Browsing Геология России by Title
- DSpace Home
- →
- Геология России
- →
- Browsing Геология России by Title
JavaScript is disabled for your browser. Some features of this site may not work without it.
Browsing Геология России by Title
Now showing items 14063-14082 of 39124
-
(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, ...
-
(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 ...
-
(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 ...
-
(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 ...
-
(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 ...
-
(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 ...
-
(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 ...
-
(1996)A number of experiments have been carried out using Cl-, Na-, K-, As-, Sn-, Bi-, Pb-, Te-bearing solutions at temperatures between 240 and 500°C in order to synthesize platinum-group minerals (PGM) and to study their ...
-
(1995)The synthesis of polycyclic aromatic hydrocarbons (PAHs) from benzene by shock waves was studied in order to search for a novel possibility of PAH formation under cosmochemical conditions. Shock waves generated by projectile ...
-
(1996)Some recent investigations of black shales reveal platinum-group element (PGE) concentrations in the ppm range. The low temperature nature of these mineralized sediments and their composition stimulated this first attempt ...
-
(2003)In order to evaluate the stability of Mg-Ca garnets at P = 2.5 GPa/T = 800-1500 °C, some experiments were performed using both natural and synthetic starting materials. Particular attention was paid to the investigation ...
-
(2004)Diamond was synthesized at high temperature and pressure in a Walker-style multianvil apparatus from various supercritical C-O-H rich fluid compositional systems. Depending on the type and amount of impurities added to the ...
-
(2003)We document experiments on a natural metapelite in the range 650–775°C, 6–14 kbar, 10 wt?% of added water, and 700–850°C, 4–10 kbar, no added water. Staurolite systematically formed in the fluid-present melting experiments ...
-
(1999)Thallium leucite, TlAlSi2O6, has been synthesized at 450°C for 7 days, under ambient conditions, by the transformation of dehydrated analcime NaAlSi2O6 in the presence of excess TlCl. This substitution of Tl for Na leads ...
-
(2001)Tourmaline has been synthesized hydrothermally at 200 MPa between 300 and 700 °C from oxide mixtures with Mg–Al ratios for the end members dravite NaMg3Al6(Si6O18)(BO3)3(OH)3(OH) and Mg-foitite ❏(Mg2Al)Al6 (Si6O18)(BO3)3(OH)3(OH). ...
-
(1996)Solid solutions along the magnesite-siderite join have been synthesized from mechanical mixtures of iron oxalate and basic magnesium carbonate using hydrothermal synthesis techniques at 500oC and about 2 kilobars. The ...
-
(2003)The thermochemistry of well-characterized synthetic K-H3O, Na-H3O and K-Na-H3O jarosites was investigated. These phases are solid solutions that obey Vegard's law. Electron probe microanalyses indicated lower alkali and ...
-
(2004)This work reports the synthesis of ferri-clinoholmquistite, nominally □Li2(Mg3Fe3+2)Si8O22(OH)2, at varying f O 2 conditions. Amphibole compositions were characterized by X-ray (powder and single-crystal) diffraction, ...
-
(2002)End member boromuscovite, with nearly the ideal composition, was synthesized as a single phase from mixtures of its own composition, or with excess boron and water, at high pressures of between 15 and 30 kbar at 700 °C. ...
Now showing items 14063-14082 of 39124