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Browsing ELibrary by Title
Now showing items 13488-13507 of 22769
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(1987)Hydrothermal experiments on natural samples of trachyandesite and dacite bulk composition show that anhydrite (CaSO4) may occur as a stable phenocryst phase at oxygen fugacities greater than or equal to 1.0 to 1.5 log fO2 ...
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(1999)Solubility methods were employed to determine conditional equilibrium constants for the formation of hydroxide and mixed hydroxy-chloride complexes of Pd(II). Measurements were made over a temperature range of 25-85°C, a ...
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(1995)The decomposition rate of thiosulfate (S2O2-3) and the formation rates of its partial decomposition products, sulfite (SO2-3), sulfate (SO2-4), and tetrathionate (S4O2-6), were measured in the absence and presence of pyrite ...
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(1995)The theoretical minimum difference between the δ13C of soil CO2 (a concentration) and soil-respired CO2 (a flux) was previously thought to be 4.4%%. It is shown here that the difference is a function of the δ13C of ...
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(1986)A stage subdivision of the Cambrian System is proposed. In the lower series four stages are distinguished (the Tommotian, Atdabanian, Botomian, Tojohnian); in the middle series, two (the Amga and Maya stages); in the upper ...
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(2004)A fundamental challenge in modern mantle geochemistry is to link geochemical data with geological and geophysical observations. Many of the early geochemical models involved a layered mantle and the concept of geochemical ...
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(2001)This paper shows that the power spectrum of the Earth's gravity field is very well modelled by white noise signals originating at just four depths within the Earth. Being able to estimate both the lateral and the radial ...
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(2001)Information on the status and fluxes of alkali (Na, K and Rb) and alkaline-earth metals (Ba, Ca, Mg and Sr) in cultivated soils is required to predict their responses and sensitivity to acidification. The soils for this ...
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(2001)The questions of how, where and when life originated in our solar system remain largely unanswered. Some advances have been made with respect to abiotic synthesis of the key molecules deemed essential for the construction ...
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(2002)The distributions of hopanoic acids, ranging from C30 to C34, in the Messel oil shale were characterized in both the free and bound states. The bound acids were released by thermochemolysis in the presence of tetramethylammonium ...
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(2000)The term ‘sequence’ was developed in stratigraphy during the forties, but the definition was fairly vague and unpractical. A much clearer and practically applicable (but diverging) definition was developed in sedimentology ...
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(1996)Two assemblages of small mammals were identified in the Lower Miocene rocks of the Altynshokysu locality where they are confined to different stratigraphic units. The results promote more thorough correlations within the ...
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(2001)A closed set of simultaneous equations, which takes into account the relaxation properties of a medium with an internal structure, has been developed. Research was conducted on methods to control the stress state of a rock ...
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(1996)The Uralide orogen is a linear collisional belt formed during the Upper Paleozoic as a result of convergence between the East European Craton and outboard terranes, and accretion of intervening island arcs and obduction ...
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(2006)Iron-57 resonant absorption Mossbauer spectroscopy was used to describe the redox relations and structural roles of Fe3+ and Fe2+ in meta-aluminosilicate glasses. Melts were formed at 1500 °C in equilibrium with air and ...
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(1990)The structural environments of Mn2+ and Sr2+ at concentrations of 0.2–0.8 wt% in dry and hydrous silicate glasses have been studied using X-ray absorption spectroscopy (EXAFS and XANES). The environment of Mn in hydrous ...
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(2000)The results of close mapping of areas of recent thrusts in the Central Tien Shan demonstrate that they are an element of intricately built shear zones. A system of conjugate diagonal faults of NW and NE strikes which are ...
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(2004)The shear viscosities and 1 bar heat capacities of glasses and melts along the 67mol% silica isopleth in the system SiO2-Al2O3-Na2O-TiO2 have been determined in the temperature ranges 780-1140 K and 305-1090 K respectively. ...
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(1993)The Baikal rift depression, located in southeastern Siberia, is one of the best investigated intra-continental rift structures in the world. In addition to being the site of comprehensive studies by Russian geo-scientists ...
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(2003)A large amount of water is brought into the Earth’s mantle at subduction zones. Upon subduction, water is released from the subducting slab in a series of metamorphic reactions. The resulting flux into the mantle wedge ...
Now showing items 13488-13507 of 22769