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Browsing ELibrary by Title
Now showing items 4650-4669 of 21768
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(2004)The paper presents new data on the structure and composition of the Vendian-Early Cambrian oceanic crust of the Paleo-Asian ocean, which has been fragmentally preserved in Early Cambrian accretionary prisms of Gorny Altai. ...
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(2004)The Altai-Salair area in southern Siberia is a Caledonian folded area containing fragments of Vendian–Early Cambrian island arcs. In the Vendian–Early Cambrian, an extended system of island arcs existed near the Paleo-Asian ...
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(1988)Characteristic features of Late Cenozoic volcanics fringing the Komandor Basin, Bering Sea, are the lateral compositional inhomogeneity, expressed in their enrichment in high-charge lithophile and light rare-earth elements, ...
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(2004)Detailed geological, geochemical and biostratigraphic studies of rocks from basaltic-sedimentary terranes in the Kurai and Katun accretionary wedges (Vendian-Middle Cambrian units), the Charysh-Terekta strike-slip zone ...
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(2000)Pyrite framboids have been synthesised as the product of the oxidation of FeS (mackinawite) by H2S in aqueous solutions at pH 6, Eh > -250 mV and temperatures above 60°C in the absence of detectable O2. Under these conditions ...
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(2003)The three piston cores, collected from the East Sea, were analyzed to detect changes of sedimentary environment during the late Quaternary. The cores consist mainly of muddy sediments that are interbedded with silty sands, ...
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(1989)Ore consisting primarily of francolite and groutite was found in Siberia in an ultramafic pluton consisting of alkalic rock and carbonatites. Groutite has not previously been reported in carbonatite complexes; the hand-books ...
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(1989)The Vishnevogorisk alkalic complex in the Urals is one of the mineralogically best studied complexes of such rocks in the USSR. More than 200 minerals (plus varieties) are now known here. In 1986, while studying mineralized ...
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(2001)The first records of Frasnian Rugosa from Mongolia are discussed, including Nicholsoniella golovtshenkoae sp. nov., N. hurenensis sp. nov., Aulacophyllum exiguum sp. nov. and Temnophyllum ruzhentsevi sp. nov.
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(2002)We derive a 3D Frechet sensitivity kernel relating the rms amplitude of a far-field, broad-band body-wave pulse to laterally heterogeneous seismic slowness variations within the earth. Unlike the 'banana-doughnut' sensitivity ...
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(2002)The combination of TMAH thermochemolysis and TEAAc treatment makes it possible to discriminate between the different forms of mono- and dicarboxylic acids present in the structure of humin and humic acids, that is, ''free'' ...
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(2001)The rate of growth of Earth's continental crust is commonly estimated from the age distribution of present continental crust and from the geochemistry of ancient mantle-derived lavas. In this paper, I assess the rate of ...
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FREQUENCY-DEPENDENT SEISMIC ATTENUATION IN THE INNER CORE 2. A SCATTERING AND FABRIC INTERPRETATION (2002)Broadband velocity waveforms of PKIKP in the distance range 150-180° are inverted for a model of inner core attenuation due to forward scattering by a three-dimensional heterogeneous fabric. A mean velocity perturbation ...
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(2004)A migration algorithm based on the least-squares formulation will find the correct reflector amplitudes if proper migration weights are applied. The migration weights can be viewed as a pre-conditioner for a gradient-based ...
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(2000)Freshwater chlorophycean algae are characteristic organic-walled microfossils in recent coastal and shelf sediments from the Beaufort, Laptev and Kara seas (Arctic Ocean). The persistent occurrence of the chlorophycean ...
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(2003)The microstructure of a quartzite experimentally deformed and partially recrystallised at 900 °C, 1.2 GPa confining pressure and strain rate 10-6/s was investigated using orientation contrast and electron backscatter ...
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(2002)Graphical displays were used early in geophysics and crystallography, mineralogy, petrology and structural geology by the early 1800s, but nineteenth-century geology obstinately remained mainly descriptive. Charles Lyell's ...
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(2003)Over the past 25 years there has been a growing body of evidence based on petrologic, remote sensing, and volcanic gas data that andesitic, dacitic, and rhyolitic magmas in crustal reservoirs are saturated with a multicomponent ...
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(2000)Metal enrichment to ore grade is the ultimate outgrowth of large-scale and long-term fractionation processes of the thermally driven and unique water-cooled geological evolution of the Earth. Silicic magmatism along ...
Now showing items 4650-4669 of 21768