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Browsing ELibrary by Title
Now showing items 4637-4656 of 22924
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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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(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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(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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(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 ...
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(2003)Traditional mining selection methods focus on local estimates or loss functions that do not take into account the potential diversification benefits of financial risk that is unique to each location. A constrained efficient ...
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(2003)The appearance of planktonic foraminifers is the most dramatic episode in the evolution of Protozoans and an important event in the development of the biosphere during the last 400 Ma. Data on initial stages of the development ...
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(1989)Nephrite is a relatively rare product of crustal transformation of ultramafic rocks. Therefore, the finding of new nephrite-bearing provinces is of definite interest. Among the three ultramafic belts identified by G.V. ...
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(1989)A newly discovered structure on the southeastern margin of the Baltic Shield, in an area where finds of Saamian high-magnesium volcanic rocks are likely, is the Vodlozero Block, with an area of as much as 40,000 km2. In ...
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(1989)In 1985, primary sedimentary sulfates were discovered in Precambrian deposits of the Baltic Shield. The search for sedimentary sulfates was based on previous identification of the protoevaporite character of certain early ...
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(1989)The structures, the geologic positions, the petrography, and the compositions and the geochemical specializations of the ongonite, granite-porphyry, quartz-porphyry, and altered granite dikes of the Yekaterinovskiy pluton ...
Now showing items 4637-4656 of 22924