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Browsing ELibrary by Title
Now showing items 6074-6093 of 21879
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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 ...
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(2004)A reappraisal of Hermann's ‘irite’, described in 1836 and 1841, has been attempted by examining and analysing three museum samples, accessioned before 1865. The three samples were determined to be mixtures of chromite, ...
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(2003)The influence of aqueous silica on the hydrolysis of iron(III) nitrate and chloride salts in dilute aqueous solutions (mFe ~ 0.01 mol/kg) was studied at ambient temperature using X-ray absorption fine structure (XAFS) ...
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(1996)Iron is a metabolic requirement of living systems, yet iron is very insoluble in aerobic, neutral environments. Therefore, the amount of iron in solution under these conditions is not sufficient to meet the nutrient ...
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(2003)Microbial processes within the ocean crust are of potential importance in controlling rates of chemical reactions and thereby affecting chemical exchange between the oceans and lithosphere. We here assess the oxidation ...
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(2002)The chemical status of major and trace elements (TE) in various boreal small rivers and watershed has been investigated along a 1500-km transect of NW Russia. Samples were filtered in the field through a progressively ...
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(1999)In order to verify Fe control by solution - mineral equilibria, soil solutions were sampled in hydromorphic soils on granites and shales, where the occurrence of Green Rusts had been demonstrated by Mossbauer and Raman ...
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(2003)The distribution of iron atoms in the octahedral sheet of a series of dioctahedral smectites with varying unit-cell composition and iron content was investigated by Fe K-edge XAS spectroscopy. First-step analysis reveals ...
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(1986)Manganese, iron, and helium isotopes have been measured in samples taken near the crest of the East Pacific Rise at 19°S. Samples were enriched in Mn and in He isotopes, as is typical for waters of this area. Samples were ...
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(1999)Iron is an important constituent of kornerupine, (,Mg,Fe)(Al,Mg,Fe) 9 (Si,Al,B) 5 O 21 (OH,F). We obtained Mössbauer spectra at 300 K on twelve samples with Fe 0.30–1.30 atoms per formula unit (apfu) and Fe 3 /Fe 0–0.31; ...
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(1992)Banded iron formations (BIF) are prominent in sediments older than 2 Ga. However, little is known about the absolute abundance of BIF in Archean and Early Proterozoic sediments, and the source of the Fe is still somewhat ...
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(2003)The Fe isotope composition of Proterozoic to modern clastic sedimentary rocks and aerosols defines a range in 56Fe values that is only slightly more variable than the range of Fe isotope compositions measured in terrestrial ...
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(2004)The iron isotope compositions of Shergotty–Nakhla–Chassigny (SNC) meteorites thought to come from Mars, eucrites and diogenites assumed to sample asteroid 4 Vesta, and rocks from the Moon and Earth have been measured using ...
Now showing items 6074-6093 of 21879