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  Subjects -> ENGINEERING (Total: 2169 journals)
    - CHEMICAL ENGINEERING (186 journals)
    - CIVIL ENGINEERING (168 journals)
    - ELECTRICAL ENGINEERING (92 journals)
    - ENGINEERING (1176 journals)
    - ENGINEERING MECHANICS AND MATERIALS (356 journals)
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    - MECHANICAL ENGINEERING (81 journals)

CHEMICAL ENGINEERING (186 journals)                  1 2     

AATCC Journal of Research     Full-text available via subscription   (Followers: 2)
ACS Combinatorial Science     Full-text available via subscription   (Followers: 10)
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: 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: 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: 11)
Anti-Corrosion Methods and Materials     Hybrid Journal   (Followers: 5)
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  
Biomass Conversion and Biorefinery     Partially Free   (Followers: 6)
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: 5)
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: 23)
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: 21)
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: 11)
Chemical Papers     Hybrid Journal   (Followers: 3)
Chemical Product and Process Modeling     Hybrid Journal   (Followers: 3)
Chemical Reviews     Full-text available via subscription   (Followers: 166)
Chemical Society Reviews     Full-text available via subscription   (Followers: 33)
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: 135)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 6)
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: 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: 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)
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)
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: 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     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: 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)
Journal of Chemical Engineering & Process Technology     Open Access   (Followers: 3)
Journal of Applied Crystallography     Hybrid Journal   (Followers: 4)
Journal of Applied Electrochemistry     Hybrid Journal   (Followers: 13)
Journal of Applied Polymer Science     Hybrid Journal   (Followers: 124)
Journal of Biomaterials Science, Polymer Edition     Hybrid Journal   (Followers: 8)

        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]
  • Hydrogeochemistry of high fluoride groundwater in hard rock aquifer in a
           part of Dharmapuri district, Tamil Nadu, India
    • Abstract: Abstract Fluoride is one of the important ions that affect the groundwater quality. F− concentration above 1.5 mg/L in drinking water affects teeth and bones of humans. Usually the F− concentration in groundwater is controlled by local geological setting and climatic condition of an area. The present study aims to assess the hydrogeochemistry of groundwater in Vaniyar River basin, Dharmapuri district and to understand the F− abundance in groundwater. Forty four representative groundwater samples were collected for once in two months and analyzed for major cations and anions using ion chromatograph. The general order of the dominance of major cations is Na+ > Ca2+ > Mg2+ > K+ and that of major anions is Cl− > HCO 3 − > SO 4 2− > CO 3 − > F−. Most of the samples are Na-Cl type and few are Ca-Mg-Cl and Ca-Cl types. The F− concentration in groundwater of this region ranges from 0.15 to 6.48 mg/L and many of the residents are affected by dental and skeletal fluorosis. The arid climatic conditions of the region, dominance of gneissic rocks and the low freshwater exchange due to periodical drought conditions endorse the presence of high F− concentration in the groundwater of the area.
      PubDate: 2015-06-01
       
  • New data on zircon geochemistry and age (U-Pb, SHRIMP II) of the
           Yastrebetskoe Zr-REE-Y deposit, Ukrainian shield
    • PubDate: 2015-06-01
       
  • Solubility of ZrO 2 , HfO 2 , Ta 2 O 5 , Nb 2 O 5 , and H 2 O + H 2 in
           fluid-saturated haplogranite melt at 100 MPa, 800°C, and variable
           redox conditions
    • PubDate: 2015-06-01
       
  • Types of OH-bearing point defects in olivine and their transformation
           under changing petrological conditions
    • Abstract: Abstract In this paper, we characterize the most common coupled point defects in the olivine structure of the hydrous olivine {v Me, 2OH−}, humite {v Si, 4OH−}, laihunite {v Me, 2Fe3+}, hydroxyl {v Me, Fe3+, OH−}, and Schottky {v Me, v O} types, where v is a vacancy. Their segregation and evolution under changing physicochemical conditions were considered. During the development of deformation textures, the segregation of {v Me, 2OH−} and {v Si, 4OH−} defects is accompanied by the formation of planar features in olivine consisting of hydrous olivine, n(Mg,Fe)2SiO4 · MgH2SiO4, and humite-like layers, n(Mg,Fe)2SiO4 · Mg(OH)2, respectively. Under the conditions of low-temperature oxidation, the segregation of {v Me, 2Fe3+} defects in anhydrous olivine results in the formation of planar laihunite-type defects. The OH-bearing defects undergo dehydrogenation and oxidation during heating with decompression, which results in the transformation of hydrous olivine-type defects into laihunite-type {vMe, 2Fe3+} or hydroxyl-type {v Me, Fe3+, OH−} defects. The mobility of coupled point defects and their ability to segregate and form new phases in the host olivine, the possibility of releasing a proton with transformation into defects of a different type, and potential role as an oxidizer in dehydrogenation processes are manifested upon changes in physicochemical conditions and can be considered as indicators of geologic processes accompanied by variations in P, fO2, and aH2O.
      PubDate: 2015-06-01
       
  • Provenances of the paleozoic terrigenous sequences of the Oldoi terrane of
           the Central Asian orogenic belt: Sm-Nd isotope geochemistry and U-Pb
           geochronology (LA-ICP-MS)
    • Abstract: Abstract The results of Sm-Nd isotope geochemical investigations of the Paleozoic terrigenous sequences of the Oldoi terrane and U-Pb dating of detrital zircons by the LA-ICP-MS technique showed that the clastic material was mainly derived from Late Precambrian granitoids and Early to Middle Paleozoic granitoids and volcanics, which were formed owing to the reworking of the Late Precambrian continental crust. During the Silurian, the main source of terrigenous material in the sedimentation basin was the erosion of Late Precambrian and Early Paleozoic granitoids. In the Devonian, provenances became more diverse, and the sedimentation basin was additionally supplied by the decomposition products of Middle Paleozoic granitoids and silicic volcanics. The age ranges obtained for detrital zircons from the sandstones of the Middle-Late Devonian Oldoi Formation and the Early Carboniferous Tipara Formation are almost identical to the stratigraphic ages of the formations, which indicates that terrigenous sedimentation in the Oldoi terrane had been accompanied, at least since the Middle Devonian, by vigorous magmatic activity and occurred in an environment of a mature island arc or an active continental margin.
      PubDate: 2015-06-01
       
  • Sources of the magmatic rocks of the Mendeleev Rise, Arctic Ocean:
           Evidence from isotope-geochemical data
    • Abstract: Abstract Mineralogical-petrographic and isotope-geochemical studies were carried out for basic and intermediate magmatic rocks derived by deep-water drilling and dredging at the test sites from 79.02° N to 83.09° N, Arctic Ocean (AO), during expedition “Arktika-2012” with the icebreaker Kapitan Desnitsyn. Volcanic bedrock samples derived from the drill holes at the foot of the Mendeleev Rise are grouped into the low- and moderate alkali rocks, showing narrow ranges in the initial Nd (ɛNd(T) from +4.3 to +7.0) and Sr (87Sr/86Sr from 0.70365 to 0.70495) isotope ratios, and correspond to the volcanic rocks of the oceanic islands and rises in the discriminant isotope and geochemical diagrams. Gabbro-dolerite samples dredged from the slopes of the Mendeleev Rise are grouped into the low-alkali field and show wide variations in Nd (ɛNd from −33.1 to +2.9) and Sr (87Sr/86Sr from 0.7050 to 0.7233) isotope compositions, being similar to the Siberian flood basalts and, possibly, other rocks of continental genesis.
      PubDate: 2015-06-01
       
  • Synorogenic clay rocks: Specifics of bulk composition and paleotectonics
    • Abstract: Abstract The paper is devoted to the specifics in the chemical composition of synorogenic clay rocks in various environments: the Ural foredeep, Olyutorskii terrane, Dnestr pericratonic trough, Indus-Gang trough, etc. The compositions of the rocks are plotted in conventionally utilized discriminant paleotectonic diagrams. It is demonstrated that the bulk composition of such rocks, which were formed under active tectonic conditions typical of the collisional evolutionary phase of mobile belts, reflects the nature of the rock assemblages produced during both the divergent and the convergent (including collisional) phases. Their mean composition is the closest to PAAS as an integrated parameter of the average composition of the continental crust. The materials presented in the publication suggest that data on the bulk composition of clay rocks shown in conventionally utilized discriminant diagrams, such as SiO2-K2O/Na2O, K2O/Na2O-SiO2/Al2O3, are insufficient to reproduce the tectonic environments in which these rocks were formed.
      PubDate: 2015-06-01
       
  • Geochemistry of manganese ores from the southern folded margin of the
           Siberian Platform
    • Abstract: Abstract We present geochemical data on the composition of manganese ores associated with volcano-sedimentary sequences of the Olkhon and Ikat terranes located at the southern folded margin of the Siberian Platform. The study shows that hydrothermal activity was the major source of manganese supply to the sedimentation basin. The geochemical and isotopic data suggest that the manganiferous sediments were deposited at a distance from the source of hydrothermal activity under the conditions of suppressed terrigenous sedimentation. The lenticular shape and small thickness of the ore bodies suggest that they were deposited in small troughs within a larger deep-water basin.
      PubDate: 2015-06-01
       
  • The patterns in accumulation of chemical elements by higher plants and
           their responses in biogeochemical provinces
    • Abstract: Abstract The patterns in establishment of elemental composition in plants depending on specific landscape and geochemical features, different types of climate, and plant systematic affiliation are analyzed with the focus on hyperaccumulator plants, forming specialized endemic floras in biogeochemical provinces with excess trace element concentrations. The plant metal tolerance is an integrated problem. Within the considered research field, the metal-tolerant plants present a scientific interest, being the centers for emergence of new varieties (evolutionary aspect). Different responses (floristic, physiognomic, etc.) observed in plants growing in deposits are indicators for searching for ores. Hyperaccumulators are promising in phytoremediation of polluted soils.
      PubDate: 2015-05-01
       
  • Biogeochemical processes in tropical seagrass beds and their role in
           determining the productivity of the meadows
    • Abstract: Abstract Porewater nutrient profiles such as nitrate (0.33–1.38 μM), ortho phosphate (1.47–3.44 μM), total nitrogen (1.24–7.22 μM) and total phosphorus (3.51–5.98 μM) in seagrass ecosystem subjected to different nutrient loading indicated the limitation of porewater nutrients in all the strata of different sampling sites of Palk Bay region. Sediment pH in the seagrass beds were alkaline and anoxic condition increased with increase in depth (56.2 mV to −52.7 mV). Significant positive correlation was observed between silt content and carbon (r = 0.359, P < 0.05) and nitrogen contents (r = 0.381, P < 0.05) of the sediment. Specieswise interpretation also indicated C/N ratio of the stations greatly promoted the biomass in Halodule pinifolia and Cymodocea serrulata. The sediment C/N stoichiometry (4.7: 1–16: 1) indicated that autochthonous C sources regulates the C biogeochemical processes in seagrass ecosystem which is well corroborated by the least square regression value (R 2 = 0.92) obtained between the C/N ratio and biomass. Meanwhile, the N/P ratio (11.7: 1–17.2: 1) indicated P deficiency in the seagrass beds. Though, nitrogen limitation was evident in the porewater, but it has not reflected on seagrass biomass and productivity which is, evidenced by the higher biomass of individual species. Nutrient biogeochemical transformations across the sediment-water interface influence the productivity of seagrasses in the Palk Bay region. In addition, nutrient pollution, eutrophication and light limitation due to algal mats decreased the growth of seagrasses which need to be attempted to develop the nutrient policies for sustainable management and restoration of seagrass ecosystem.
      PubDate: 2015-05-01
       
  • Accumulation of heavy metals by North Caucasian plant species of the
           Cruciferae family in regards to phytoremediation
    • Abstract: Abstract Heavy metals (Fe, Zn, Mn, Cu, Ni, Co, Pb, and Cd) were analyzed in 61 samples of plant species of the family Cruciferae and 23 samples of North Caucasian soils developed on ultramafic, mafic, and felsic bedrocks. The study revealed the dependence between the chemical composition of plants, geochemical environments, and the taxonomic position of species. We identified two species, Arabis sagittata, an accumulator of Zn, Cu, Ni, and Alyssum murale, a hyperaccumulator of Ni, which can be effective in phytoremediation of heavy-metal contaminated soils.
      PubDate: 2015-05-01
       
  • Composition and age of zircons from the Orekhovo-Pavlograd shear zone
           (Ukrainian Shield): a contribution to the reconstruction of geological
           evolution
    • Abstract: Abstract We performed a joint analysis of SHRIMP II U-Pb ages (68 measurements for 5 rock types) and trace and rare-earth element compositions of zircons (41 determinations made in the same points that were utilized for measurement of U-Pb isotope ratios) from the complex Orekhovo-Pavlograd shear zone of the Ukrainian Shield. It was determined that this zone is composed of rocks of different age: 3.5, 3.4, 2.8, and 2.0 Ga. The main stage of structural-metamorphic reworking took place 2.0 Ga and lasted for over 30 Ma. It was established that fluid reworking of zircons was accompanied by an increase of LREE content and decrease of Ce anomaly. The preservation of U-Pb system in some zircons with high LREE contents may be explained by their solid state transformation.
      PubDate: 2015-05-01
       
  • Biogeochemical features of the distribution of organic compounds and
           particulate matter in the snow-ice cover in East Antarctica
    • Abstract: Abstract The distribution of particulate organic carbon Corg (bulk contents of organic compounds), chlorophyll a, lipids, and hydrocarbons (in dissolved and particulate forms), as well as particulate matter in snow, ice, and under-ice water was analyzed in the coastal areas of the Community and Lazarev seas (March–April, 2010, 2012). The differences in the accumulation of the studied compounds depend on the physical conditions of the ice formation and biogeochemical processes at the snow-ice and ice-water interfaces. The H2S contamination in association with extremely high contents of the studied organic compounds was established for the first time in the lower succession of multiyear ice, beneath a thick firn layer. It was shown that the conditions of formation of snow-ice cover define the vertical distribution of not only physical but also biogeochemical parameters.
      PubDate: 2015-05-01
       
  • Some tendencies in the development of the concept of balanced
           biogeochemical cycles of chemical elements
    • Abstract: Abstract The paper addresses theoretical and applied aspects of the method of balance of chemical elements in landscapes. It is demonstrated how ignoring the atmospheric cycle leads to misinterpretations of migration processes and errors in predicting the functioning of geosystems. The evapotranspiratory material transfer in the background taiga landscapes in the Urals is evaluated, and evapotranspiration is demonstrated to significantly decrease the imbalance of the material fluxes.
      PubDate: 2015-05-01
       
  • Mesozoic-Cenozoic sedimentation in the circum-arctic belt. 2.
           Cretaceous-Paleogene
    • Abstract: Abstract New data from the literature on the Cretaceous-Paleogene of the Circum-Arctic belt were used to revise lithological-paleogeographic maps published in 1983 by V.E. Khain, A.B. Ronov, and A.N. Balukhovskii. The region of our study is bounded by the present-day break of the continental shelf of the Arctic Ocean in the north and the 60° N latitude in the south. The legend was simplified by omitting climatic and tectonic information and emphasizing lithofacies zoning. For each map, we calculated the areas and volumes of sediments of the distinguished lithofacies zones and particular rock groups. These data were used to estimate the masses of dry sediments and accumulation rates. The distinguished variations of these quantitative parameters in the Circum-Arctic belt were compared with respective global trends related to tectonic and climatic changes. The contributions of regional features of sedimentation and magmatism were identified. It was concluded that the global trends were the dominant factor controlling regional sedimentation history. Two stages, Cretaceous and Paleogene, were distinguished in the history of sedimentation.
      PubDate: 2015-05-01
       
  • Fluid regime of initial granite-forming processes in metamorphic complexes
           of various pressure: A case study of the western Baikal metamorphic belt
    • Abstract: Abstract Syncollisional granite generated in zonal metamorphic complexes at 500–700°C and various pressure and in the presence of fluid of various composition are proved to differ in proportions of granite material generated by metamorphic, metasomatic, and magmatic processes. Monometamorphic low-pressure complexes devoid of the influx of foreign solutions are characterized by the most intense metamorphic differentiation: the dissolution and redeposition of quartz and plagioclase into lower pressure zones and the development of plagiomigmatites. The process starts with deformations of the schists at 500–550°C. The main factors (at a constant total composition of the rock) is an uneven pressure distribution and metamorphic solutions. This stage is followed by metasomatic granitization, which is initiated if shear motions and decompression are associated with influx of silicic alkaline solutions into the rocks and their transformation into migmatite (up to granite-gneiss). Granitization during this stage is controlled by an increase in the permeability of the rocks and the introduction of perfectly mobile Si, Na, and K and removal of Mg, Ca, and Fe, which modifies the composition of the rocks and makes them similar to granite. Metasomatic granitization may take place in low-pressure polymetamorphic complexes. Under a high lithostatic pressure and in the presence of water-carbon dioxide fluids (kyanite-sillimanite facies series of metamorphism), the magmatic process begins at higher temperatures. The early stages are dominated by metamorphic differentiation and metasomatic sodic migmatization. The rocks modified by these processes (their salic and mafic minerals are segregated) are affected by anatexis at 650–700°C (partial melting of the granite eutectic) and, at higher temperatures, by diatexis, which generates granite melts able to migrate. These processes are variably pronounced in all metamorphic complexes.
      PubDate: 2015-04-01
       
  • Geochemistry of the eclogites of the Maksyutov Complex, South Urals, and
           genetic nature of their protoliths
    • Abstract: Abstract Detailed mineralogical-petrographic and petrogeochemical characteristics are reported for eclogites of the Maksyutov Metamorphic Complex (MMC). It was established that protoliths of different varieties of eclogites (high-Ti, moderate- and low-Ti eclogites, graphite eclogites, and eclogites of the layered body) were mafic magmatic rocks of different affinity. The petrogeochemical comparison of MMC eclogites with the Early Paleozoic lithotectonic complexes of the South Urals shows that the eclogites are close to basalts formed in different geodynamic settings that existed in the region in the Cambrian (?)-Ordovician-Silurian(?) time. Subduction of oceanic crust and subsequent rise to the surface resulted in the spatial juxtaposition of bodies, the protoliths of which were formed at the initial and island arc stages of the evolution of the Paleo-Ural Ocean. Thermodynamic calculations of mineral assemblages of eclogites showed that low-Ti eclogites (680–700°C, 24 kbar), graphite eclogites (660–710°C, 17–18.8 kbar), and eclogites of the layered body (610–730°C, 16–18 kbar; 410–430°C, 12.5–13 kbar) were formed at similar temperatures but at a large scatter in pressure. It was concluded that the pressure variations were caused by the tectonic juxtaposition of bodies during exhumation of eclogites formed at different depths of subducted plate.
      PubDate: 2015-04-01
       
  • Geochemical indicators of paleoclimatic changes in the Cenozoic deposits
           of the Lower Aldan Basin
    • Abstract: Abstract Major and trace element composition of the Upper Cenozoic deposits of the Chuya section (the lower reaches of the Aldan River, Central Yakutia) made up of the Middle Miocene and Neopleistocene sediments was studied as indicator of paleoclimatic conditions. It was established that primary sediments were precipitated under moderately humid conditions in the Middle Miocene and under subarid climatic conditions at relatively high sedimentation rates in the Neopleistocene. Close contents of trace elements in all lithologies suggest that the source area remained constant. Variation trends of ICV index indicate an increasing role of fluvioglacial accumulation during formation of Pleistocene beds. It was determined that the Neopleistocene is marked by a sharp change in sedimentation conditions.
      PubDate: 2015-04-01
       
  • Geochemical indicators of paleo-typhoons in shelf sediments
    • PubDate: 2015-04-01
       
  • Thermodynamic properties of platinum chloride complexes in aqueous
           solutions: Derivation of consistent parameters from literature data and
           experiments on Pt (cr) solubility at 400–475°C and 1 kbar
    • Abstract: Abstract The solubility of Pt(cr) in acidic chloride solutions was measured at 400–475°C and P = 0.8–1.0 kbar using an autoclave technique and the analysis of the dissolved component after quenching. The PtCl 3 − complex was identified as the main Pt species at experimental parameters, m(NaCl) = 0.1–3.0 mol/kg H2O and m(HCl) ∼0.01. The thermodynamic parameters of the Helgeson-Kirkham-Flowers (HKF) model were determined for Pt2+ and Pt-Cl complexes (PtCl n 2−n n = 1–4) by analysis of literature data and their adjustment with obtained results. The solubility of Pt under supercritical P-T parameters calculated using these parameters is similar to Pd solubility. The thermodynamic properties and HKF model parameters for aqueous species determined in this study were incorporated into the on-line version of the FreeGC database (http://www-b.ga.gov.au/minerals/research/methodology/geofluids/freegs_about.jsp), which allows calculation of the Gibbs free energy of system components and equilibrium constants of reactions with these species.
      PubDate: 2015-04-01
       
 
 
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