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Browsing ELibrary by Title
Now showing items 3571-3590 of 21768
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(2005)Sunlight-induced reduction and dissolution of colloidal Fe-Mn (hydr)oxide minerals yields elevated concentrations of Fe2+ and Mn2+ in natural waters. Since these elements may be biolimiting micronutrients, photochemical ...
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(2002)The purpose of this article is to make an initial consideration of the physical properties of electrons trapped at classic hydrogenic lattice defects in feldspar. We are particularly interested to determine the radial ...
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(2002)Most natural feldspars contain many charged impurities, and display a range of bond angles, distributed about the ideal. These effects can lead to complications in the structure of the conduction band, giving rise to a ...
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(2001)To analyze the development of pine ecosystems on lignite and pyrite containing mine soils, four pine stands with ages of 3-35 years were investigated in a chronosequence approach. Bulk precipitation, throughfall and soil ...
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(1989)One of the fundamental problems of ocean sedimentology is finding an explanation for the mechanisms of influx of the various elements into the benthic sediments and to provide an evaluation of the importance of these ...
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(2002)The main objectives of this study were to investigate conditions for stable and metastable liquid immiscibility in dry borosilicate synthetic systems and to evaluate effects of temperature and bulk melt composition on ...
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(2002)Experiments exposing Type B calcium-, aluminum-rich inclusion (CAI)-like melts at high temperatures to high vacuum or reducing hydrogen-rich gas mixtures were used to determine the rates and consequences of elemental and ...
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(2001)It has been well established that fluids played an important part in determining chemical characteristics in many crustal terranes. Studies of fluid inclusions in eclogites have established that brines coexisted with the ...
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(1997)Isotope and trace element data from well characterised arc suites are used to identify contributions from fluids and subducted sediments in arc rocks. U-series isotopes are then used to argue that the fluid and sediment ...
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(1997)It has been established that every tenth bed of the Upper Cretaceous-Danian flysch deposits can be traced along the southern slope of the Greater Caucasus over a distance of 1035 km. This allowed 196 synchronous markers ...
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(1990)There are no data on the concentrations of elementary sulfur in Black Sea waters, and the nature of its distribution is still undetermined. In order to study elementary sulfur in the waters of the Black Sea, we developed ...
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(1988)The exogenic uranium ore deposits that tend to occur in regions where the zones of stratal oxidation (ZSO) wedge out in the water-permeable rocks of the sedimentary cover constitute a special class of mineral deposits ...
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(2003)Elevated CO2 has been shown to increase methane emissions in herbaceous wetlands, but it is not clear that this will occur in wetlands dominated by woody plants or in wetlands that are not inundated. We determined the ...
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(2001)The utility of uranium-lead isochrons for dating rocks with a restricted range in U/Pb is limited by any uncertainty in the mass fractionation of the analysis. Double spiking (TIMS) or thallium normalization (ICP-MS) remove ...
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(2001)We would like to solve the Stokes boundary-value problem taking into consideration the ellipsoidal corrections in the boundary condition in ellipsoidal coordinates The original problem, i.e., the ellipsoidal Stokes ...
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(2003)Among morphometric methods, a method called Elliptical Fourier Analysis, has been developed to decompose complex outlines into Fourier series. This elliptical Fourier formulation has been rarely applied to date, which is ...
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(1988)The consolidated crust beneath many deep downwarps on the continents is much thinner that elsewhere. Most such downwarps contain normal faults, indicating extension of the crust during subsidence. The question arises, ...
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(1999)Using the example of the Kaluga ring structure, the authors discuss the results of the hydrogen-thoron emanation survey and of the variations of the electric field of the near-Earth troposphere, caused by the ionization ...
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(2002)Emanation thermal analysis (ETA), based on radon release measurements from previously labeled samples, was used for the first time in the characterization of the thermal behavior of natural Mg2+-vermiculite (Santa Olalla, ...
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(2003)Gradual downstream fining along gravel-bed rivers is often followed by a relatively abrupt change to a sand bed. This has usually been explained by the breakdown of pebbles of certain lithologies to sand, but it is not ...
Now showing items 3571-3590 of 21768