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Now showing items 7555-7574 of 39124
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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 ...
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(2004)Photoautotrophic bacteria that oxidize ferrous iron (Fe[II]) under anaerobic conditions are thought to be ancient in origin, and the ferric (hydr)oxide mineral products of their metabolism are likely to be preserved in ...
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(2004)In experiments investigating the causes of Fe isotope fractionation, the d56/54Fe value of Fe(II) remaining in solution (Fe(II)(aq)) after reduction of Fe(III) (goethite) by Shewanella putrefaciens is ;21.2‰ relative to ...
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IRON ISOTOPE FRACTIONATION DURING MICROBIALLY STIMULATED FE(II) OXIDATION AND FE(III) PRECIPITATION (2006)Interpretation of the origins of iron-bearing minerals preserved in modern and ancient rocks based on measured iron isotope ratios depends on our ability to distinguish between biological and non-biological iron isotope ...
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(2003)The purpose of this work is to study the mobility and budget of Fe isotopes in the oceanic crust and in particular during low-temperature interaction of seawater with oceanic basalt. We carried out this investigation using ...
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(2004)The effect of continental weathering on the iron isotope compositions of natural materials is investigated. Unweathered igneous rocks, pelagic clay, and dust fall within the range δ56Fe=0±0.3‰. Rivers with large suspended ...
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(2002)The local structure of iron in three tektites has been studied by means of Fe K-edge extended X-ray absorption fine structure (EXAFS) and high-resolution X-ray absorption near-edge structure (XANES) spectroscopy in order ...
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(2004)Iron-rich clay minerals are abundant in the natural environment and are an important source of iron for microbial metabolism. The objective of this study was to understand the mechanism(s) of enhanced reduction of Fe(III) ...
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(1989)The results of our detailed investigation of inclusions in moissanite from the Sytykan kimberlite pipe are given. Comparison of available information on inclusions in moissanite from different igneous rocks shows that they ...
Now showing items 7555-7574 of 39124