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Now showing items 2155-2174 of 39066
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(1989)Geothermal oil, found in rift zones, is an indicator of vigorous geochemical, geological and biological alteration of matter. Appearances of petroleum hydrocarbons have been detected in areas of hot (315°C) brines springs ...
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(2001)The C25 highly branched alkenes which have been widely reported in coastal and deep sea marine sediments and sedimenting particles have to date only been detected in benthic diatoms. Logically, a planktonic organism would ...
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(1995)A series of novel C32-C36 polymethylhentriacontenes has been identified in near-surface sediments of the Black Sea. Hydrogenation of these components indicated that they possess the 5,8,14,24,27-pentamethyl-, 8,14,24,27- ...
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(2004)X-ray absorption spectroscopy at Ca and Na K-edges and Molecular Dynamics (MD) simulations are used to investigate the Ca and Na environment in soda lime aluminosilicate glasses. Both X-ray Absorption Near Edge Structure ...
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(2004)Based on their mineralogy and petrography, ~200 refractory inclusions studied in the unique carbonaceous chondrite, Acfer 094, can be divided into corundum-rich (0.5%), hibonite-rich (1.1%), grossite-rich (8.5%), compact ...
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(2003)The petrography and mineral chemistry of 110 Ca-, Al-rich inclusions (CAIs) and 9 Ca- and/or Al-rich amoeboid olivine aggregates (AOAs) from the Ningqiang carbonaceous chondrite are reported. These CAIs are referred to as ...
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(Минералогический музей им. А.Е. Ферсмана РАН (Москва), 2007)Изучен стронцианит из метакимберлитов трубки Зарница. По минеральным ассоциациям и изотопному составу углерода и кислорода Са-содержащий стронцианит и ассоциирующие минералы имеют метаморфогенно-гидротермальный генезис и ...
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(2003)Cadmium sorption on the hematite-electrolyte solution interface was studied in a wide range of pH and Cd2+ concentration by means of potentiometric titration and measurement of cadmium content in the solution. Computer ...
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(2002)A dated core from the profoundal zone in a pristine oligotrophic acidic lake was analyzed for Cd as well as for Al, Ca, Fe, Mg, Mn, Pb, Ti and total carbon and nitrogen. Overlying water and porewater samples were also ...
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(2003)The crystal structure of cafetite, ideally Ca[Ti2O5](H2O), (monoclinic, P21/n, a = 4.9436(15), b = 12.109(4), c = 15.911(5) Å, β = 98.937(5)°, V = 940.9(5) Å3, Z = 8) has been solved by direct methods and refined to R1 = ...
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(2003)The Jurassic/Cretaceous boundary interval in the northern hemisphere is characterized by the widespread occurrence of black shales. About 60% of all petroleum source rocks comprise sediments of late Jurassic and early ...
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(2002)Calcic cores in plagioclase of Karymsky andesite of the 1996–2000 eruptive cycle texturally and compositionally (both trace and major elements) mimic the plagioclase phenocrysts of basalt erupted 6 km away at the onset of ...
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(2000)The low-pressure eutectic for the coprecipitation of calcite, portlandite, and periclase/brucite (with H2O-rich vapor) has served as a model for the existence and crystallization of carbonatite magmas. Attempts to determine ...
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(2002)Carbonate – amphibole – clinopyroxene rocks and carbonatites from the Afrikanda complex, in the Kola Peninsula, Russia, contain a number of oxysalt minerals, including major calcite (15–95 vol.%), subordinate hydroxylapatite, ...
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(2002)A calcite - amphibole - clinopyroxene rock (CAPR) occurs as branching veins and segregations in ultramafic alkaline lithologies of the Afrikanda complex, Kola Peninsula, in Russia. The rock is composed predominantly of ...
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(2006)Sedimentary basins can contain close to 20% by volume of pore fluids commonly classified as brines. These fluids can become undersaturated with respect to calcite as a result of migration, dispersive mixing, or anthropogenic ...
Now showing items 2155-2174 of 39066