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Browsing ELibrary by Title
Now showing items 4236-4255 of 21934
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(2003)Recent seismological studies have presented evidence for the existence of a layer with ultra-low seismic velocities at the core–mantle boundary at ca. 2900 km depth. We report high-amplitude, high-frequency, and laterally ...
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(2004)The explosions of Karymsky volcano often produce signals containing a sequence of repeating pulses recorded on acoustic and seismic sensors, known as chugging. The amplitudes of these pulses correlate with the time interval ...
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(2004)Extensional cataclasites in the albitite-uranium deposits of the Ukrainian Shield are spatially and genetically related to sodium metasomatism. They formed within the long-lived Middle Proterozoic fault zones owing to fluid ...
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(2003)The objective of this study was to discern the source of higher than usual concentrations of chloride in drainage water collected from experimental forest plots after clear-cutting. When the sandbox experiments were initiated ...
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(2001)The compositionally typical H5 chondrite St-Robert has an exposure age, 7.8 Ma, indistinguishable from that of the main cluster of H chondrites. Small values of the cosmogenic 22Ne/21Ne ratio in interior samples imply a ...
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(2003)Exsolution and coarsening in Fe-free clinopyroxene of composition En45.1Di54.9 was studied at temperatures of 1300, 1200, and 1100°C, and annealing times between 10 min and 4320 h. Based on the wavelength of the exsolution ...
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(1993)Eclogite xenoliths from the mantle have experienced a wide variety of processes and P-T conditions, many of which are recorded in the mineral compositions and textures. Exsolution of garnet from clinopyroxene is one such ...
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(1997)To understand Cl dissolution in aluminosilicate liquids and the exsolution of Cl-rich magmatic volatile phases, experiments were conducted to determine the solubility of NaCl, KCl, and H2O in felsic liquids at 0.5 and 2 ...
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(1995)In oils and Precambrian- to Miocene-age source rocks from varying depositional environments, we have conclusively identified several novel 3-alkyl sterane and triaromatic steroid series, including (1) 3β-n-pentyl steranes, ...
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(2001)In this paper we demonstrate application of the Extended Self-Similarity (ESS) concept, recently developed in turbulence physics, for geological and geophysical phenomena. The theoretical background is discussed first and ...
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(2000)We have studied with an aspect-ratio four box the thermal–chemical convective evolution with strongly temperature- and depth-dependent viscosity and moving heat sources within the extended-Boussinesq framework, in which ...
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(2004)A new model of the quiet-time, near-Earth magnetic field has been derived using a comprehensive approach, which includes not only POGO and Magsat satellite data, but also data from the Orsted and CHAMP satellites. The ...
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(2001)A new technique that uses multicollector plasma-ionization mass spectrometry (MC-ICP-MS) for the determination of Ag isotopic composition is reported. By correcting for instrument-induced mass fractionation of Ag by ...
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(1987)Extensional processes predominate in the system of island arcs and marginal seas as confirmed by complexes of parallel dikes in the corresponding paleostructures and by seismic and other data in present-day marginal seas ...
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(2004)DaG 896 is an olivine-rich microporphyritic rock of komatiitic composition. Both the olivine composition (Fa17.5±2.1, [Mn/Mg] = 0.0061) and the bulk oxygen isotopic composition (δ O = +2.55, δ O = +3.50) indicate that DaG ...
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(1999)Organic matter loading in continental margin sediments frequently occurs at a concentration equivalent to a monolayer coating of mineral grains, raising the question of whether adsorbed organic matter is indeed dispersed ...
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(2002)One aspect of the inherent disorder in silicate glasses and melts is the intermixing among framework units, which has important implications to the macroscopic properties of silicate magmas. We present experimental evidence ...
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(2003)We have found clear evidence of live 10Be in five normal Type A Calcium-aluminum-rich inclusions (CAIs), one normal Type B CAI, and one FUN Type A CAI, all from CV3 chondrites. The (10Be/9Be)0 ratios range from ∼0.36 × ...
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(2003)The geological history of the families Platanaceae and Hamamelidaceae is studied on the basis of original fossil material and available literature. The evolutionary stages of morphological and taxonomic diversity are ...
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(2003)We present estimates of ''realizable'' influx of selected cosmogenic isotopes, 3He, 10Be, 26Al, and 14C, and platinum group elements, Ir, Os, and Re on the earth via influx of meteoroids. We define realizable as the ...
Now showing items 4236-4255 of 21934