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Browsing ELibrary by Title
Now showing items 6036-6055 of 21821
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(1996)The lunar Mg-suite, which includes dunites, troctolites, and norites, makes up to 20-30% of the Moon's crust down to a depth of #60 km. The remainder is largely anorthosite. This report focuses on norites (which consist ...
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(1994)Five coarse-grained Ca-Al-rich refractory inclusions (CAIs) from the Efremovka CV3 chondrite are analysed for their magnesium isotopic composition using an ion microprobe. The analysed inclusions represent the three common ...
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(1996)The potassium isotope composition of refractory phases in Efremovka CAIs has been measured by an ion microprobe. Extensive studies of terrestrial standards were carried out to ensure that the experimental procedures adopted ...
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(1997)A synthetic calcite crystal that exhibits surface-structure-controlled, differential incorporation of a trace element was examined by ion microprobe to determine whether the controls causing differential element incorporation ...
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(1998)We present here a study of plagioclase/melt partitioning of trace elements at their natural concentration levels, using sample charges from the widely cited plagioclase/melt partitioning experiments of Drake and Weill ...
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(2001)Using a combination of dielectric spectroscopy and atomistic computer simulation techniques, the dynamical behaviour of the loosely bound (Na+d K+hannel ions in nepheline has been investigated. The low-frequency dielectric ...
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(2000)We have developed a technique to measure abundances of Os, Ir, Pt, and Au in situ in Fe-Ni metal on a microscale using secondary-ion mass spectrometry. A Cs+ beam is used to generate negative secondary ions, and interferences ...
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(2002)Whether transition element isotopes can be fractionated at equilibrium in nature is still uncertain. Standard solutions of Cu and Zn were eluted on an anion-exchange resin, and the isotopic compositions of Cu (with respect ...
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(2001)The transport processes in anhydrous basalt melt were investigated experimentally in electrochemical cell apparatus, imposing a constant electric field with intensity E ranging from 0.11 to 1.26 V/cm at temperatures ...
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(2004)Epidote group is important rock-forming minerals which form in a variety of geological conditions. Crystal structure of epidote contains 9-coordinated A1 and 10-coordinated A2 sites, and three kinds of octahedral sites, ...
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(2005)Ionization constants for several simple amino acids have been measured for the first time under hydrothermal conditions, using visible spectroscopy with a high-temperature, high-pressure flow cell and thermally stable ...
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(1987)Accurate values of ionization constants of water over a wide range of temperatures and pressures are needed for a quantitative description of the properties of hydrothermal ore-generating solutions. The ionization constants ...
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(2001)The interaction of γ-rays with smectites induces paramagnetic defects in the structure of these clay minerals. The EPR spectra of three different smectites detect the creation of structural defects and trapping of organic ...
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(2004)Statistics of spectral resonance structures of the ionospheric Alfven resonances (IAR) in the ULF frequency range 0.1–5.0 Hz is presented on the basis of the analysis of data obtained from July 2000 to December 2002 (2.5 ...
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(2004)The magnetosphere-ionosphere-thermosphere subsystem is strongly coupled via the electric field, particle precipitation, heat flows and small scale interaction. Satellites in situ measurements and ground based complex ...
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(2002)The IR spectrum of ammonium-exchanged natural analcime (basalt, Nidym River, Siberian platform) exhibits several features that suggest a lowered symmetry for the NH4+ ion and that this is influenced by hydrogen bonding ...
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(1999)The concentrations of the platinum-group elements (PGE) Ir, Ru, Pt, and Pd were determined in 18 mantle-derived basalts from a variety of tectonic settings and six komatiites from three locations. All analyses were performed ...
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(1989)There are data indicating that geochemical anomalies (particularly of elevated iridium concentrations) in the sections through sedimentary rocks are confined to boundaries marked by considerable changes in animal life in ...
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(2004)We have synthesized hydrothermally sulfides of Fe, Cu, Pb, and Zn in the presence of Ir; 192Ir was employed as the radioactive tracer, and its distribution in run products was determined by autoradiography. None of the ...
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(1988)The authors determined the concentrations not only of iridium and palladium, but also of nickel in basalt and komatiite samples from Late Archean greenstone belts of the Baltic shield. Most information on iridium was ...
Now showing items 6036-6055 of 21821