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Browsing ELibrary by Title
Now showing items 1643-1662 of 22924
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(1994)The origin of high-amplitude lower crustal bright seismic reflections in a Phanerozoic area is investigated by modeling a distribution of metamorphic fluid flow through pores as a possible explanation. A numerical model ...
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(2001)The chemical evolution of several European Mesozoic and Tertiary evaporite basins was reconstructed by using mineral associations, primary fluid-inclusion analyses, and numerical simulations of evaporation scenarios. The ...
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(2002)Ice exhibits either ductile or brittle behavior, depending upon the conditions under which it is loaded. Glaciers, for instance, are loaded by gravity, under deviatoric stresses of ~0.1 MPa or lower. At temperatures of ...
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(2006)Volcanoes have only recently been recognized as a potentially major source of reactive bromine species to the atmosphere, following from the detection of bromine monoxide (BrO) in the plume emitted by Soufri?re Hills ...
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(2003)Calcite micro-crystals were grown from solution with single crystal dimensions up to 3 mm and doped up to ~0.1% with Nd3+ ions. Phase purity was verified by powder x-ray diffraction. The concentration of Nd3+ was measured ...
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(2001)Trials in mines have established that wideband VHF borehole radars (BHR), working in the 10-100-MHz band, can be used to probe the rockmass between boreholes over ranges from <5 m to as much as 150 m with submeter resolution. ...
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(2003)Application of an X-ray fluorescence (XRF) microprobe for the analysis of single grains (80 to 1,000 μm in diameter) of Cl-rich minerals for Br has been evaluated for fluorapatite, chlorapatite, scapolite-group minerals ...
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(2006)Evidence from laboratory experiments indicates that fractionation against the heavy stable isotope of carbon (?13C) by bryophytes (liverworts and mosses) is strongly dependent on atmospheric CO2. This physiological response ...
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BRYOZOANS OF THE GENUS DIPLOTRYPA NICHOLSON, 1879 FROM THE MIDDLE ORDOVICIAN OF THE LENINGRAD REGION (2004)The two earliest members of the genus Diplotrypa (D. olgae sp. nov. and D. catenulata Coryell, 1921) are described from the Middle Ordovician of the Leningrad Region. The diagnosis, composition, and occurrence of this genus ...
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(2004)The first records of the bryozoan genus Stomatoporopsis from the Maastrichtian of the middle Volga River region and Mangyshlak are described: S. multigemmans (Illies, 1974), S. arguta sp. nov., S. illiesae sp. nov., S. ...
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(2004)As magma rises from depth, it forms bubbles by nucleation, followed by diffusion-decompressive expansion. Expansion induces shearing, and shearing in turn causes coalescence. As the bubbles grow larger, coalescence gradually ...
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(2004)A model of bubble growth during decompression of supersaturated melt was developed in order to explore the conditions for preservation of gas overpressure in bubbles or for maintaining supersaturation of the melt. The model ...
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(1998)We examine the physics of growth of water bubbles in highly viscous melts. During the initial stages, diffusive mass transfer of water into the bubble keeps the internal pressure in the bubbles close to the initial pressure ...
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(2000)High melt viscosity is thought to hinder bubble growth in water-bearing silicate melts, and viscosities above ~109 Pa s may prevent growth and viscously quench a bubbly liquid. To investigate the influence of melt viscosity ...
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(2000)We report experimental data of bubble growth in natural rhyolitic melt with 1.4-2.0 wt% initial total H2O at 0.1 MPa and 500-600°C. Growth of many bubbles is monitored in every experiment. Bubble growth rate increases with ...
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(1996)Bubble growth controlled by mass transfer of water from hydrated rhyolitic melts at high pressures and temperatures was studied experimentally and simulated numerically. Rhyolitic melts were hydrated at 150 MPa, 780-850 ...
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(2006)Melts formed by small degrees of partial melting are rich in volatiles and may reach critical supersaturation during slow ascent or due to partial crystallization. Following nucleation, the bubbles grow and, if magma volume ...
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(2001)CO2 is relatively insoluble in basaltic magma at low crustal pressures. It therefore exists as a gas phase in the form of bubbles in shallow crustal reservoirs. Over time these bubbles may separate gravitationally from the ...
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(2005)It is the great challenge of geomicrobiology to study microorganisms in the context of their environments, both in Earth’s distant past and in the present. Planet Earth and its biosphere have evolved together, and a chronicle ...
Now showing items 1643-1662 of 22924