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Browsing ELibrary by Title
Now showing items 5660-5679 of 26297
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(2002)The Hadean Earth (before c. 4 Ga) was abiotic, possibly steering a bumpy course between brief periods of hot inferno after meteorite impacts, and long episodes of Norse icehell. The earliest Archaean life would probably ...
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(2004)Mineralogical and crystal-chemical descriptions are provided for two end-members of the new Group 5 introduced by Leake et al. (2004) in the nomenclature of amphiboles. This new classification scheme recognizes the occurrence ...
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(2002)Ferriallanite-(Ce), ideally CaCeFe3+AlFe2+(SiO4 (Si2O7)O(OH), is the analogue of allanite-(Ce) with Fe3+ dominant in the octahedral site M(1). It is of metasomatic origin and occurs in an alkaline granitic pegmatite of ...
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(2001)The crystal structure of ferrian winchite (□0.87K0.13)∑1.00 (Ca0.65Na1.34)∑1.99 (Mg2.78Fe2+0.12 Mn0.07Ti0.01)∑2.98 (Fe2+0.88Fe3+0.92 Al0.20)∑2.00 (Si7.88Al0.12)∑8.00 O22 ((OH)1.77F0.23)∑2.00, a 9.8339(2), b 18.0357(2), c ...
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(2006)The bulk Fe2O3 contents and inter-mineral distributions of Fe3+ were investigated in a suite of samples from several orogenic lherzolite massifs, including Beni Bousera (Morocco), Ronda (Spain) and Lherz (France). Ferric ...
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(2001)Seventy-five K2O-FeO-Fe2O3-SiO2 liquids were equilibrated in air between 1123°C and 1596°C. The bulk compositions of the quenched glasses range from 35 to 85 wt.% SiO2, 3 to 41 wt.% Fe2O3, 0 to 5 wt.% FeO, and 11 to 34 ...
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(1996)Several experimentally-based, empirical calibrations of the fO2 of natural silicate melts at atmospheric pressure as a function of melt composition, melt Fe2+/Fe3+, and crystallization temperature have been developed ...
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(2000)Although the electron microprobe has become the standard microanalytical tool in modern geosciences, conventional electron microprobe analysis does not allow determination of the valence states of elements such as Fe. The ...
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(2004)Experiments on compositions along the join MgO–NaA3+Si2O6 (A=Al, Cr, Fe3+) show that sodium can be incorporated into ferropericlase at upper mantle pressures in amounts commonly found in natural diamond inclusions. These ...
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(1997)A suite of picroilmenite megacrysts from the Dalnaya kimberlite, Siberia, was found to fall into one of two groups, the most abundant having 11-12 wt% MgO and 650-1500 ppm Nb, and the others having lower MgO (8.8-10.2 wt%) ...
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(2001)Pink nanofibers were extracted from rose quartz from 29 different pegmatitic and massive vein localities throughout the world. Their width varied from 0.1 to 0.5 μm. On the basis of optical absorption spectra of the fibers ...
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(2001)The new variational statement is suggested for the elliptical equations systems describing behavior of structurally-inhomogeneous media. The statement is implemented in the form of a calculation algorithm. The inverse ...
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(2006)Snow entrainment alters the speed and hence the run-out distance of avalanches, yet little is known about this significant process. We studied entrainment in snow avalanches using observations from (1) the Swiss Vallée de ...
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(2002)A design of a dewatering system is necessary for site improvement prior to the construction of some structures. The design of an efficient dewatering system requires estimating the value of the in-situ coefficient of ...
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FIEST FIND OF ACCESSORY DIAMONDS IN DRUSITIC ECLOGITES OF SOME OPHIOLITE COMPLEXES IN TRANSBAIKALIA (1989)Most banded ophiolite complexes contain rocks with eclogite or eclogite-like parageneses. These include various mineralogical varieties of eclogite and eclogite-like rocks, glaucophane and eclogite-glaucophane schists, as ...
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(2004)Filatovite, ideally K((Al,Zn)2(As,Si)2O8), has been found in products of fumarolic activity on the second cinder cone of the North breach of the great fissure Tolbachik eruption (1975-76, Kamchatka peninsula, Russia). The ...
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(2006)Multiple-point simulation, as opposed to simulation one point at a time, operates at the pattern level using a priori structural information. To reduce the dimensionality of the space of patterns we propose a multi-point ...
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(2001)Magmatic inclusions were studied in phenocrysts from the high-alumina basalts of Klyuchevskoy Volcano, with special emphasis on melt inclusions in olivine (Fo 71-79), clinopyroxene (Mg# = 70-81), and plagioclase (An 47-84) ...
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(2004)Field and isotopic evidence suggests the following sequence of metamorphic events for the Tanaélv belt, as determined at the Yavrozero area. The peak of high-temperature amphibolite (and, presumably, granulite) metamorphism ...
Now showing items 5660-5679 of 26297