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  Subjects -> ENGINEERING (Total: 2096 journals)
    - CHEMICAL ENGINEERING (176 journals)
    - CIVIL ENGINEERING (161 journals)
    - ELECTRICAL ENGINEERING (88 journals)
    - ENGINEERING (1157 journals)
    - ENGINEERING MECHANICS AND MATERIALS (330 journals)
    - HYDRAULIC ENGINEERING (53 journals)
    - INDUSTRIAL ENGINEERING (52 journals)
    - MECHANICAL ENGINEERING (79 journals)

CHEMICAL ENGINEERING (176 journals)                  1 2     

ACS Combinatorial Science     Full-text available via subscription   (Followers: 9)
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: 21)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 5)
Advanced Chemical Engineering Research     Open Access   (Followers: 9)
Advanced Powder Technology     Hybrid Journal   (Followers: 13)
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: 23)
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)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 5)
BMC Chemical Biology     Open Access   (Followers: 4)
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: 7)
Chemical and Engineering News     Free   (Followers: 4)
Chemical and Materials Engineering     Open Access   (Followers: 1)
Chemical and Petroleum Engineering     Hybrid Journal   (Followers: 9)
Chemical and Process Engineering     Open Access   (Followers: 3)
Chemical and Process Engineering Research     Open Access   (Followers: 5)
Chemical Communications     Full-text available via subscription   (Followers: 31)
Chemical Engineering & Technology     Hybrid Journal   (Followers: 24)
Chemical Engineering and Processing: Process Intensification     Hybrid Journal   (Followers: 10)
Chemical Engineering and Science     Open Access   (Followers: 3)
Chemical Engineering Communications     Hybrid Journal   (Followers: 10)
Chemical Engineering Journal     Hybrid Journal   (Followers: 20)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 16)
Chemical Engineering Research Bulletin     Open Access  
Chemical Engineering Science     Hybrid Journal   (Followers: 13)
Chemical Geology     Hybrid Journal   (Followers: 10)
Chemical Papers     Hybrid Journal   (Followers: 3)
Chemical Product and Process Modeling     Full-text available via subscription   (Followers: 3)
Chemical Reviews     Full-text available via subscription   (Followers: 348)
Chemical Society Reviews     Full-text available via subscription   (Followers: 31)
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: 252)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 6)
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: 3)
Chinese Journal of Chemical Physics     Hybrid Journal   (Followers: 1)
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: 7)
CORROSION     Full-text available via subscription   (Followers: 2)
Corrosion Engineering, Science and Technology     Hybrid Journal   (Followers: 22)
Corrosion Reviews     Full-text available via subscription   (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)
Ekologia : The Journal of Institute of Landscape Ecology of Slovak Academy of Sciences     Open Access  
Eksergi     Open Access  
Emerging Trends in Chemical Engineering     Full-text available via subscription  
European Polymer Journal     Hybrid Journal   (Followers: 41)
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)
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: 12)
Industrial & Engineering Chemistry     Full-text available via subscription   (Followers: 9)
Industrial & Engineering Chemistry Research     Full-text available via subscription   (Followers: 20)
Industrial Chemistry Library     Full-text available via subscription   (Followers: 4)
Info Chimie Magazine     Full-text available via subscription   (Followers: 2)
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     Full-text available via subscription   (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: 3)
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)
ISRN Chemical Engineering     Open Access   (Followers: 4)
ISRN Polymer Science     Open Access   (Followers: 11)
Journal of Applied Crystallography     Hybrid Journal   (Followers: 4)
Journal of Applied Electrochemistry     Hybrid Journal   (Followers: 12)
Journal of Applied Polymer Science     Hybrid Journal   (Followers: 225)
Journal of Biomaterials Science, Polymer Edition     Hybrid Journal   (Followers: 8)
Journal of Chemical & Engineering Data     Full-text available via subscription   (Followers: 10)
Journal of Chemical Ecology     Hybrid Journal   (Followers: 2)

        1 2     

Journal Cover   Geochemistry International
  [SJR: 0.491]   [H-I: 14]   Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1556-1968 - ISSN (Online) 0016-7029
   Published by Springer-Verlag Homepage  [2302 journals]
  • Impact of geochemical factors of aquatic environment on the metal
           bioaccumulation in fish
    • Abstract: Abstract Conceptions of the influence of geochemical factors on the penetrating ability and bioaccumulation of elements in fish are systematized. Two mechanisms have been proposed to explain the element detoxication in fish: (1) binding of metals by low-molecular sulfur-bearing proteins (metallothionein) with subsequent withdrawal and (2) sequestering in specific granules. It was shown that the low-mineralized and acidified waters provide higher penetrating ability and more intense accumulation of most metals. Most of the elements are better-able to penetrate in fish as ions, however, the large concentrations of Hg are accumulated in form of methylmercury. Original data on the contents and distribution of the majority of toxic elements (Hg, Cd, and Pb) are reported for fish from the Kola North basins. It was justified that the polymetallic contamination of waters causes a decrease of essential elements in the functionally important organs owing to the pathological disturbances. Technogenic-hydrogeochemical anomalies were distinguished in the Kola region (copper-nickel, strontium, and acidified hydrochemical provinces) on the basis of the element abundance in fish and the development of endemic pathophysiological disturbances. The elevated contents of some elements, including toxic metals, in fish in the Volga Basin are used to distinguish the hydrogeochemical provinces in the Lower Volga (Sr-Cd-Al-Cr-Ni), Middle Volga (Hg-Zn), and Upper Volga (Mn-Pb) regions.
      PubDate: 2015-03-01
       
  • Biogeochemical indication of environmental contamination: A case study of
           a large copper smelter
    • Abstract: Abstract The enrichment of different environments (atmospheric depositions, soil, water, bottom sediments) in elements that are transferred with atmospheric emissions of a copper smelter is demonstrated by the example of Lake Serebry, which is situated in the zone of direct and indirect air-borne anthropogenic impact. The bioaccumulation and bioconcentartion of elements in the organs and tissues of fish from Lake Serebry are estimated in comparison with those of Lake Seliger, which is located far away from mining-metallurgical complexes.
      PubDate: 2015-03-01
       
  • Geochemistry of grass biocenoses: Biogenic cycles of chemical elements at
           contamination of the environment with heavy metals
    • Abstract: Abstract The paper addresses the involvement of grass communities in biogenic cycles of chemical elements (Zn, Cu, Pb, Cd, Mn, Co, Cr, Ni, and Fe). Both the species composition and the suprasoil phytomass of phytocenoses in the Central Urals are modified in a gradient of contamination with heavy metals. The bioproductivity and subsequent mineralization of plant remnants are discussed with reference to two soil types that differ in agrochemical parameters. The contribution of agrobotanical groups to the biological exchange of chemical elements is proved to be controlled not only by the volume of annually dying suprasoil biomass but also by the intensity of processes mineralizing plant remnants in the contamination gradient. This modifies the cycles of chemical elements in natural contaminated biocenoses. The reaction of grass communities on environmental contamination can be viewed as partial counterbalancing of the adverse effect of chemical stress via maintaining a high enough level of the biological exchange of chemical elements.
      PubDate: 2015-03-01
       
  • Assessing the heavy metal pollution by the study of diatom assemblages
           from lacustrine sediments, European Russia
    • Abstract: Abstract The taxonomic structure of diatom assemblages from the modern lacustrine sediments of the Kola Peninsula and Ni concentration in them are analyzed. It was found that the degree of negative transformation of structure of diatom assemblages from small (< 1 km2) and medium-sized (1–4 km2) lakes shows significant correlation with the Ni concentration in surface waters. A method of graphical analysis was applied to study the variations of taxonomic proportions in the diatom assemblages, which are proposed to use during integrated paleoecological investigations of bottom cores from weakly studied lakes of Caucasus. The prospects of application of the integrated analysis of bottom cores taken from lakes of different genesis are estimated. Obtained results have demonstrated that small closed lakes are the most promising objects for the assessment of heavy metal pollution caused by the transboundary transfer.
      PubDate: 2015-03-01
       
  • Quantification of the role of organisms in the geochemical migration of
           trace metals in the ocean
    • Abstract: Abstract The contribution of biological processes to the geochemical migration of trace metals (Fe, Mn, Ni, Co, Cu, Zn, Cd, Pb, and As) was quantified for three geochemically distinctive areas of the ocean: continent—ocean boundary (marginal filter), euphotic zone of the open ocean, and deep-sea hydrothermal vent fields of the Mid-Atlantic Ridge. A new term “trace metal bioaccumulation potential” is introduced to compare the bioaccumulation intensity of different organisms. The bioaccumulation potential accounts for the ability of living matter to produce biomass. The bioaccumulation potential is calculated on the basis of mean whole-body concentrations of trace metals in the dominant communities and the biomass per unit area of the biotope. The results showed that the highest bioaccumulation potential is recorded in chemosynthesis-based benthic biota from deep-sea hydrothermal vent fields. At the same time, Fe, an essential heavy metal controlling a number of biochemical processes in organisms, was found to have the highest bioaccumulation potential, while Hg, a toxic heavy metal, has the lowest bioaccumulation potential. The bioaccumulation potential in the marginal filter and euphotic zone decreases in the following order Fe > Zn > Mn > Cu, whereas in deep-sea hydrothermal fields, the bioaccumulation potential of Mn is considerably lower, close to those of Pb, Co, Cr, and Cd. The order of trace metals bioaccumulation potential in biota is broadly similar in all three geochemically different regions. This implies that the bioaccumulation function of the biota is characterized by a geochemical resemblance in different parts of the ocean.
      PubDate: 2015-03-01
       
  • Interaction between metal ions in waters with humic acids in gley-podzolic
           soils
    • Abstract: Abstract The paper addresses complexation of metal ions with humic matter in soils. The functional specifics of humic matter extracted from gley-podzolic soils are estimated using spectrometric techniques. Conditional stability constants are experimentally determined for Fe(III), Cu(II), Pb(II), Cd(II), Zn(II), Ni(II), Co(II), Mn(II), Cr(III), Ca(II), Mg(II), Sr(II), and Al(III). The activities of metals are ranked according to their affinity to humic compounds in soils. The determined conditional stability constants of the complexes are tested in model experiments, and it is demonstrated that Fe and Al ions have higher conditional stability constants than ions of alkali-earth metals, Pb, Cu, and Zn.
      PubDate: 2015-03-01
       
  • Geochemical ecology and biogeochemical criteria for estimating the
           ecologic state of biospheric taxons
    • Abstract: Abstract The paper addresses progress in a modern avenue of science—geochemical ecology as a basis for geochemical normalizing—and analyzes the role of geochemical ecology in the system of ecological subdisciplines and its major concepts (biogeochemical food chains an parameters, biological migration of chemical elements, reactions of living organisms, including homoeostasis, biorhythms, threshold concentrations of chemical elements, etc.). The paper reports newly obtained data on the contribution of geochemical ecology to solving problems of biogeochemical normalizing and zoning and the prophylaxis of biogeochemical endemias and microelementoses, with emphasis placed on the pressing character of problems of geochemical ecology, first and foremost, in the aspect of the anthropogenic evolution of biospheric taxons.
      PubDate: 2015-03-01
       
  • Effect of the sources and evolution of solutions on the composition of
           metasomatites
    • Abstract: Abstract The effect of the composition of the sources and the thermal and baric evolution of metasomatic solutions on the character of metasomatic products was studied by numerically simulating solution-rock interaction. The rock sources of the solutions assumed in these simulations were shale, granite, and granodiorite. The relative acidity of the rocks and solutions interacting with them was suggested to estimate using the parameter \(A_R = \log \left( {a_{R^ + } /a_{H^ + } } \right) + \frac{1} {2}\log a_{H_2^O } \) (where R = K, Na). The values of this parameter in rocks differently vary with temperature and pressure and are controlled by buffer equilibria of minerals composing these rocks. The acidity of the solution relative to the source increases at cooling because of the more rapid dissociation of acids than salts and bases. However, the solution can be either more acidic or more alkaline relative to protoliths of other composition. Solutions derived from various sources but cooling in similar regime produce metasomatites of different composition. As the solution cools, feldspar metasomatites can grade into quartz-muscovite ones, which corresponds to the vertical temperature zoning of metasomatic aureoles. The alkalinity of solutions relative to their sources increases at their decompression, but the solutions may be less alkaline relative to protoliths of other composition. In contrast to cooling regime, solutions derived from all of the examined types of sources at decompression produce one of the feldspars and Ca, Mg, and Fe minerals, such as biotite, chlorite, amphibole, and magnetite. Quartz-free varieties of feldspathic metasomatites can be produced at either cooling or decompression but only by alkaline solutions. The potassic or sodic character of feldspathization at decompression depends on the composition of the source and the P-t conditions of solution generation.
      PubDate: 2015-02-01
       
  • Source of hydrocarbons in the supergiant Romashkino oilfield (Tatarstan):
           Recharge from the crystalline basement or source sediments?
    • Abstract: Abstract Romashkino is a supergiant oilfield in Tatarstan with reserves of more than 5 billion tons of oil. The relatively small thickness of the sedimentary cover on the South Tatar arch and the location of Devonian producing beds directly above the crystalline basement were used as arguments for speculations about a deep source of hydrocarbons and a role of the basement as a conduit for fluids. It was found that several wells at Romashkino exhibit “anomalous” behavior characterized by a steady and, sometimes, increasing production, which was interpreted as an indication of recharge from below along basement faults. We present the results of isotope and geochemical studies of crude oils from the sedimentary units of Tatarstan, oils from “anomalous” wells at the Romashkino field, and organic matter from both sedimentary and basement rocks. The results of isotope analysis (comparison of carbon isotopic compositions in the fractions) revealed a genetic link between oils from the sedimentary rocks and organic matter from the Late Devonian Domanik-type facies beds. Because the organic matter within the South Tatar arch does not reach sufficient maturity for hydrocarbon generation, we supposed that sediments of similar type and age (Domanik facies) in the deeper parts of the Ural foredeep and Buzuluk depression could be a likely source of hydrocarbons in this area. The study of oils from “anomalous” wells revealed their close similarity to the other oils from the sedimentary cover. The analysis of the composition of hydrocarbons, which are present in trace amounts in basement rocks, provided no evidence to support the role of deep abiogenic hydrocarbons in recharging oil pools at Romashkino and other fields of Tatarstan.
      PubDate: 2015-02-01
       
  • Role of germanium in isomorphic substitutions in quartz
    • Abstract: Abstract We investigated the kinetics of the incorporation of Al, Ti, and Ge impurities into the crystal structure of natural quartz at the second stage of isomorphic substitution after quartz crystallization. Quartz samples were experimentally annealed to model the accumulation of isomorphic admixtures under natural conditions. Trace elements were analyzed by the EPR technique. The evaluation of the kinetics of accumulation of isomorphic impurities suggested that there are two types of isomorphic substitutions in natural quartz. The role of each of them depends on the content of the mobile form of Ge in the mineral. If the Ge content in quartz is high, low-temperature substitutions with the maximum intensity at 400–500°C dominate. We proposed an interpretation for this type of isomorphic substitutions involving clusters of the high-temperature β—phase and Ge impurity as a catalyst. At low Ge contents, its role in isomorphic substitutions is played by silicon and oxygen vacancies. This type of isomorphic substitutions is significant at t > 650°C and high contents of vacancy-generating structural defects in quartz. Some specific features of isomorphic substitutions of each type of impurities were discussed.
      PubDate: 2015-02-01
       
  • Variations in the degree of catagenesis and hydrocarbon generation in the
           source rocks of the Sirt Basin, Libya
    • Abstract: Abstract The thermal history of the Sirt Basin and realization of its hydrocarbon potential were modeled using the GALO numerical simulation system and a refined database of temperatures measured at various depths, vitrinite reflectance, and detailed data on vertical sections of the basin. These models are more accurate than preexisting basin models, which were underlain by the assumption that the temperature gradient remained unchanging throughout the whole evolutionary history of the basin. The burial history, temperature variations, and the maturity of organic matter in the sedimentary rocks of major tectonic structures in the Sirt Basin were numerically simulated with regard for multiple tectonic (stretching) and thermal reactivation of the lithosphere beneath the basin. The modeling was conducted for eight seismic sections arranged along a profile trending from east to west, from the Cyrenaica Platform in the eastern flank of the basin to the Hun graben in its western flank. Along with the traditionally analyzed Sirt source rocks of Campanian age, we analyze the outlooks of hydrocarbon generation in the pre-Campanian rocks. Our modeling results suggest that organic matter (OM) of Lower Cretaceous rocks in the Hameimat, Ajdabiya, and Maradah troughs was highly mature when some hydrocarbons (HC) could decompose into gas and coke in the course of their secondary cracking. The rocks of the Upper Cretaceous formations (95-65 Ma), including the widely known source rocks of the Sirt Shale, Formation, can be viewed as intensely generating oil within all modeled areas of the basin, except only the Hun graben and the Zelten and Dahra platforms.
      PubDate: 2015-02-01
       
  • Fourteen International Conference on Physicochemical and Petrophysical
           Studies in Earth Sciences
    • PubDate: 2015-02-01
       
  • U and Th distribution in podzolic soil contaminated with soluble compounds
           of these elements
    • Abstract: Abstract Th and U transformations and distribution were studied in a long-term field experiment in the uppermost (0–50) cm layer of podzolic loamy soil contaminated with soluble compounds of these elements, and the role of the soil adsorbing complex in this process was evaluated. The paper reports regression equations that relate express U and Th concentrations in soil as functions of its bulk composition and physicochemical characteristics.
      PubDate: 2015-02-01
       
  • Study on classification and characteristics of crude oils in Baiyun
           deep-water Sag
    • Abstract: Abstract The geochemical characteristics of about 30 crude oil samples collected from Baiyun Sag were studied. These oil samples can be divided into two classes: class A and B, and 5 subclasses (A1.A2.A3.B1.B2). Samples in class A are located in the northern part of the sag, adjacent to Panyu Lower Uplift; samples in class B are located in the eastern part of the sag. Crude oils in Baiyun Sag indicate an oxidizing type of depositional environment, with a notable higher plant input, and mainly reflecting the lacustrine facies sedimentary characteristics. Oil samples are mature-high mature oil, with aromatic hydrocarbons having a wider range of chemical kinetics than saturated hydrocarbons, aromatic hydrocarbon maturity parameters are well pronounced and provide an effective means of measuring maturity compared to saturated hydrocarbon maturity parameters. In this study, based on integrated analysis of various parameters, the crude oils show mature-high mature oil characteristics, whereas class A has a high maturity compared to B.
      PubDate: 2015-02-01
       
  • Physicochemical parameters of formation of hydrothermal deposits: Evidence
           from fluid inclusions. III. Uranium deposits
    • Abstract: Abstract An original database, which was compiled by the authors, is continuously updated, and now contains data from more than 19 800 publications on fluid and melt inclusions in minerals, was utilized to review and synthesize data on the physicochemical parameters at which hydrothermal uranium deposits and occurrences were formed. The parameters discussed below are temperature, pressure, density, salinity, gas composition of the fluid, and U concentration in the hydrothermal fluid. The database contains data of fluid inclusions in minerals from 90 U deposits and occurrences worldwide. Histograms of the homogenization temperatures of fluid inclusions are presented for such typical minerals of these deposits and occurrences as quartz, calcite, and fluorite. The temperature range most favorable for the origin of U deposits is 100–200°C (67% of the 937 measured temperature values fall within this range), which makes U deposits remarkably different from higher temperature Au-Ag, W, and Sn deposits. These deposits also differ in the salinity of the fluids. The range of fluid salinity of 10–30 wt % equiv. NaCl includes 42% of fluid salinity values measured at U deposits (our database includes 937 measured values), 27% for Au-Ag deposits (10 237 measured values), 27% for W deposits (2333 measured values), and for Sn deposits (1981 measured values). The relatively low temperature of U-bearing fluids and their high salinity testify that these solutions had a high density: 94% of all measured values lie within the range of 0.8–1.2 g/cm3. Fluid pressure at U deposits broadly varied from 2500 to 300 bar and perhaps even lower values. Data on the chemical composition of the gas phase of the fluid inclusions show a significant diversity of the fluids contained in the inclusions. In certain instances, H2O-CO2 fluids give way to fluids rich in CH4 and N2 with minor amounts of hydrocarbons. Data are reported on the gas composition of fluid inclusions in the nuclear-reactor zone at three Precambrian U deposits. Analyses of individual inclusions were utilized to evaluate U concentrations in magmatic melts and mineral-forming fluids. The geometric mean U concentration in silicate melts of composition ranging from ultramafic to silicic is 0.92 ppm (8053 measured values), and the analogous values for the fluids is 1.21 ppm (271 measured values).
      PubDate: 2015-02-01
       
  • Geochemistry of seismoactive regional faults: Baikal Rift zone, east
           Siberia
    • Abstract: Abstract The contents of mobile ore elements Pb, Zn, Cu, Mo, Ag, Sn, As, Tl, Hg, as well as B and Fe group elements are determined and their distribution is studied in a loose cover and waters at the surface of the largest regional faults of the Baikal Rift Zone: Tunka, Barguzin, marginal suture of the Siberian Platform, and in the near-fault Kucheger thermal field. The amounts of O2, CO2, CO, CH4, H2S, SO2, Rn, and Rn-related ionization of ground air are measured in soil gases at the faults. Geochemical associations typical of faults were identified. The geochemical fluxes of their major elements and natural toxic elements As, Tl, and Hg on the subsurface geochemical barriers are calculated. Migration of ore elements is a function of near-fault heat flows, the surface values of which were estimated from distant Earth’s sounding data with establishing the dominant of convective component.
      PubDate: 2015-01-01
       
  • Isotope-geochemical data on ferruginous mineral waters: Conditions of
           formation of “Marcial Waters” resort, Karelia
    • PubDate: 2015-01-01
       
  • Compositional variability of pyrope in kimberlites at high pressures and
           temperatures
    • PubDate: 2015-01-01
       
  • The possibility of phosphatization of silicates in the supergene zone
    • PubDate: 2015-01-01
       
  • Fractionation of zirconium in pyroxenes of alkaline magmas
    • Abstract: Abstract Pyroxenes of the Lovozero Massif (Kola Peninsula) intensely accumulate zirconium. The Zr content in the pyroxenes varies from 0.01 to 2.3%. In the pyroxenes from the Eudialyte Complex, Zr content increases with increasing the stratigraphic height in the sequence of the Lovozero intrusion. In contrast, Zr concentration in pyroxenes from the Differentiated Complex show very uneven distribution. This is related to the crystallization of pyroxenes at different stages of melt evolution and to the variations in their alkalinity. The zirconium distribution in pyroxenes of the Lovozero Massif is determined by the fractional crystallization differentiation. The partition coefficient of zirconium between pyroxene and ultraalkaline magmatic system was determined for the first time on the basis of alkaline pyroxene—melt equilibrium in hypabyssal porphyritic lujavrites. The model of generation of zirconium (eudialyte) ores in the Lovozero Massif was developed using this value and equations of equilibrium and fractional crystallization.
      PubDate: 2015-01-01
       
 
 
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