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Browsing ELibrary by Title
Now showing items 3074-3093 of 21936
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(2004)The large differences in He and Ar diffusivities in silicate minerals could result in fractionation of the He/Ar ratio during melting of the mantle, producing He/Ar ratios in the primary mantle melts that are higher than ...
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(2002)We have developed a numerical model to investigate the importance of diffusive chemical fractionation during production and transport of melt in Earth’s upper mantle. The model incorporates new experimental data on the ...
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(2006)U-series radioactive disequilibria in basaltic lavas have been used to infer many important aspects of melt generation and extraction processes in Earth’s mantle and crust, including the porosity of the melting zone, the ...
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(2002)A new technique for imaging convection in the outer core is presented, which is based on mean field electrodynamics. The method assumes a frozen magnetic flux balance for the global-scale part of the fluid velocity in the ...
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(2002)Diffusion through `wetted' grain boundaries is often the rate limiting process during rock deformation by intergranular pressure solution. However, the underlying processes operative within such boundaries are poorly ...
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(1995)Diffusional characteristics of two biologically active surface sediments were determined by use of a combined N2O-O2 microsensor. By analyzing changes in the N2O-gradients in these sediments, it was possible to determine ...
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(1996)Chemical diffusivities approximating tracer diffusivities of Sr, Nd, and Pb have been measured in a natural rhyolite melt at 1.0 GPa and temperatures from 1000 to 1450°C using the diffusion couple technique. Diffusivities ...
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(2004)An algorithm, Determination of Earth Surface Structures (DEST), is presented to reconstruct digital terrain models of complex landforms from topographic data, such as contour lines and spot heights. The algorithm provides ...
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(2003)Three techniques of digital photogrammetry have been applied successfully to laboratory analogue models to study surface displacements caused by various volcano deformation types. Firstly, side-perspective videos are used ...
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(2001)Image analysis of lacustrine sediments has become a useful method in paleolimnology, since correlation between grey-scale and different climate and sediment proxies has turned out to be very promising. Based on experiences ...
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(2002)A much-discussed topic in seismology deals with how and under which loading conditions soil shows nonlinear behavior and how this can be verified from seismograms. Seismologists have been seriously searching for signatures ...
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(1989)To understand the role of internal sources, it is useful to distinguish between large- and small-scale (in terms of deformation) fluctuations. The large-scale fluctuations appear to result directly from the release of ...
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(2001)Based on a dye tracer experiment in a sand tank we addressed the problem of local dispersion of conservative tracers in the unsaturated zone. The sand bedding was designed to have a defined spatial heterogeneity with a ...
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(2004)The Brovar’s condition of minimizing the Earth’s anomalous gravity field focused to the determination of the parameters of the Earth’s mean ellipsoid has been discussed and applied in two modified and simplified versions. ...
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(2002)The surface water of the marine environment has traditionally been viewed as a nitrogen (N) limited habitat, and this has guided the development of conceptual biogeochemical models focusing largely on the reservoir of ...
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(2001)The occurrence and distribution of dinoflagellate cysts in surface sediments from the Laptev Sea shelf and the adjacent continental margin have been studied in relation to surface water conditions. Assemblages were interpreted ...
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(2002)Seismic profiles and mollusks have been used to suggest that from ∼12 500 to 7000 yr BP, the Black Sea was an isolated freshwater lake containing potable water and implying a surface salinity of <1. According to Ryan and ...
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(1995)Eucrite, howardite, and diogenite members of the achondrite meteorites are considered by many to be genetically related. Therefore, each provides a piece of the puzzle for reconstructing magmatic processes on the eucrite ...
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(1998)Dissolution experiments of diopside and anthophyllite were conducted in continuously stirred flow-through reactors at temperatures of 25° and 90°C at acid pH. Stoichiometric steady state was reached at # 2700 h (at 25°) ...
Now showing items 3074-3093 of 21936