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Browsing ELibrary by Title
Now showing items 3591-3610 of 21879
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ELECTRON ENERGY-LOSS SPECTROSCOPY OF SILICATE PEROVSKITE-MAGNESIOWUSTITE HIGH-PRESSURE ASSEMBLAGES (2000)Silicate perovskite-magnesiowustite assemblages synthesized from natural olivine in the multi-anvil press and diamond-anvil cell were studied by electron energy-loss spectroscopy (EELS). Spectra of crystalline silicate ...
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(1996)Because monazite is extremely rich in U and Th, radiogenic Pb (* Pb) accumulates very quickly, and reaches, in about 100 Ma, a level where it is possible to analyse it with the electron probe. Assuming that common Pb is ...
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(1995)In order to identify the crystalline hosts for aluminium and calcium in the deep mantle, the high-pressure transformations of natural garnets (pyrope, grossular and Fe-rich garnet) have been prepared at high pressures (40 ...
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(2002)Gd-doped fluorapatite (1.2 +/- 0.2 wt% Gd2O3), synthesized from CaF2-rich melts, has been investigated as single crystals and powder samples by using X-band (similar to9.4 GHz) electron paramagnetic resonance (EPR) ...
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(2002)A W-band (94 GHz) electron paramagnetic resonance (EPR) study of synthetic fluorapatite with 57 ± 4 ppm Gd has been made on single crystals at ~287 K. The spectra disclosed the presence of a previously unreported type of ...
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(2003)Electron paramagnetic resonance of Ir 2+ in forsterite is studied at Q-band frequency and room temperature. There are four equivalent spectra superimposed along the three crystallographic axes. The individual spectrum ...
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(2001)In this paper we report the results of electron probe X-ray microanalysis (EPMA) that was used to study environmental materials. The mode of preparation and certification of reference samples based on a basaltic glass ...
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(2003)Accessory monazites from 35 granitoid samples from the Western Carpathian basement have been analysed with the electron microprobe in an attempt to broadly constrain their formation ages, on the basis of their Th, U and ...
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(2001)Polarized electronic single crystal spectra of natural Fe2+ ion-bearing oxygen-based minerals, in which ferrous ions enter octahedral sites of different symmetry and distortion (olivine, cordierite, ortho- and clinopyroxene, ...
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(2000)Temperature, T, and pressure, P, behaviour of absorption bands caused by spin-forbidden dd-transitions of Fe3+ in octahedral sites of the andradite and epidote structures were studied at T from 300 to 750 K and P up to 10 ...
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(2003)The Fe end-members scorzalite [Fe2+ Al2 3+ (PO4)2(OH)2] and barbosalite [Fe 2+ Fe2 3+ (PO4)2(OH)2] of the lazulite series have been investigated by Mössbauer and diffuse reflectance spectroscopy, and by electronic structure ...
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(2005)Sunlight-induced reduction and dissolution of colloidal Fe-Mn (hydr)oxide minerals yields elevated concentrations of Fe2+ and Mn2+ in natural waters. Since these elements may be biolimiting micronutrients, photochemical ...
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(2002)The purpose of this article is to make an initial consideration of the physical properties of electrons trapped at classic hydrogenic lattice defects in feldspar. We are particularly interested to determine the radial ...
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(2002)Most natural feldspars contain many charged impurities, and display a range of bond angles, distributed about the ideal. These effects can lead to complications in the structure of the conduction band, giving rise to a ...
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(2001)To analyze the development of pine ecosystems on lignite and pyrite containing mine soils, four pine stands with ages of 3-35 years were investigated in a chronosequence approach. Bulk precipitation, throughfall and soil ...
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(1989)One of the fundamental problems of ocean sedimentology is finding an explanation for the mechanisms of influx of the various elements into the benthic sediments and to provide an evaluation of the importance of these ...
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(2002)The main objectives of this study were to investigate conditions for stable and metastable liquid immiscibility in dry borosilicate synthetic systems and to evaluate effects of temperature and bulk melt composition on ...
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(2002)Experiments exposing Type B calcium-, aluminum-rich inclusion (CAI)-like melts at high temperatures to high vacuum or reducing hydrogen-rich gas mixtures were used to determine the rates and consequences of elemental and ...
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(2001)It has been well established that fluids played an important part in determining chemical characteristics in many crustal terranes. Studies of fluid inclusions in eclogites have established that brines coexisted with the ...
Now showing items 3591-3610 of 21879