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Browsing Геология России by Title
Now showing items 14050-14069 of 39124
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(2013)We present geological, structural, and geochemical data on synmetamorphic granitoids from the Tutai and South Ol’khon plutons of the Ol’khon terrane (Central Asian Fold Belt) with an estimation of the U–Pb zircon age of ...
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(2004)The study of synmetamorphic granites of the Ol'khon collisional system revealed the abundance of injection veins, dikes, and intrusions. Their emplacement was controlled by ductile strikeslips that postdate and occasionally ...
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(2001)The stratigraphic record, distribution and composition of the selachian genus Lissodus is briefly reviewed. 38 species are currently recognised, with 26 further records not designated to species level. Teeth of the genus ...
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(1989)Carbonization, a recently established new type of hydrothermal metasomatic alteration, leads to enrichment of elastic rocks in carbonaceous matter on the flanks of mineralized (primarily gold) zones, as well as in the ...
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(2002)Birnessite can be used as a precursor in the preparation of manganese oxides. Synthesis of pure birnessite is difficult because of a side reaction, which yields hausmannite. This study aimed to develop a modified ...
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(1999)A series of novel inclusion compounds with compositions of RE(HCO2)3(HNO2)(H2CO2) (RE = Y, Tb, Dy, Ho, Er, Yb, Tm) were synthesized and structures were characterized by X-ray methods. The orthorhombic structure was shown ...
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(2004)During investigations of the system Sc2O3-Al2O3-TiO2-SiO2, a new, unusual microporous compound, Cs3ScSi8O19, was synthesized as colourless plates from a CsF-MoO3 flux. The crystal structure was determined from single-crystal ...
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(2005)This paper reports the results of hydrothermal synthesis in the system Na2O-MgO-FeO-Fe2O3-SiO2-H2O. Four samples of stoichiometric magnesioriebeckite composition, ideally □Na2Mg3Fe3+2 Si8O22(OH)2, were run at 700–800 °C, ...
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(1990)The present work, we synthesized germanium-containing quartz crystals from 0.5N NaOH solutions by the thermal gradient method, at crystallization temperatures from 270° to 670°C and a pressure of 1.6 kbar. The experiments ...
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(1990)One of the unsolved problems of experimental mineralogy is the synthesis of single crystals of anadalusite. Because of the geochemical similarity of aluminum to gallium, and of silicon to germanium. This permits the use ...
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(2001)Weathered and sedimentary rocks (bauxites, clays, etc.) are promising but poorly investigated and rarely used sources of REE. These rocks are characterized by very low contents of rare-metal minerals in contrast to relatively ...
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(2004)Beryllium is a significant constituent in sapphirine in some metamorphic and pegmatitic rocks, and thus could have a major effect on its stability relationships. Using the stoichiometries of reactions involving sapphirine ...
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(2002)Beryllian sapphirine Mg4−xAl4+x[Al4+x−2yBeySi2−x+yO18]O2 has been synthesized from starting compositions with y ≤ 1 at x = 0 and y ≤ 0.5 at x = 0.5, P = 0.1–1.3 GPa, T = 700–1350 °C. Electron diffraction shows the sapphirines ...
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(2004)An O2 oxidation and freeze-dry procedure has been used to synthesize birnessite through the oxidation of Mn2+ in alkali media. The effects of O2 flow rate, the fluxion velocity of reaction suspension, the reaction temperature, ...
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(2000)Ca-tourmaline has been synthesized hydrothermally in the presence of Ca(OH)2 and CaCl2-bearing solutions of different concentration at T = 300-700 °C at a constant fluid pressure of 200 MPa in the system CaO-MgO-Al2O3-Si ...
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(2001)At 700°C and 500 MPa fullerite multilayer formations with diameters from 200 to 800 Å were synthesized from polypropylen. The diameter of the inner cavity or channel in these structures varied from 20 to 60 Å. These ...
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(2002)mm-sized crystals of enstatite were synthesized under H2O-saturated conditions at 25 kbar in a piston-cylinder apparatus. The bulk starting composition corresponded to enstatite, silica and water in the respective proportions ...
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(2001)We have produced synthetic feldspar bicrystals using a direct bonding technique. A gem-quality orthoclase crystal from Itrongay, Madagascar, was used for the bonding experiments. Microprobe analysis shows only minor ...
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(2004)Layered double hydroxides (LDHs) are known as ‘anionic clays’. They comprise a class of material with positively charged octahedral double hydroxyl layers and exchangeable anions. The Li/Al LDH term includes a group of ...
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(2004)Omphacites with varying Na/K ratio were synthesized in the system CaMgSi2O6-NaAlSi2O6-KAlSi 2O6 at pressures of 5, 6, and 7 GPa within the temperature interval 1000-1300°C. It was found that both K and Na contents of ...
Now showing items 14050-14069 of 39124