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Browsing ELibrary by Title
Now showing items 8490-8509 of 21936
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(2002)Sectored vesuvianite showing optically triclinic properties was studied by X-ray and P-FTIR analyses, and the origins of the internal optical texture are discussed. A monoclinic refinement (space group P2/n) suggests that ...
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(2001)Polarized optical absorption spectra of three synthetic Co-bearing silicates, orthopyroxene, olivine and beryl, were studied at room and liquid nitrogen temperatures. In all three matrices, Co enters octahedral structural ...
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(2001)Polarized optical absorption spectra of a rare Fe2+, Fe3+-bearing silicate mineral, tuhualite, (Na,K)2Fe22+Fe23+Si12O30, were measured at room temperature in the range 350–4000 nm (ca. 28500–2500 cm–1). The spectra display ...
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(1999)Conventional lead isotope ratio measurements by thermal ionization mass spectrometry (TIMS) are currently limited to external precisions of ~0.1% (2σ) due to variations in instrumental mass discrimination, the magnitude ...
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(1990)Recent new theory and numerical methods of mathematical statistics, which require large amounts of computation, avoid most of the a priori probabilistic assumptions and lead to statistical results that can be obtained by ...
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(1989)The existing methods for the disaggregation of sandy-clayey rocks (SCR) in a frozen or thawed state, which are used in the preparation of rock mass for mining, are based on the action of two mutually exclusive forces which ...
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(2004)The interpretation of stable isotope values hinges on precise, accurate estimates of kinetic isotope effects (α), which are equal to 1k/2k, where 1k and 2k are the reaction rate constants for the two isotopes. Kinetic ...
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(2003)When designing an experiment, the aim is usually to find the design which minimizes expected post-experimental uncertainties on the model parameters. Classical methods for experimental design are shown to fail in nonlinear ...
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(1997)For isotope-ratio analyses of Sr and Nd whose precisions are constrained by amplifier and ion-counting noise, significant improvements in efficiency/precision can be realized by appropriate choices of peak vs. background ...
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(2004)I will consider mainly geothermobarometry in medium-grade pelitic rocks, including the garnet-biotite (GB) geothermometer, the Grossular-Al silicate-plagioclase (GASP) geobarometer, and the muscovitealmandine- biotite-sillimanite ...
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(2002)Building reservoir models consistent with production data and prior geological knowledge is usually carried out through the minimization of an objective function. Such optimization problems are nonlinear and may be difficult ...
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(1997)An internally consistent set of standard state and mixing properties has been derived for olivine, orthopyroxene, garnet, cordierite, and ilmenite in the system FeO-MgO-CaO-Al2O3-TiO2-SiO2-H2O from analysis of relevant ...
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(1997)Internally consistent thermodynamic data for endmembers and solid solutions derived in Part I of this work are used to predict phase relationships and compositions of solid solutions in good agreement with direct experimental ...
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(2004)Dense profile-oriented resistivity data allows for 2D and 3D inversions. However, huge amounts of data make it practically impossible to do full 2D or 3D inversions on a routine basis. Therefore, a number of approximations ...
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(2001)Often in practice, when generating seismic waves on a line, even with a wide-band source, numerous natural and technical obstacles cause a low resolution of reflection seismograms. In this case, the economy of the survey ...
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(1997)Astronomers have little confidence in orbital forcing calculations on time scales beyond ten million years. They are confident that the fundamental frequencies of the planetary orbits remain nearly constant on time scales ...
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ORBITAL TUNING AND CORRELATION OF 1.7 M.Y. OF CONTINUOUS CARBON STORAGE IN AN EARLY MIOCENE PEATLAND (2004)Peatland is an important terrestrial carbon reservoir that contains >25% of soil carbon and accounts for 25% 38% of natural methane emissions. Most of this carbon is contained in postglacial boreal peat. Our understanding ...
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(2004)Breccias in the crater floor of large impact structures are pseudotachylites (sensu largo), authigenic monomict and polymict clastic-matrix breccias, so-called footwall breccias, and impact melt breccias. Pseudotachylite ...
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(2001)Some recent works dealing with the concept of order-disorder in clay minerals are considered, including those aspects of order-disorder which appeared in the Brindley & Brown (1980) monograph, i.e. disorder in the distribution ...
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(2000)Cation ordering is often one of the most efficient ways a mineral can adapt to changing temperature or chemical composition. Disorder of distinct species across different crystallographic sites at high temperature provides ...
Now showing items 8490-8509 of 21936