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Browsing ELibrary by Title
Now showing items 5319-5338 of 21821
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(1995)Using an iron hydroxide precipitation to concentrate the rare earth elements it was possible to obtain precise Nd isotopic data on ultramafic rocks. Four samples of unserpentinized harzburgite from the Voykar ophiolite, ...
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(2003)Boron is a typical lithophile element characterized by a significant accumulation in the Earth's crust (15 ppm) relative to the primitive mantle (0.6 ppm) [1]. In magmatic systems, boron behaves as an incompatible element ...
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(1998)Both (reduced) type I and (oxidized) type II chondrules from the primitive chondrites Allende, Semarkona, and Bishunpur, were analysed with ion microprobe for the carbon and hydrogen concentrations of their silicates. The ...
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(2001)Diffuse emissions of CO2 are known to be large around some volcanoes and hydrothermal areas. Accumulation-chamber measurements of CO2 flux are increasingly used to estimate the total magmatic or metamorphic CO2 released ...
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(1998)Surface analysis by X-ray photoelectron spectroscopy (XPS) in combination with Ar etching was performed on a lunar regolith sample from the Luna 16 drill-core. The sample contains only ~10% of glass spherules; these are ...
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(1999)Large isotopic deviations of 149Sm-150Sm and 157Gd-158Gd derived from neutron capture effects were observed in five enstatite achondrites (aubrites); Norton County, ALH78113, Cumberland Falls, Bishopville and Mayo Belwa. ...
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HIGH GROUNDWATER NITRATE CONCENTRATIONS INHIBIT EUTROPHICATION OF SULPHATE-RICH FRESHWATER WETLANDS (2004)During the last 60 years, pollution of the groundwater with NO3- has greatly increased in many parts of Europe, as a consequence of excessive use of manure and synthetic fertilisers. Monitoring of groundwater-fed wetlands ...
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(2004)This special issue developed partly from the open PAGES conference held in Moscow in May 2002. The dominant theme of the present collection of articles is the Late Pleistocene and Holocene paleoenvironmental history of ...
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(2003)A new sequence of axisymmetrical spherical mantle convection simulations has been computed to monitor the influence of mantle avalanches on the mantle thermal state. During an avalanche that is characterized by a high rate ...
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(2002)The concentrations of all rare earth elements (REE: La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu) in silicate glass, apatite and zircon were measured by an ion microprobe method with a high mass resolving power ...
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(2003)Phase relations and stability of a mixed-chain (21)-hydrous clinopyribole [(21)-MHP] were investigated using a multi-anvil apparatus in the P-T range 5-18 GPa and 1100-1600 °C in a simpli-fied KNCMASH-system. (21)-MHP is ...
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(2003)The first cold plasma ICP-MS (inductively coupled plasma mass spectrometer) Fe isotope study is described. Application of this technique to the analyses of Fe isotopes in a number of meteorites is also reported. The ...
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(1999)We present the analytical methods that have been developed for the first high-precision Fe isotope analyses that clearly identify naturally-occurring, mass-dependent isotope fractionation. A double-spike approach is used, ...
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(1996)We have determined liquid metal-liquid silicate partition coefficients for Ni, Co, Mo, W, P, Ga, and Ge at 10 GPa and 2000°C in a multi-anvil apparatus. Our sample containers were either MgO or Al2O3. The two different ...
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(1998)Using plane wave pseudopotential method within the local density approximation (LDA), we calculate single-crystal elastic constants (cij) of orthorhombic MgSiO3 perovskite, generally accepted to be the major component of ...
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(1999)In order to test the effect of very high pressures on the siderophile behaviour of two elements, Ni and Co, we have carried out diamond anvil cell experiments on Ni- and Co-bearing systems, up to 70 GPa. Observation of ...
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(1991)Synthetic spinel harzburgite and lherzolite assemblages were equilibrated between 1040 and 1300° C and 0.3 to 2.7 GPa, under controlled oxygen fugacity (f O2). f O2 was buffered with conventional and open double-capsule ...
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(2001)Fluids and melts have been trapped and analysed in high pressure experiments in the model mantle system MgO-SiO2-H2O at 6 to 10.5 GPa and 900 to 1,200 °C. The fluid/melt traps consisted of a diamond layer that was added ...
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(2003)We propose and demonstrate an approach involving use of C18 solid phase disk extraction coupled with high resolution mass spectrometry for obtaining non-invasive molecular level information on dissolved organic matter (DOM) ...
Now showing items 5319-5338 of 21821