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Browsing ELibrary by Title
Now showing items 7681-7700 of 21934
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(2005)This experimental study presents in situ measurements of step migration rates for layer growth of calcite at various levels of superaturation and fluid Sr concentrations. Our results show that Sr has complex behavior as ...
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(2004)We report, for the first time, a direct, atomic-scale characterization of Pb in zircon (4.4 3.1 Ga) from the early Archean Yilgarn craton in Australia using high-resolution HAADF-STEM. Two forms of Pb have been identified: ...
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(2002)Nanoscience and technology are not exactly new, but nevertheless rapidly expanding fields that are providing revolutions in all sciences on the scale of what genomics and proteomics have done in recent years for the ...
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(2004)Macromolecular carbonaceous material is common in primitive meteorites. Little information exists on its form and composition, and there are no published data on nanometer-scale chemical and structural variations. Transmission ...
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(2003)Lower Devonian amygdaloidal basalts in the North Minusinsk Depression contain abundant inclusions of natural solid bitumens [1-3]. Liquid hydrocarbon fluids were found in Lower Devonian rocks on the left wall of the Sokhochul ...
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(2000)The structure of the Central Pamirs is defined by piled-up large tectonic nappes, characterized by a quite definite and rather sustained sequence of stratification for the whole zone. Autochthone is represented by Early ...
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(2004)To test two hypotheses against seismology, the Orsted initial field model is used to estimate the radius of Earth's core by spectral methods. The model coefficients are used to compute the mean-square magnetic flux density ...
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(2001)Occurrences of recent native gold deposition were discovered around fumarole vents in the craters of the Northern Group of new Tolbachik volcanoes that had been born in 1975-1976. The newly deposited minerals are vertically ...
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(1989)We investigated alluvial deposits generated by the Tayezhka Brook as well as the Malaya and Bol'shaya Yukhta Brooks. The deposits lie in zones of strongly eroded igneous rock represented by sills of alkalic and alkaline-earth ...
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(1988)Rocks of the lamproite series, like kimberlites, are products of very deep processes and extreme enrichment of the upper mantle. They are now being studied far more widely because of diamond finds in lamproites of Australia. ...
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(1989)Natural finds of native silicon are not numerous. This mineral was identified tentatively by Bird and Weathers only by its X-ray diffraction characteristics in specimens of josephinite from the marginal part of the Josephine ...
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(1997)Приводятся первые данные по минералогической и температурной зональности сульфидных «труб» палеозойского «черного курильщика». Выделено четыре зоны: наружная - низкотемпературная мельниковит-пирит-марказитовая, внутренняя ...
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(1988)While studying accessory minerals in an artificial heavy mineral concentrate from the Bezymyannyy pluton, we found for the first time a pure native titanium grain. Besides native titanium, samples contained native tin, ...
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(1990)In investigating Quaternary permafrost rocks in various regions of Yakutia, we come across neogenic alumina in the form of friable white and yellowish spheres about 0.1 mm in diameter. The spherical alumina concretions ...
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(2003)The problem of the correspondence of natural and artificially stimulated radiation processes in quartz was addressed. It was shown, using the radiation accumulation of Al-O- and Ti centers as an example, that this problem ...
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(2004)Natural coarse-grained precious opal structures result from the concentration of suspensions of monodisperse silica spheres and their subsequent supramolecular crystallization at low pH values. These processes occur in ...
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(2002)Hydrous ferric oxide (HFO) colloids formed, in strictly anoxic conditions upon oxidation of Fe2+ ions adsorbed on mineral surface, were investigated under in situ conditions by contact mode atomic force microscopy (AFM). ...
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(2003)The first natural occurrence of a high-pressure polymorph of chromite has been discovered in the shock-metamorphosed Suizhou meteorite. The composition of this high-pressure polymorph is identical to that of the precursor ...
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(2003)Quantitative constraints on the rates at which metamorphic reactions proceed in nature are now available from several sources. Most common are predictions made on the basis of laboratory kinetic data. However, the applicability ...
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(2001)The main purpose of the present study is to investigate the use of natural gamma activity as a measure of geotechnical properties such as density, porosity, water content and shear strength of near surface marine sediments. ...
Now showing items 7681-7700 of 21934