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Browsing ELibrary by Title
Now showing items 5620-5639 of 26297
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(1995)The olivines in the Kaba and Mokoia CV3 carbonaceous chondrites range from almost pure forsterite (Fo99.6) to almost pure fayalite (Fa99.9). Individual grains of fayalite of such high purity have not previously been reported ...
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(1994)We report ten occurrences of high-fayalite (Fa56–99 mol%; four with Fa> 82 mol%) olivine in association with silica in type-3 ordinary chondrites. Pyroxene with high Fs contents is much less common; Fs contents do not ...
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(1998)Spindle-shaped fayalitic halos occur in forsterites of the Allende, Kaba, Mokoia, Vigarano, and Ningqiang carbonaceous chondrites. The halos have (1) ellipsoidal or, less commonly, rounded shapes; (2) long axes parallel ...
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(1998)Spindle-shaped fayalitic halos occur in forsterites of the Allende, Kaba, Mokoia, Vigarano, and Ningqiang carbonaceous chondrites. The halos have (1) ellipsoidal or, less commonly, rounded shapes; (2) long axes parallel ...
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(2003)Using synchrotron X-ray fluorescence (XRF) microanalysis, including XRF tomography, and X-ray absorption near-edge structure (XANES) analyses, the distribution, and nature of incorporation of Fe and Ni impurities in as-grown ...
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(2006)Magmatic iron meteorites are considered to be remnants of the metallic cores of differentiated asteroids, and may be used as analogues of planetary core formation. The Fe isotope compositions (δ57/54Fe) of metal fractions ...
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(2005)Iron sulfide phases are the ultimate repository of iron and reduced sulfur in sediments. The sulfur isotope geochemistry of pyrite has had much to tell us about modern and ancient Earth environments and it is likely that ...
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(2004)Iron, the fourth most abundant element in the Earth’s crust, has four naturally occurring stable isotopes: 54Fe (5.84%), 56Fe (91.76%), 57Fe (2.12%), and 58Fe (0.28%), and the natural, mass-dependent isotope variations of ...
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(2004)Fe released into solution is isotopically lighter (enriched in the lighter isotope) than hornblende starting material when dissolution occurs in the presence of the siderophore desferrioxamine mesylate (DFAM). In contrast, ...
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(2001)Ten montmorillonites of different origins with variable Fe contents were analysed using transmission IR spectroscopy. Special attention was devoted to the OH-bending region to obtain information about the distribution of ...
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(2003)Fe-Mg interdiffusivities in (Fe,Mg)O magnesiowustite have been measured in experiments conducted at pressures of 7-35 GPa and temperatures of 1573-1973 K using a Kawai-type high-pressure apparatus. The diffusion profiles ...
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(2005)Published data on the distribution of Fe and Mg between the two distinct octahedral sites (M1 and M2) in orthopyroxenes show that the equilibrium Fe-Mg distribution coefficient (KD) is roughly constant at intermediate ...
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(2001)The partitioning of Mg and Fe between magnesiowüstite and ringwoodite solid solutions has been measured between 15 and 23 GPa and 1200–1600°C using both Fe and Re capsule materials to vary the oxidation conditions. The ...
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(1985)Low-cordierites from volcanic rocks of Tuscany (Italy), Lipari (Italy), and of the Cerberean Cauldron (Australia) were investigated. Both single crystal structure refinements and optical data indicate that the Italian ...
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(2000)We examine Fe-Mg-Mn relations of meteorites, as represented on plots of molar Fe/Mg ratio vs. molar Fe/Mn ratio, and use them to consider whether it is meaningful to classify achondrites as ''primitive'' or ''evolved.'' ...
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(2006)Fourteen Cr-spinels from Albanian ophiolites were examined. Fe2+/Fe3+ ratios were obtained by 57Fe Mössbauer spectroscopy (MS) and compared with ratios retrieved by electron microprobe analyses (EMPA). MS spectra were ...
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(2003)We have determined the equilibrium Fe2+–Mg fractionation between orthopyroxene and spinel in the ferromagnesium system at 0.9–1.4 GPa, 850–1,250°C, and also as a function of the Cr/Al ratio of spinel at 1.24 GPa, 1,000°C. ...
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(1999)The equilibrium intracrystalline distribution coefficient, k D *, of Fe* (i.e. Fe2+ + Mn) and Mg between the M1 and M2 sites of three natural nearly binary Fe2+-Mg orthopyroxene crystals (Fs14, Fs15 and Fs49) were determined ...
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(2004)X-ray absorption fine structure (XAFS) measurements at the Fe and Mn K-edges were undertaken to investigate the Fe2+-O and Mn2+-O bonding, and Fe2+- and Mn2+-vibrational properties for a series of synthetic almandine-spessartine, ...
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(2000)Single crystals of several varieties of dumortierite, an orthorhombic, pseudohexagonal borosilicate mineral with spectacular colour and pleochroism, were studied by electronic absorption spectroscopy and electron-microprobe ...
Now showing items 5620-5639 of 26297