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Browsing ELibrary by Title
Now showing items 9305-9324 of 21934
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(1990)Investigating the mineral composition of ferromanganese nodules is one of the most important parts of integrated study of these unique objects from the pelagic regions of oceans. The discovery of polianite attracted our ...
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(2000)The sporoderm morphology and ultrastructure of pollen grains extracted from the gut of the Early Permian insect Tillyardembia antennaeplana G. Zalessky (Grylloblattida) are studied using light and electron microscopes. The ...
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(2003)The Shtokman condensed gas deposit (CGD) is one of the largest in the world. The beginning of the development of this deposit makes it an important national economic object, which will substantially increase the techogenic ...
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(2003)This paper discusses the osmium isotopic composition of platinum group minerals (PGM)in placers related to gabbroic-ultrabasic plutons of the Polar, Nether-Polar, and Central Ural and Timan Ranges. Our isotopic data obtained ...
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(2004)This paper reviews the problems concerning the origins of trace elements in oil. A polygenetic nature of elements in naphthides is suggested from the great deal of evidence including both published and original analytical ...
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(1988)The authors attempt to calculate a phase diagram for SiO2 and estimate the range in which the high-density modifications of silica with the structure of α-PbO2 and fluorite can occur. There are several ways of calculating ...
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(2005)Several structural families reported in this book can be described by using concepts of modular crystallography (Thompson 1978; Veblen 1991; Merlino 1997; Ferraris et al. 2004). This chapter presents three groups of ...
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POLYSOMATISM AND MODULES OF GEHLENITE COMPOSITION AND STRUCTURE IN THE HANIC PHASE (Ca5Al6MgSiO17) (2001)Discrete, well-ordered, single-phase crystals (the Hanic phase) form when powders the bulk composition of Ca5Al6MgSiO17 are allowed to react in the absence of a melt. If, on the other hand, either the powders or crystals ...
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(2003)Silicon carbide (SiC) is a particularly interesting species of presolar grain because it is known to form on the order of a hundred different polytypes in the laboratory, and the formation of a particular polytype is ...
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(1993)All possible polytypes of hydrotalcite-like minerals with a periodicity along the c axis of one-, two-and three-layers, as well as the simplest six-layer polytypes, were derived on the basis of the concept of closely packed ...
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(1993)Polytype diversity of hydrotalcite-like minerals is mainly a function of the nature of the interlayer anion. Among the varieties with COl- anions, only two- and three-layer polylypes having the same structure as ...
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(1988)The new mineral was found in products of the Great Tolbachik fissure eruption, which occurred in Kamchatka in 1975 and 1976. During the eruption, this mineral was found as fine-grained brick-red incrustations on lava flows ...
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(2002)Palynodata is a comprehensive database of the occurrences of pre-Quaternary palynomorphs, encompassing over 20#000 publications. Taxa are assumed to have distributions in time and space which are localized to a region ...
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(2002)The molar volume of mixtures of CO2 and H2O is a strong function of the fluid composition. Both CO2 and H2O participate in the metamorphism of carbonate rocks, resulting in a change in the fluid composition during reaction. ...
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(2004)More than 93% of the uranium in the Schlema deposit (Erzgebirge) occurs in veins within a compositionally diverse rock unit, which are referred to as the productive series. Physicochemical reasons for the confinement of ...
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(2004)A heat exchanger was created at the French Hot Dry Rock geothermal site using a doublet of boreholes at a depth of 3600 –3800 m. After hydraulic stimulation, this exchanger was tested during a long-term circulation trial ...
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(1996)This study demonstrates that positron emission tomography (PET) and neutron radiography (NR) techniques are complementary methods for determining the fluid pathway and porosity in crystalline rock. After preliminary injection ...
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(2002)The compaction of loose sands has been tested up to high effective stresses (50MPa). More than 50 test runs were made on five different types of sands, which were of well-sorted fine- to coarse-grained, mono-quartz and ...
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(2004)The crystal structure of yuksporite, (Sr,Ba)2K4(Ca,Na)14(□,Mn,Fe){(Ti,Nb)4(O,OH)4[Si6O17]2[Si2O7]3}(H2O,OH)n, where n ~ 3 [monoclinic, P21/m, a = 7.126(3), b = 24.913(6), c = 17.075(7) Å, β = 101.89(3)°, V = 2966.4(17) Å3] ...
Now showing items 9305-9324 of 21934