complexes in the Sikhote Alin
    • Abstract: Abstract The paper reports pioneering data on the distribution of REE in cherts in the Taukha terrane of the Late Jurassic–Early Cretaceous accretionary prism in the Sikhote Alin and a calculated value of the Ce anomaly. The values of the Ce anomaly, the ratios of certain major components, and the ratios of these components and REE are used to estimate the facies environments in which the cherty material was accumulated. This material is proved to have started accumulating within a zone adjacent to the spreading ridge and continued on the abyssal plane. The uppermost portion of the vertical section, which is made up of siliceous mudstone, was deposited in the marginal part of the paleoocean adjacent to the continental marginal sedimentation region. The sedimentation environments systematically alternating in a single geologic section suggest that the part of the seafloor on which the cherty sediments were accumulated moved from the spreading cen-ter to the margin of the paleocontinent, and this caused the drift of the stratigraphic section across various oceanic facies zones.
      PubDate: 2015-08-01
  • Equilibrium of nitrogen-rich spring waters of the Baikal Rift Zone with
           host rock minerals as a basis for determining mechanisms of their
    • Abstract: Abstract This paper presents calculations of equilibria between nitrogenrich hot springs of the Baikal Rift Zone (BRZ) and a secondary mineral assemblage (carbonate, fluoride, clay, zeolite, and other minerals). The results confirm the equilibrium–nonequilibrium character of the nitrogen spring water–rock system. Unlike other water types, the system evolves under conditions of continuous incorporation of chemical elements released from the host minerals into the newly formed secondary minerals. This allows the system to remain dynamically stable with no increase in salinity, despite continued water–rock interaction. The main factor responsible for this state of the system is a deficiency of acids, i.e., high pH. As a result, the disturbance of relationships between concentrations of aqueous species compared to the starting composition of dissolved solids produces a deficiency of some elements (Ca, Mg, Fe, Al, etc.) and an excess of other elements (Na, Si, F, etc.).
      PubDate: 2015-08-01
  • Distribution of 137 Cs, 90 Sr, and plutonium isotopes in grounds at the
           peaceful nuclear explosion site
    • PubDate: 2015-08-01
  • Evidence of Middle Neoproterozoic extensional tectonic settings along the
           western margin of the Siberian craton: Implications for the breakup of
    • Abstract: Abstract The new results of U–Pb and 40Ar/39Ar dating and petrological and geochemical studies of rocks from the Yenisey regional shear zone (YRSZ) in the Transangarian part of the Yenisey Ridge were used to identify a dike belt at the western margin of the Siberian craton and constrain the timing of formation of rift-related structures accompanied by within-plate magmatism. The magmatism of this epoch produced felsic and mafic intrusive rocks. The extension processes are recorded by the 797–787 Ma dike swarms. The rift origin of the rocks studied here is confirmed by their occurrence as dikes and sills confined to the YRSZ, bimodal composition of magmatic rock associations, and petrochemical characteristics of rocks typical of within-plate settings. The formation of the 800 Ma dike belt within the study area could be associated with the Neoproterozoic extensional tectonic events along the western margin of the Siberian craton which coincided with the onset of the breakup of the Rodinia supercontinent. These events provide the upper age limit for the collisional metamorphism that took place at the final stage of orogeny. The evolutionary phases identified in the region agree well with the sequence and style of tectonothermal events within the Valhalla Orogen at the Arctic margin of Rodinia and provide further support for the spatial proximity between Siberia and North Atlantic cratons during this epoch, as indicated by recent paleomagnetic data.
      PubDate: 2015-08-01
  • Enthalpy of formation of palladium bismuthides PdBi and PdBi 2 from
    • PubDate: 2015-08-01
  • Study of complex molecular species in the gas phase over the
           CaO–MgO–Al 2 O 3 –TiO 2 –SiO 2 system
    • Abstract: Abstract Experimental mass spectrometric data obtained by the Knudsen effusion mass spectrometry are used to analyze principal tendencies in the formation of complex oxides contained in the gas phase over compounds and melts in the CaO–MgO–Al2O3–TiO2–SiO2 system. Dependences are derived for concentrations of the complex molecular species in the gas phase at the vaporization of mullite Al6Si2O13, wollastonite CaSiO3, spinel MgAl2O4, perovskite CaTiO3, and the Al2O3–SiO2 and CaO–SiO2 binary boundary systems on temperature, melt composition, and oxygen partial pressure.
      PubDate: 2015-08-01
  • Organic carbon in the Razdol’naya River Estuary (Amur Bay, Sea of
           Japan) during the period of ice cover
    • Abstract: Abstract The paper presents data on organic carbon concentrations in riverine suspended matter and surficial bottom sediments measured in the estuary of the Razdol’naya River during the period of ice cover (February 2010). In the suspended matter, humic substances and phytoplankton accounted for 30% and 14% of total organic carbon, respectively. The concentration of humic substances in riverine suspended matter was determined for the first time by spectrophotometry. The concentration of phytoplankton carbon was calculated from the chlorophyll-a content. Concentrations of organic carbon, humic substances, and chlorophyll-a were measured in the surface sediment layer. The proportions of these three components show no marked variability with an increase in salinity to 23‰. The degree of humification in bottom sediments was about 52%. Organic carbon concentrations were almost an order of magnitude lower and the proportion of bioavailable (nonhumified) carbon was two times lower in the bottom sediments than in the riverine suspended matter.
      PubDate: 2015-08-01
  • Results of experimental determination of the intrinsic oxygen fugacity of
           Ru-Os-Ir alloys from the Verkh-Neivinsky Dunite-Harzburgite Massif, Middle
           Urals, Russia
    • PubDate: 2015-07-01
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