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Browsing ELibrary by Title
Now showing items 6293-6312 of 21934
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(2004)Results of fluid dynamical experiments are presented to model the kinematics of lithospheric subduction in the upper mantle. The experiments model a dense high-viscosity plate (subducting lithosphere) overlying a less dense ...
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(2003)The Vendian-Early Cambrian, Middle Cambrian, and Early Ordovician volcanosedimentary deposits of the Martaiga Block of the Kuznetsk Alatau paleoisland arc (55.5° N, 88° E) have been investigated paleomagnetically. Their ...
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(2004)The abundances of 18O and deuterium in the present and past hydrologic cycle have proven to be an important tool in Earth systems science. In contrast, the abundance of 17O in precipitation has thus far been assumed to ...
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(2003)Equilibrium and kinetic Fe isotope fractionation between aqueous ferrous and ferric species measured over a range of chloride concentrations (0, 11, 110 mM Cl−) and at two temperatures (0 and 22°C) indicate that Fe isotope ...
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(2002)Application of the Fe isotope system to studies of natural rocks and fluids requires precise knowledge of equilibrium Fe isotope fractionation factors among various aqueous Fe species and minerals. These are difficult to ...
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(2002)The mass-dependent fractionation laws that describe the partitioning of isotopes are different for kinetic and equilibrium reactions. These laws are characterized by the exponent relating the fractionation factors for two ...
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(1997)A growing body of evidence reveals that much of the silica that crystallizes at the Earth's surface is a finely intergrown mixture of quartz and moganite. To better understand the behaviour of both solid and aqueous silica ...
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(1997)Steady-state dissolution rates of a synthetic basaltic glass were measured in an open-system mixed flow reactor as a function of solution composition at a temperature of 90°C and over the pH range 7.8 to 8.3. The dissolution ...
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(2004)Dissolved oxygen (DO) and organic carbon (Corg) are among the highest- and lowest-potential reactants, respectively, of redox couples in natural waters. When DO and Corg are present in subsurface settings, other couples ...
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(2002)Mass transfer between sulfide and silicate liquids is often discussed by reference to a mass ratio between hypothetical liquid reservoirs at equilibrium, defined as R. In an open system not at equilibrium the mass of ...
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(2002)The specific heat of natural and deuterated lawsonite, CaAl2Si2O7(OH)(2)(H2O)-H-., has been measured in the temperature ranges 77 K-310 K, using ac calorimetry, and 230 K-320 K, using differential scanning calorimetry. ...
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(2002)The rain kinetic energy (KE) is a widely used indicator of the potential ability of rain to detach soil. However, rain kinetic energy is not a commonly measured meteorological parameter. Therefore, empirical laws linking ...
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(2006)Iron isotopic compositions measured in chondrules from various chondrites vary between ?57Fe/54Fe = +0.9? and -2.0?, a larger range than for igneous rocks. Whether these compositions were inherited from chondrule precursors, ...
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(2004)Laboratory experiments on reagent-grade calcium carbonate and carbonate rich glacial sediments demonstrate previously unreported kinetic fractionation of carbon isotopes during the initial hydrolysis and early stages of ...
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(2006)Experiments specifically designed to measure the ratio of the diffusivities of ions dissolved in water were used to determine DLi/DK, D7Li/D6Li, D25Mg/D24Mg, D26Mg/D25Mg, and D37Cl/D35Cl. The measured ratio of the diffusion ...
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(2002)To study what dictates oxygen isotope equilibrium fractionation between inorganic carbonate and water during carbonate precipitation from aqueous solutions, a direct precipitation approach was used to synthesize witherite, ...
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(2004)The following kinetic model was proposed for K-Na feldspar under dry conditions: Ci = C0exp[(K0RT 02)/(Qg)]exp[-Q/RT0] where C i is the aluminum content in the 2t1 position after completion of the ordering process, which ...
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(2001)The experimental studies of As2S3 (am) oxidative dissolution were investigated by use of particle sizes of 8 to 44 μm in a mixed flow reactor at 25 to 40°C and initial pH 7.3 to 9.4 to determine the effect of dissolved ...
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(2003)The kinetics of the dehydroxylation of chrysotile was followed in situ at high temperature using real-time conventional and synchrotron powder diffraction (XRPD). This is the first time kinetics parameters have been ...
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(1995)ZrO2 oxygen sensors, gas mixtures, and conventional solid buffers have been used for decades to either control or measure oxygen fugacity (fO2) at high temperatures. In dry systems below ca. 700°C these techniques were ...
Now showing items 6293-6312 of 21934