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Browsing ELibrary by Title
Now showing items 13848-13867 of 21879
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(1989)An analysis of the volcanic rocks of back-arc basins indicates that the compositions of the tholeiitic basalts extruded in the spreading centers of such basins is influenced by nearby island arcs. This influence may be ...
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(2001)The mass of sulfur dioxide (SO2) released by most explosive volcanic eruptions greatly exceeds the amount originally dissolved in the erupted volume of silicate melt. Several lines of evidence suggest that this discrepancy ...
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(2004)Hot volcanic vents promote the thermal fixation of atmospheric N2 into biologically available forms. The importance of this process for the global nitrogen cycle is poorly understood. At Masaya volcano, Nicaragua, NO and ...
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(2001)Mass accumulation rates (MAR) of different components of North Pacific deep-sea sediment provide detailed information about the timing of the onset of major Northern Hemisphere glaciation that occurred at 2.65Ma. An increase ...
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(1989)Recent work has shown that high-temperature hydrothermal activity in the rift structure of the East Pacific Rise (EPR) is concentrated within individual segments and occurs in zones extending along it for as far as several ...
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(1998)We review recent developments in the study of volcanism and tectonics on Venus. Venus's crust is basaltic, dry, and probably about 30 km thick. The mantle con-vects, giving rise to plumes, and has a similar composition and ...
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(2005)The laser 40Ar/39Ar dating technique has been applied to five Luna 16 basalt fragments and one impact glass, and nine Luna 24 basalt fragments and one breccia. The textures of these basalts are fine-grained ophitic and ...
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(2002)In terms of their detailed volcanology and facies architecture, continental flood basalts and associated volcanic rifted margins reveal important information to help our understanding of their evolution. Mafic volcanism, ...
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(2001)Volcano-tectonic depressions and domes from the North-Kamchatka-Koryakskii and Central Kamchatka volcanic belts are described in terms of their structure, geophysical expression, and mineralization.
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(1989)The authors have developed a method of deep geoelectric investigation using the 800-kV Volgograd-Donbass DC power line and have developed a set of programs for automated data processing and preliminary interpretation. Area ...
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(2001)The volume change associated with dehydration melting has been investigated experimentally in muscovite and biotite-bearing assemblages because it is a possible driving force for melt segregation during orogenesis. Experiments ...
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(1994)Predictions of molar volume, excess molar volume, and isochoric P-T trajectories from thirteen published equations of state are compared with one another and with preliminary volumetric data for CO2-CH4-N2 fluids at 200°C ...
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(1999)An instrument and results of experiments on dynamical phenomena in gravitation are described. A preliminary interpretation is presented, and some inferences are offered concerning an analogy between dynamic gravitation and ...
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(2001)The crystal structure of the mineral vulcanite, CuTe [a = 3.155(1), b = 4.092(1), c = 6.956(1) A; Z = 2; space group: Pmmn, No. 59] exhibits a pronounced layer structure with Te-Te distances between the CuTe layers of ...
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(2000)The decay of the short-lived isotope 182Hf to the isotope 182W early in solar system history provides clues to the origin and evolution of the Earth and Moon. Current time-scales for the formation of proto-planets in the ...
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(1997)A new hydrous silicate phase with formula Mg1.71Fe0.177Al0.01Si0.965H0.332O4 has been synthesized at 1400°C and 17.5 GPa from a hydrous iron-rich mantle peridotite composition. The space group is Imma and unit cell parametersa ...
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(2005)The crystal structure of the rare mineral wakabayashilite was solved by direct methods using intensity data collected from a twinned crystal. This study revealed that, in spite of the strong hexagonal pseudosymmetry, the ...
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(2001)Products of the hydrothermal alteration of rocks and vertical zonality at the Kanimansur silver-polymetallic deposit (Tadjikistan) have been studied. On the basis of these studies, physicocochemical conditions of metasomatism ...
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(2002)The problem of the existence of a Tethys circumglobal current (TCC) in the Late Cretaceous continental geometry (Campanian) is addressed. Within an ocean model which is expected to strongly overestimate the wind-driven TCC ...
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(2003)Crystals of natron, Na2CO3·10H2O, were grown by slow evaporation of a saturated sodium carbonate solution at room temperature. A single-crystal fragment was measured on a CCD X-ray four-circle diffractometer at 110, 270 ...
Now showing items 13848-13867 of 21879