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  Subjects -> ENGINEERING (Total: 2277 journals)
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CHEMICAL ENGINEERING (191 journals)                     

Showing 1 - 192 of 192 Journals sorted alphabetically
AATCC Journal of Research     Full-text available via subscription   (Followers: 7)
ACS Sustainable Chemistry & Engineering     Hybrid Journal   (Followers: 5)
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: 21)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 8)
Advanced Chemical Engineering Research     Open Access   (Followers: 32)
Advanced Powder Technology     Hybrid Journal   (Followers: 17)
Advances in Applied Ceramics     Hybrid Journal   (Followers: 5)
Advances in Chemical Engineering     Full-text available via subscription   (Followers: 27)
Advances in Chemical Engineering and Science     Open Access   (Followers: 56)
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: 11)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 12)
Anti-Corrosion Methods and Materials     Hybrid Journal   (Followers: 10)
Applied Petrochemical Research     Open Access   (Followers: 2)
Asia-Pacific Journal of Chemical Engineering     Hybrid Journal   (Followers: 8)
Biochemical Engineering Journal     Hybrid Journal   (Followers: 15)
Biofuel Research Journal     Open Access   (Followers: 4)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 10)
Brazilian Journal of Chemical Engineering     Open Access   (Followers: 3)
Bulletin of Chemical Reaction Engineering & Catalysis     Open Access   (Followers: 2)
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 2)
Carbohydrate Polymers     Hybrid Journal   (Followers: 8)
Catalysts     Open Access   (Followers: 8)
ChemBioEng Reviews     Full-text available via subscription   (Followers: 1)
Chemical and Engineering News     Free   (Followers: 15)
Chemical and Materials Engineering     Open Access   (Followers: 13)
Chemical and Petroleum Engineering     Hybrid Journal   (Followers: 13)
Chemical and Process Engineering     Open Access   (Followers: 28)
Chemical and Process Engineering Research     Open Access   (Followers: 24)
Chemical Engineering & Technology     Hybrid Journal   (Followers: 32)
Chemical Engineering and Processing: Process Intensification     Hybrid Journal   (Followers: 17)
Chemical Engineering and Science     Open Access   (Followers: 19)
Chemical Engineering Communications     Hybrid Journal   (Followers: 14)
Chemical Engineering Education     Full-text available via subscription  
Chemical Engineering Journal     Hybrid Journal   (Followers: 46)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 25)
Chemical Engineering Research Bulletin     Open Access   (Followers: 12)
Chemical Engineering Science     Hybrid Journal   (Followers: 28)
Chemical Geology     Hybrid Journal   (Followers: 22)
Chemical Papers     Hybrid Journal   (Followers: 2)
Chemical Product and Process Modeling     Hybrid Journal   (Followers: 4)
Chemical Reviews     Full-text available via subscription   (Followers: 179)
Chemical Society Reviews     Full-text available via subscription   (Followers: 42)
Chemical Technology     Open Access   (Followers: 16)
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: 228)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 15)
ChemSusChem     Hybrid Journal   (Followers: 7)
Chinese Chemical Letters     Full-text available via subscription   (Followers: 2)
Chinese Journal of Chemical Engineering     Full-text available via subscription   (Followers: 4)
Chinese Journal of Chemical Physics     Hybrid Journal   (Followers: 1)
Coke and Chemistry     Hybrid Journal   (Followers: 1)
Coloration Technology     Hybrid Journal   (Followers: 1)
Computational Biology and Chemistry     Hybrid Journal   (Followers: 12)
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: 21)
Corrosion Engineering, Science and Technology     Hybrid Journal   (Followers: 37)
Corrosion Reviews     Hybrid Journal   (Followers: 6)
Crystal Research and Technology     Hybrid Journal   (Followers: 6)
Current Opinion in Chemical Engineering     Open Access   (Followers: 7)
Designed Monomers and Polymers     Open Access   (Followers: 2)
Education for Chemical Engineers     Hybrid Journal   (Followers: 5)
Eksergi     Open Access  
European Polymer Journal     Hybrid Journal   (Followers: 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)
Food and Environment Safety     Open Access  
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: 12)
Industrial & Engineering Chemistry Research     Full-text available via subscription   (Followers: 23)
Industrial Chemistry Library     Full-text available via subscription   (Followers: 3)
Industrial Gases     Open Access  
Info Chimie Magazine     Full-text available via subscription   (Followers: 3)
International Journal of Chemical Engineering     Open Access   (Followers: 7)
International Journal of Chemical Reactor Engineering     Hybrid Journal   (Followers: 3)
International Journal of Chemical Technology     Open Access   (Followers: 5)
International Journal of Chemoinformatics and Chemical Engineering     Full-text available via subscription   (Followers: 2)
International Journal of Food Science     Open Access   (Followers: 3)
International Journal of Industrial Chemistry     Open Access   (Followers: 1)
International Journal of Polymeric Materials     Hybrid Journal   (Followers: 6)
International Journal of Waste Resources     Open Access   (Followers: 4)
Journal of Chemical Engineering & Process Technology     Open Access   (Followers: 5)
Journal of Applied Crystallography     Hybrid Journal   (Followers: 6)
Journal of Applied Electrochemistry     Hybrid Journal   (Followers: 14)
Journal of Applied Polymer Science     Hybrid Journal   (Followers: 135)
Journal of Applied Science & Process Engineering     Open Access  
Journal of Biomaterials Science, Polymer Edition     Hybrid Journal   (Followers: 9)
Journal of Bioprocess Engineering and Biorefinery     Full-text available via subscription  
Journal of Chemical & Engineering Data     Full-text available via subscription   (Followers: 12)
Journal of Chemical and Biological Interfaces     Full-text available via subscription   (Followers: 1)
Journal of Chemical Ecology     Hybrid Journal   (Followers: 7)
Journal of Chemical Engineering     Open Access   (Followers: 20)
Journal of Chemical Engineering and Materials Science     Open Access   (Followers: 2)
Journal of Chemical Science and Technology     Open Access   (Followers: 5)
Journal of Chemical Sciences     Partially Free   (Followers: 22)
Journal of Chemical Technology & Biotechnology     Hybrid Journal   (Followers: 10)
Journal of Chemical Theory and Computation     Full-text available via subscription   (Followers: 17)
Journal of CO2 Utilization     Hybrid Journal   (Followers: 2)
Journal of Combinatorial Chemistry     Full-text available via subscription   (Followers: 1)
Journal of Crystallization Process and Technology     Open Access   (Followers: 8)
Journal of Environmental Chemical Engineering     Hybrid Journal   (Followers: 7)
Journal of Food Measurement and Characterization     Hybrid Journal  
Journal of Food Processing & Technology     Open Access   (Followers: 1)
Journal of Fuel Chemistry and Technology     Full-text available via subscription   (Followers: 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 Materials Science and Chemical Engineering     Open Access  
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: 6)
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: 6)
Journal of Polymers and the Environment     Hybrid Journal   (Followers: 1)
Journal of Pure and Applied Chemistry Research     Open Access   (Followers: 2)
Journal of the American Chemical Society     Full-text available via subscription   (Followers: 319)
Journal of the Bangladesh Chemical Society     Open Access  
Journal of the Brazilian Chemical Society     Open Access   (Followers: 2)
Journal of The Institution of Engineers (India) : Series E     Hybrid Journal   (Followers: 2)
Journal of the Taiwan Institute of Chemical Engineers     Hybrid Journal   (Followers: 2)
Journal of Water Chemistry and Technology     Hybrid Journal   (Followers: 9)
Jurnal Bahan Alam Terbarukan     Open Access  
Jurnal Inovasi Pendidikan Kimia     Open Access   (Followers: 5)
Jurnal Reaktor     Open Access  
Jurnal Rekayasa Kimia & Lingkungan     Open Access  
Jurnal Teknologi Dan Industri Pangan     Open Access   (Followers: 1)
Konversi     Open Access  
Korean Journal of Chemical Engineering     Hybrid Journal   (Followers: 3)
Main Group Metal Chemistry     Hybrid Journal   (Followers: 2)
Materials Chemistry and Physics     Full-text available via subscription   (Followers: 16)
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  
Nanochemistry Research     Open Access  
Nanocontainers     Open Access   (Followers: 1)
Nanofabrication     Open Access  
Noise Control Engineering Journal     Full-text available via subscription   (Followers: 4)
Ochrona Srodowiska i Zasobów Naturalnych : Environmental Protection and Natural Resources     Open Access  
Petroleum Chemistry     Hybrid Journal   (Followers: 1)
Physics and Chemistry of Glasses - European Journal of Glass Science and Technology Part B     Full-text available via subscription   (Followers: 4)
Plasma Processes and Polymers     Hybrid Journal   (Followers: 3)
Plasmas and Polymers     Hybrid Journal  
Polymer     Hybrid Journal   (Followers: 162)
Polymer Bulletin     Hybrid Journal   (Followers: 7)
Polymer Composites     Hybrid Journal   (Followers: 16)
Polyolefins Journal     Open Access  
Powder Metallurgy Progress     Unknown   (Followers: 1)
Powder Technology     Hybrid Journal   (Followers: 13)
Recyclable Catalysis     Open Access   (Followers: 1)
Research on Chemical Intermediates     Hybrid Journal  
Reviews in Chemical Engineering     Hybrid Journal   (Followers: 5)
Revista ION     Open Access  
Revista Mexicana de Ingeniería Química     Open Access  
Rubber Chemistry and Technology     Full-text available via subscription   (Followers: 2)
Russian Chemical Bulletin     Hybrid Journal   (Followers: 2)
Russian Journal of Applied Chemistry     Hybrid Journal   (Followers: 1)
Science and Engineering of Composite Materials     Hybrid Journal   (Followers: 61)
Solid Fuel Chemistry     Hybrid Journal  
South African Journal of Chemical Engineering     Open Access   (Followers: 2)
South African Journal of Chemistry     Open Access   (Followers: 2)
Surface Engineering and Applied Electrochemistry     Hybrid Journal   (Followers: 6)
Sustainable Chemical Processes     Open Access   (Followers: 2)
Synthesis Lectures on Chemical Engineering and Biochemical Engineering     Full-text available via subscription  
The Canadian Journal of Chemical Engineering     Hybrid Journal   (Followers: 4)
The Chemical Record     Hybrid Journal   (Followers: 1)
Theoretical Foundations of Chemical Engineering     Hybrid Journal   (Followers: 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  [2354 journals]
  • Molecular and structural-group characteristics of hydrocarbons in Late
           Devonian oils of the Timan–Pechora Province
    • Authors: D. A. Bushnev; M. B. Smirnov; N. S. Burdel’naya; O. V. Valyaeva
      Pages: 802 - 813
      Abstract: The paper presents gaz chromatography–mass spectrometry and 1H- and 13C-NMR data on the composition of hydrocarbon markers and structural-group composition of oils in the Timan–Pechora oil and gas province. The set of samples is subdivided into groups whose oils differ in composition and the distribution of their polycyclic biomarkers. All of the oils show closely similar geochemical characteristics, types of their source organic matter, and thermal maturity. Comparison of oil characteristics (composition of the polycyclic biomarkers) and parameters determined by chromatography–mass spectrometry makes it possible to reveal certain important (and calling for further investigation) relations between the composition of the structural groups of hydrocarbons in the oil fluid and its geochemical characteristics.
      PubDate: 2017-09-01
      DOI: 10.1134/s001670291708002x
      Issue No: Vol. 55, No. 9 (2017)
       
  • Thermodynamic study of calcic amphiboles
    • Authors: L. P. Ogorodova; I. A. Kiseleva; M. F. Vigasina; L. V. Mel’chakova; I. A. Bryzgalov; D. A. Ksenofontov
      Pages: 814 - 821
      Abstract: The paper reports original thermochemical data on six natural amphibole samples of different composition. The data were obtained by high-temperature melt solution calorimetry in a Tian–Calvet microcalorometer and include the enthalpies of formation from elements for actinolite Ca1.95(Mg4.4Fe 0.5 2+ Al01)[Si8.0O22](OH)2(–12024 ± 13 kJ/mol) and Ca2.0(Mg2.9Fe 1.9 2+ Fe 0.2 3+ )[Si7.8Al0.2O22](OH)2, (–11462 ± 18 kJ/mol), and Na0.1Ca2.0(Mg3.2Fe 1.6 2+ Fe 0.2 3+ )[Si7.7Al0.3O22](OH)2 (–11588 ± 14 kJ/mol); for pargasite Na0.5K0.5Ca2.0-(Mg3.4Fe 1.8 2+ Al0.8)[Si6.2Al1.8O22](OH)2 (–12316 ± 10 kJ/mol) and Na0.8K0.2Ca2.0(Mg2.8Fe 1.3 3+ Al0.9) [Si6.1Al1.9O22](OH)2 (–12 223 ± 9 kJ/mol); and for hastingsite Na0.3K0.2Ca2.0(Mg0.4Fe 1.3 2+ Fe 0.9 3+ Al0.2) [Si6.4Al1.6O22](OH)2 (‒10909 ± 11 kJ/mol). The standard entropy, enthalpy, and Gibbs free energy of formation are estimated for amphiboles of theoretical composition: end members and intermediate members of the isomorphic series tremolite–ferroactinolite, edenite–ferroedenite, pargasite–ferropargasite, and hastingsite.
      PubDate: 2017-09-01
      DOI: 10.1134/s0016702917080067
      Issue No: Vol. 55, No. 9 (2017)
       
  • Crystallization temperature of anatectic melt: An example of
           biotite–muscovite granite in the Rikolatvi structure, Belomorian Mobile
           Belt
    • Authors: T. F. Shcherbakova
      Pages: 833 - 839
      Abstract: Zircon hosted in granite, which crystallized from local pools of anatectic melt among migmatites, in the Rikolatvi structure, Belomorian Mobile Belt, contains minute inclusions of various minerals, biotite and garnet among others. The compositions of the biotite and garnet in the microinclusions differ from those of the same minerals in the granite containing the zircon. The crystallization temperature of the anatectic melt was estimated by the biotite–garnet geothermometer and the composition of the biotite and garnet inclusions at ~800°C.
      PubDate: 2017-09-01
      DOI: 10.1134/s0016702917080080
      Issue No: Vol. 55, No. 9 (2017)
       
  • Origin of isotopically light nitrogen in meteorites
    • Authors: A. B. Verchovsky
      Pages: 957 - 970
      Abstract: Bulk meteorite samples of various chemical classes and petrologic types (mainly carbonaceous chondrites) were systematically investigated by the stepped combustion method with the simultaneous isotopic analysis of carbon, nitrogen, and noble gases. A correlation was revealed between planetary noble gases associating with the Q phase and isotopically light nitrogen (δ15N up to –150‰). The analysis of this correlation showed that the isotopically light nitrogen (ILN) is carried by Q. In most meteorites, isotopically heavy nitrogen (IHN) of organic compounds (macromolecular material) is dominant. The ILN of presolar grains (diamond and SiC) and Q can be detected after separation from dominant IHN. Such a separation of nitrogen from Q and macromolecular material occurs under natural conditions and during laboratory stepped combustion owing to Q shielding from direct contact with oxygen, which results in Q oxidation at temperatures higher than the temperatures of the release of most IHN. There are arguments that ILN released at high temperature cannot be related to nanodiamond and SiC. The separation effect allowed us to constrain the contents of noble gases in Q, assuming that this phase is carbon-dominated. The directly measured 36Ar/C and 132Xe/C ratios in ILN-rich temperature fractions are up to 0.1 and 1 × 10–4 cm3/g, respectively. These are only lower constraints on the contents. The analysis of the obtained data on the three-isotope diagram δ15N–36Ar/14N showed that Q noble gases were lost to a large extent from most meteorites during the metamorphism of their parent bodies. Hence, the initial contents of noble gases in Q could be more than an order of magnitude higher than those directly measured. Compared with other carbon phases, Q was predominantly transformed to diamond in ureilites affected by shock metamorphism. The analysis of their Ar–N systematics showed that, similar to carbonaceous chondrites, noble gases were lost from Q probably before its transformation to diamond.
      PubDate: 2017-11-01
      DOI: 10.1134/s0016702917110106
      Issue No: Vol. 55, No. 11 (2017)
       
  • Trapped extraterrestrial argon in meteorites
    • Authors: E. V. Korochantseva; A. I. Buikin; M. Trieloff
      Pages: 971 - 976
      Abstract: The article considers different points of view on the genesis of extraterrestrial trapped argon with a composition different from primordial/solar in meteorites and lunar rocks. An alternative hypothesis of the origin of this component is discussed.
      PubDate: 2017-11-01
      DOI: 10.1134/s0016702917110064
      Issue No: Vol. 55, No. 11 (2017)
       
  • He, Ne, Ar stepwise crushing data on basalt glasses from different
           segments of Bouvet Triple Junction
    • Authors: A. I. Buikin; N. A. Migdisova; J. Hopp; E. V. Korochantseva; M. Trieloff
      Pages: 977 - 987
      Abstract: Here we present the first data on He, Ne, Ar isotopic and elemental composition in fluid phases of tholeiitic chilled glasses from the Bouvet Triple Junction (BTJ). The chilled glasses from several dredging stations situated at different segments of BTJ have been investigated: Spiess Ridge, Mid Atlantic Ridge (MAR) and in a valley of the Southwest Indian Ridge (SWIR). The data allow to distinguish within BTJ three segments characterized by different geochemical behavior of He, Ne and Ar. MAR and Spiess samples contain MORB-like helium and neon while SWIR is characterized by addition of plume type He and Ne. The strong atmospheric contamination is typical of all segments, but for MAR it is less pronounced. The Ne-Ar isotope systematics suggests that the atmospheric component was most probably introduced into the mantle source of the fluids with fragments of oceanic crust/sediments.
      PubDate: 2017-11-01
      DOI: 10.1134/s0016702917110039
      Issue No: Vol. 55, No. 11 (2017)
       
  • Evidence for large scale fractionation of carbon isotopes and of nitrogen
           impurity during crystallization of gem quality cubic diamonds from placers
           of North Yakutia
    • Authors: V. N. Reutsky; A. A. Shiryaev; S. V. Titkov; M. Wiedenbeck; N. N. Zudina
      Pages: 988 - 999
      Abstract: The spatial distribution of carbon and nitrogen isotopes and of nitrogen concentrations is studied in detail in three gem quality cubic diamonds of variety II according to Orlov’s classification. Combined with the data on composition of fluid inclusions our results point to the crystallization of the diamonds from a presumably oxidized carbonate fluid. It is shown that in the growth direction δ13C of the diamond becomes systematically lighter by 2–3‰ (from –13.7 to –15.6‰ for one profile and from –11.7 to –14.1‰ for a second profile). Simultaneously, we observe substantial decrease in the nitrogen concentration (from 400–1000 to 10–30 at ppm) and a previously unrecognized enrichment of nitrogen in light isotope, exceeding 30‰. The systematic and substantial changes of the chemical and isotopic composition can be explained using the Burton-Prim-Slichter model, which relates partition coefficients of an impurity with the crystal growth rate. It is shown that changes in effective partition coefficients due to a gradual decrease in crystal growth rate describes fairly well the observed scale of the chemical and isotopic variations if the diamond-fluid partition coefficient for nitrogen is significantly smaller than unity. This model shows that nitrogen isotopic composition in diamond may result from isotopic fractionation during growth and not reflect isotopic composition of the mantle fluid. Furthermore, it is shown that the infra-red absorption at 1332 сm-1 is an integral part of the Y-defect spectrum. In the studied natural diamonds the 1290 сm-1 IR absorption band does not correlate with boron concentration.
      PubDate: 2017-11-01
      DOI: 10.1134/s001670291711009x
      Issue No: Vol. 55, No. 11 (2017)
       
  • Origin of corundum rocks of the Belomorian mobile belt: Evidence from
           noble gas isotope geochemistry
    • Authors: E. Yu. Akimova; E. N. Kozlov; K. I. Lokhov
      Pages: 1000 - 1009
      Abstract: The noble gas isotopic composition is studied in gas-liquid microinclusions from minerals of the corundum-bearing and host rocks of the Khitoostrov occurrence, North Karelia. It was established for the first time that fluid participating in the formation of rocks with anomalous oxygen isotopic composition is devoid of an atmospheric component, while helium and neon show significant fractionation relative to argon. The formation of rocks with extremely light oxygen isotope composition was related to the effect of endogenous fluid.
      PubDate: 2017-11-01
      DOI: 10.1134/s0016702917110027
      Issue No: Vol. 55, No. 11 (2017)
       
  • Pb–Pb isotopic systematics of orogenic gold deposits of the
           Baikal–Patom fold belt (Northern Transbaikalia, Russia) and estimation
           of the role of neoproterozoic crust in their formation
    • Authors: A. V. Chugaev; I. V. Chernyshev
      Pages: 1010 - 1021
      Abstract: The paper reports the results of Pb isotope study of several gold deposits of the Russia’s largest metallogenic province of Northern Transbaikalia. Potential sources of the ore material are considered by the example of new and previously published Pb–Pb data on nine deposits and occurrences of different scales. The comparison of Pb–Pb isotope-geochemical characteristics of ores, Paleozoic granitoids, as well as metamorphic pyrite from barren metasedimentary sequences shows that the Neoproterozoic terrigenous–carbonate rocks of the Baikal–Patom fold belt (BPB) served as the main source of lead and other components in the mineral-forming systems of the deposits. Significant variations of Pb isotope ratios typical in general of the considered deposits of the BPB reflect the initial isotopic heterogeneity of Pb source. This heterogeneity is caused by mixing of two geochemical types of continental crust during sedimentation: old (Early Precambrian) crust of the Siberian craton with long-term geochemical evolution and newly formed Late Precambrian crust. Pb–Pb data serve in support of the hydrothermal–metamorphogenic hypothesis of the formation of gold deposits of the BPB.
      PubDate: 2017-11-01
      DOI: 10.1134/s0016702917110040
      Issue No: Vol. 55, No. 11 (2017)
       
  • Isotope (δD, δ 18 О) systematics in waters of the Russian
           Arctic seas
    • Authors: E. O. Dubinina; S. A. Kossova; A. Yu. Miroshnikov; N. M. Kokryatskaya
      Pages: 1022 - 1032
      Abstract: Oxygen and hydrogen isotope analysis was performed to study the processes of distribution of water masses and modification of their salinity in the Russian Arctic seas. A wealth of new isotopic data was obtained for freshwater (river runoff, Novaya Zemlya glaciers) and seawater samples collected along a set of extended 2D profiles in the Barents, Kara, and Laptev Seas. The study presents the first δD values measured for the Northeast Atlantic Deep Water NEADW dominated the water column of the Barents Sea (S = 34.90 ± 0.05, δD = +1.55 ± 0.4‰, δ18O = +0.26 ± 0.1‰, n = 44). This water mass is present in the Kara Sea and western Laptev Sea. The relationship between δD, δ18О, and salinity data was used to calculate the fractions of waters of different origin, including the fractions of continental runoff in waters of the Barents, Kara, and Laptev Seas. It was shown that the relationships between the isotopic parameters (δD, δ18О) and salinity in waters of the Kara and Laptev Seas is controlled by the intensity of continental runoff and sea ice processes. Sea ice formation is the main factor controlling the formation of the water column on the Laptev Sea shelf, whereas the surface waters of the middle Kara Sea are dominated by the contribution of river runoff. A very strong stratification in the Kara Sea is caused by the presence of a relatively fresh surface layer mostly contributed by estuarine water inputs from the Ob and Yenisei Rivers. The contribution of river waters reaches 40–60% in the surface layer in the central part of the sea and decreases to a few percent down 100 m water depth. Stratification in the western part of the Laptev Sea is controlled by the contribution of freshwater input from the Lena River and modification of salinity by sea ice formation.
      PubDate: 2017-11-01
      DOI: 10.1134/s0016702917110052
      Issue No: Vol. 55, No. 11 (2017)
       
  • Geochemistry of О, Н, C, S, and Sr isotopes in the water and
           sediments of the Aral basin
    • Authors: B. G. Pokrovsky; P. O. Zaviyalov; M. I. Bujakaite; A. S. Izhitskiy; O. L. Petrov; A. K. Kurbaniyazov; V. M. Shimanovich
      Pages: 1033 - 1045
      Abstract: The paper presents original authors' data on the O, H, C, S, and Sr isotopic composition of water and sediments from the basins into which the Aral Sea split after its catastrophic shoaling: Chernyshev Bay (CB), the basin of the Great Aral in the north, Lake Tshchebas (LT), and Minor Sea (MS). The data indicate that the δ18О, δD, δ13C, and δ34S of the water correlate with the mineralization (S) of the basins (as of 2014): for CB, S = 135.6‰, δ18О = 4.8 ± 0.1‰, δD = 5 ± 2‰, δ13C (dissolved inorganic carbon, DIC) = 3.5 ± 0.1‰, δ34S = 14.5‰; for LT, S = 83.8‰, δ18О = 2.0 ± 0.1‰, δD =–13.5 ± 1.5‰, δ13C = 2.0 ± 0.1‰, δ34S = 14.2‰; and for MS, S = 9.2‰, δ18О =–2.0 ± 0.1‰, δD =–29 ± 1‰, δ13C =–0.5 ± 0.5‰, δ34S = 13.1‰. The oxygen and hydrogen isotopic composition of the groundwaters are similar to those in MS and principally different from the artesian waters fed by atmospheric precipitation. The mineralization, δ13С, and δ34S of the groundwaters broadly vary, reflecting interaction with the host rocks. The average δ13С values of the shell and detrital carbonates sampled at the modern dried off zones of the basins are similar: 0.8 ± 0.8‰ for CB, 0.8 ± 1.4‰ for LT, and –0.4 ± 0.3‰ for MS. The oxygen isotopic composition of the carbonates varies much more broadly, and the average values are as follows: 34.2 ± 0.2‰ for CB, 32.0 ± 2.2‰ for LT, and 28.2 ± 0.9‰ for MS. These values correlate with the δ18O of the water of the corresponding basins. The carbonate cement of the Late Eocene sandstone of the Chengan Formation, which makes up the wave-cut terrace at CB, has anomalously low δ13С up to –38.5‰, suggesting origin near a submarine methane seep. The δ34S of the mirabilite and gypsum (11.0 to 16.6‰) from the bottom sediments and young dried off zone also decrease from CB to MS in response to increasing content of sulfates brought by the Syr-Darya River (δ34S = 9.1 to 9.9‰) and weakening sulfate reduction. The 87Sr/86Sr ratio in the water and carbonates of the Aral basins do not differ, within the analytical error, and is 0.70914 ± 0.00003 on average. This value indicate that the dominant Sr source of the Aral Sea is Mesozoic–Cenozoic carbonate rocks. The Rb–Sr systems of the silicate component of the bottom silt (which is likely dominated by eolian sediments) of MS and LT plot on the Т = 160 ± 5 Ma, I 0 = 0.7091 ± 0.0001, pseudochron. The Rb–Sr systems of CB are less ordered, and the silt is likely a mixture of eolian and alluvial sediments.
      PubDate: 2017-11-01
      DOI: 10.1134/s0016702917110076
      Issue No: Vol. 55, No. 11 (2017)
       
  • Evolution of biogeochemical cycles under anthropogenic loads: Limits
           impacts
    • Authors: T. I. Moiseenko
      Pages: 841 - 860
      Abstract: Human activities pathogenically modify biogeochemical cycles via introducing vast amounts of chemical elements and compounds into biotic cycles and inducing evolutionary transformations of the organic world of the biosphere. The adverse phenomena develop cascadewise, as is illustrated by the increase in the content of carbon dioxide and acid-forming compounds, enrichment of aquatic environments by metals, and pollution with persistent organic pollutants and biogenic elements. Analogies with the past are utilized to estimate the possible implications of the evolution of anthropogenically induced processes. The organic world is proved to react to anthropogenic impacts by means of active microevolutionary processes. The key reaction mechanisms of organisms and transformations of populations and ecosystems under the modified conditions are demonstrated. A review of literature data is used to show how anthropogenic emissions of CO2, NOx, P, toxic compounds and elements increases on a global scale, and how ocean acidification, eutrophication, water withdrawal, etc. are simultaneously enhanced. The methodology of estimating anthropogenic loads is discussed as a scientifically grounded strategy of minimizing anthropogenic impacts on natural ecosystems.
      PubDate: 2017-10-01
      DOI: 10.1134/s0016702917100081
      Issue No: Vol. 55, No. 10 (2017)
       
  • Combined assessment of the ecological and geochemical state of
           anthropogenically impacted areas
    • Authors: E. M. Korobova
      Pages: 861 - 871
      Abstract: Based on the theoretical principles of biogeochemistry and evolutionary ecology, the geochemical structure of the modern noosphere was evaluated, and a method was developed for the combined assessment of the ecological and geochemical state of large anthropogenically impacted areas. It was demonstrated that persistent geochemically-induced endemic diseases are direct consequences of the development of human civilization. It was shown by the example of the iodine natural–anthropogenic province that the risk map of geochemically-induced endemic diseases constructed by overlaying map surfaces adequately reflects the modern ecological and geochemical state in any point of the region of interest. The proposed approach is valid for the solution of a wide range of environmental geochemical problems.
      PubDate: 2017-10-01
      DOI: 10.1134/s0016702917100068
      Issue No: Vol. 55, No. 10 (2017)
       
  • A.P. Vinogradov’s concept of biogeochemical provinces and its
           development
    • Authors: V. V. Ermakov
      Pages: 872 - 886
      Abstract: This paper addresses the concept of biogeochemical provinces introduced by A.P. Vinogradov and developed by V.V. Kovalsky and other researchers. The importance of this scientific direction was emphasized in the context of the anthropogenic impact on the biosphere. The most general characteristics, genesis, and evolution of biogeochemical provinces were discussed. Special attention was given to modern natural–anthropogenic biogeochemical provinces and anomalies. It was pointed out that this modern and vitally important scientific direction should be further pursued.
      PubDate: 2017-10-01
      DOI: 10.1134/s0016702917100044
      Issue No: Vol. 55, No. 10 (2017)
       
  • Landscape–biogeochemical factors of transformation of the Cs-137
           contamination field in the Bryansk region
    • Authors: V. G. Linnik; I. V. Mironenko; N. I. Volkova; A. V. Sokolov
      Pages: 887 - 901
      Abstract: Data are presented on the distribution of Chernobyl-derived 137Cs in different landscapes of the Bryansk region. The role of different landscape-biogeochemical factors in the transformation of the 137Cs contamination field is examined. The distribution of 137Cs in the typical soil catenary junction of predpolessie, predopolje, and opolje landscapes is analyzed. The role of biogeochemical barriers in the 137Cs accumulation is considered. It is revealed that the slope exposure affects the intensity of geochemical migration. In particular, the intensity of lateral migration of 137Cs on the slopes of the southern and southwestern exposure is much higher than that on the slopes of the northern and northeastern exposure. The different types of geochemical lateral structure of landscape are analyzed on the basis of the catenary 137Cs distribution.
      PubDate: 2017-10-01
      DOI: 10.1134/s001670291710007x
      Issue No: Vol. 55, No. 10 (2017)
       
  • Biogeochemical indication: Current state and development outlooks
    • Authors: S. F. Tyutikov
      Pages: 902 - 910
      Abstract: The paper presents analysis of the current state of the biogeochemical indication of the status of heavy metals and vital trace elements in various environmental objects in relation to physiological reactions of organisms. Aspects of the application of different methods of phyto- and zooindications are assessed, and integral techniques are reviewed that are based on the use of homogeneous living matter and molecular biogeochemical markers for the purposes of ecological monitoring of the environment at various anthropogenic impacts.
      PubDate: 2017-10-01
      DOI: 10.1134/s001670291710010x
      Issue No: Vol. 55, No. 10 (2017)
       
  • Formation of organic substances of humus nature and their biospheric
           properties
    • Authors: M. I. Dinu
      Pages: 911 - 926
      Abstract: Hypotheses of humus formation on the basis of polymerization and oxidation reactions were considered. The most popular models of several authors and the general understanding of the structural features of natural polymers were analyzed. Multivariate statistical analysis was performed for zonal factors affecting the formation of humic substances. Evolutionary changes in the understanding of the biospheric functions of humus substances were evaluated. Statistical procedures were proposed for the prediction of the physicochemical behavior of humus substances in environments.
      PubDate: 2017-10-01
      DOI: 10.1134/s0016702917100032
      Issue No: Vol. 55, No. 10 (2017)
       
  • Essential elements in the organs and tissues of fish depending on the
           freshwater toxicity and physiological state
    • Authors: N. A. Gashkina
      Pages: 927 - 934
      Abstract: The distribution of essential elements (Са, Mg, Na, K, Zn, Cu, Mn, Co) in organs and tissues in basins with different water toxicity is considered by the example of bream Abramis brama L. The models of redistribution of essential elements in the liver and kidney of the fish are developed depending on the physiological state, which is estimated by the concentration of hemoglobin in blood, total disease, and body mass index. It is shown that essential elements can serve as markers of intensity and direction of metabolic processes in the fish organism.
      PubDate: 2017-10-01
      DOI: 10.1134/s0016702917100056
      Issue No: Vol. 55, No. 10 (2017)
       
  • Environmental geochemistry of mercury in the area of emissions of the
           Karabashmed copper smelter
    • Authors: Yu. G. Tatsii; V. N. Udachin; P. G. Aminov
      Pages: 935 - 945
      Abstract: Mercury emissions during production of blister copper at the smelter Karabashmed are roughly estimated. The high mercury content in the atmospheric dust, soils, lake sediments of the Karabash geotechnogenic system shows that emissions of the plant are the main source of environmental contamination. The mercury content in soils of residential territory ranges within 0.2–11.4 mg/kg, reaching 15 mg/kg in soils of the impact zone. The maximum mercury content in the bottom sediments of Lake Serebry is 32 mg/kg. The high degree of contamination by other elements of emissions (Cu, Pb, Zn, As, Cd) is also demonstrated. Obtained results justify the need for the instrumental control of mercury in emissions.
      PubDate: 2017-10-01
      DOI: 10.1134/s0016702917100093
      Issue No: Vol. 55, No. 10 (2017)
       
  • Biogeochemical cycles in tundra ecosystems in areas impacted by gas
           industry facilities
    • Authors: V. N. Bashkin
      Pages: 946 - 956
      Abstract: Data acquired by monitoring modern biogeochemical cycles in tundra ecosystems in zones impacted by facilities of the gas industry indicate the absence of any perceptible changes in the system surface water–bottom sediments–soil–plants and show that the emitted nitrogen oxides beneficially affect productivity of the lichens and the functioning of the tundra ecosystem as a whole.
      PubDate: 2017-10-01
      DOI: 10.1134/s0016702917100020
      Issue No: Vol. 55, No. 10 (2017)
       
 
 
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