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Browsing ELibrary by Title
Now showing items 2793-2812 of 21253
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(2001)A new model is proposed for passive degassing from sub-volcanic magma chambers. The water content in stably stratified shallow magma chamber will be equated to its solubility at the upper boundary by convection. Water from ...
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(2004)Changes in the concentrations of atmospheric greenhouse gases constitute an important part of global climate forcing. Here we present the first continental evidence for climatically caused changes in a methane gas hydrate ...
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(2002)A series of microcosm experiments was conducted to examine the influence of different mixing processes on algal lipid degradation in surficial sediments. The experiments simulated 3 different mixing regimes: bioturbated, ...
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(2001)Zircon crystallized from felsic magmas typically (if not ubiquitously) develop compositional growth zonation that is easily imaged by cathodoluminescence (CL). This zonation represents inherently unstable chemical gradients ...
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(2003)The dehydration, iron oxidation, and diffusion of radiogenic argon (40Arr) on heating in air at 373-1273 K were studied for sericites from sericite schists hosting the Katsdag and Filizchai deposits of the Belokan-Shekin ...
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(2004)The dehydration-rehydration process in boggsite |K0.06Na0.36Sr0.01Ca7.00Mg1.20Fe0.05(H2O)70| [Al17.52Si78.62O192]-BOG, a rare natural pentasil zeolite characterized by a 3D channel system of 10- and 12-rings, occurs in ...
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(2004)The structural changes of synthetic buserites (10Å phases), hydrous phyllomanganates, have been studied as a function of exchangeable interlayer cations and the relative humidity (RH) at which the sample is equilibrated. ...
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(2002)The stepwise dehydration process of the Ba-exchanged form of the zeolite phillipsite was studied by in situ synchrotron X-ray powder diffraction. A series of structure refinements were performed using the Rietveld method ...
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(2004)The thermal dehydration process of the natural Li zeolite bikitaite has been studied in situ by synchrotron radiation powder diffraction. The temperature-resolved experiments were performed using a translating imaging plate ...
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(1995)We report the results of partial melting experiments between 8 and 32 kbar, on four natural amphibolites representative of metamorphosed Archean tholeiite (greenstone), high-alumina basalt, low-potassium tholeiite and ...
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(2005)The dehydration behavior of a natural stilbite sample from Poona (India) was investigated by in situ FTIR. The thermal induced variations of the water molecule bending (ν2) mode around 1653 cm−1, the stretching (ν3 and ν1) ...
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(2002)Cordierite precursors were prepared by a sol-gel process using tetraethoxysilane, aluminum sec.-butoxide, and Mg metal flakes as starting materials. The precursors were treated by 15-h heating steps in intervals of 100 °C ...
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(1995)We performed vapor-absent melting and crystallization experiments on two bulk compositions that model metamorphic rocks containing a single hydrous phase: a biotite gneiss [37% bio (mg-number 55), 34% qtz, 27% plg (An38), ...
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DEHYDROXYLATION AND CO2 INCORPORATION IN ANNEALED MICA (SERICITE): AN INFRARED SPECTROSCOPIC STUDY (2005)Dehydroxylation and incorporation of CO2 in mica (sericite-2M1) during high-temperature annealing has been investigated in detail using infrared (IR) spectroscopy. The dehydroxylation is characterized by a dramatic change ...
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(2002)The thermally-induced dehydroxylation and transformations of the 2:1 phyllosilicate pyrophyllite have been studied using infrared spectroscopy in the frequency range 350 11000 cm 1 and the temperature range 200 1500°C. ...
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(2000)Celadonite and glauconite samples heated at different temperatures were studied by X-ray and electron diffraction. For dioctahedral micas the in-plane component of the translation between layers (ccosβ/a), which is strongly ...
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(2000)The quantitative interpretation of the reflection intensities of the SAED patterns of glauconites reveals the mechanism of migration of the octahedral sheet cations during heating up to 750°C. It confirms that Mg2+ has a ...
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(2002)The thermal conductivity of mantle materials decreases with higher temperatures and increases with greater pressure due to phonon mechanism, but increases with temperature for radiative transfer. This trade-off attribute ...
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(2000)Recent numerical models and analog shock tube experiments show that disequilibrium degassing during magma ascent may lead to violent vesiculation very near the surface. In this study a series of decompression experiments ...
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(2003)The marine fill of ancient foreland basins is primarily recorded by depositional systems consisting of facies and facies associations deposited by a variety of sediment gravity flows in shallow-marine, slope and basinal ...
Now showing items 2793-2812 of 21253