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Browsing ELibrary by Title
Now showing items 2714-2733 of 22005
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(1999)Fossil biogenic apatites display rare-earth element (REE) patterns which have been proposed to reflect environmental and biological controls on past seawater composition. These patterns can be separated in two groups: (1) ...
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(1991)The isothermal (750°C) experiments of Lagache and Dujon (1987) reveal that the partitioning of Sr between plagioclase feldspar and hydrothermal solutions is a funtion of the anorthite (An) content of the plagioclase, ...
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(2001)We have analyzed the implications of [Mg](VI)double right arrow [Fe2+](VI) isomorphous substitution in the periclase structure (B1) which forms, under lithospheric P, T conditions, only very limited solid solutions with ...
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(2004)The crystal-chemistry of fifteen samples of talc from various localities and origins having a relatively wide range of Fe, Al, and F contents, have been studied mainly by Fourier-transform infrared (FTIR) spectroscopy, in ...
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(2002)Crystal–liquid equilibria, including phase relationships of minerals with silicate and/or carbonate melts, are reviewed in order to understand the occurrence of clinopyroxene with up to 2 wt.% K2O (KCpx). This mineral ...
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(2001)Sedimentary greigite (Fe3S4) can form either by ''biologically controlled'' or by ''biologically induced mineralization'' (BCM and BIM, respectively). In order to identify the origin of magnetic Fe sulfides, we studied and ...
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(2003)Spectra for certain comets show the presence of crystalline silicate dust grains believed to have been incorporated during comet formation. While grain crystallization is widely assumed to result from the thermal annealing ...
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(2004)U-type paragenesis inclusions predominate (94.7%) among the crystalline inclusion suite of 115 diamonds (−4+2 mm) obtained from the recently discovered Snap Lake/King Lake (SKL) kimberlite dyke system, Southern Slave, ...
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(2004)The swelling of organo-modified clays in organic solvents may have important consequences on bulk properties of materials based on this technology. X-ray powder diffraction was used to study the swelling of orientated films ...
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(2003)Rb-Sr and oxygen isotope studies, in addition to K-Ar isotopic determinations published previously, are reported on diagenetic and hydrothermal fundamental particles (particle thickness of 0.03 to 0.05 nm and particle ab ...
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(2001)Inclusions of mineral-forming media were studied using various techniques including X-ray spectral and ion microanalysis. Based on this study, the compositions, formation conditions (temperature and pressure), and magma ...
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(2003)Nanometric solid inclusions in diamond incorporated in garnet and zircon from felsic gneiss of the Kokchetav massif, Kazakhstan, have been examined utilizing electron microscopy and focused ion beam techniques. Host garnet ...
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(2004)Experimental data indicate that the general mechanism of Al 2SiO5 polymorph transitions is the dissolution of the unstable phase in an aqueous solution and the crystallization of the stable phase from it. The example of ...
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(1991)The equilibrium between chromite and melt has been determined on four basalts at temperatures of 1200–1400°C over a range of oxygen fugacity (fo2) and pressures of 1 atm and 10 kb. The Cr content of chromite-saturated melts ...
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(2006)Type B CAIs are subdivided into B1s, with well-developed melilite mantles, and B2s, with randomly distributed melilite. Despite intensive study, the origin of the characteristic melilite mantle of the B1s remains unclear. ...
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(1999)The Zagami meteorite is a Martian basalt which exhibits multiple lithologies formed by fractional crystallization. While the rock has been widely studied petrologically, its genesis is poorly constrained from an experimental ...
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(1987)Monoclinic pyroxenes are rock-forming minerals for a broad group of ultramafic upper mantle rocks (garnetiferous, garnet-spinel, garnet- or spinel-free, garnetilmenite, ilmenite-containing, etc.) which occur as inclusions ...
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(2002)Although the investigation of micas dates back to the pre-scientific era (see Cipriani, this volume), the idea of polytypism (originally not distinguished from “polymorphism”) in the micas did not ensue until 1934, when ...
Now showing items 2714-2733 of 22005