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Browsing ELibrary by Title
Now showing items 5074-5093 of 26297
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(2005)Komatiite samples from the 2.8-Ga Kostomuksha greenstone belt in the Baltic Shield define Pt–Os and Re–Os isochrons with ages of 2816 ± 190 and 2880 ± 83 Ma, respectively. The mean initial 186Os / 188Os and 187Os / 188Os ...
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(2004)The Archean bedrock of the Ukrainian Shield is divided into western and central blocks by a N–W trending tectonic zone known as the Golovanevsk suture zone. Within this zone, there are numerous mafic-ultramafic bodies ...
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(2006)Fault data from the central Apennines (Italy) were integrated with earthquake information from seismic catalogues in order to derive an empirical relation between the magnitude of the strongest historical earthquake and ...
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(2004)Dependence of concentrations of green-house gases in atmosphere on long-term variations of temperature has been considered. It is assumed that technogeneous factor plays the main role in the global warming. However, that ...
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(2006)Zinc uptake in suspensions (≤3.7 g L-1) of MX80 montmorillonite was investigated at pH 4.0 and 7.3, a total Zn concentration ([Zn]total) of 500 μM, and dissolved Si concentrations ([Si]aq) of ~70 and ~500 μM in 0.5 M NaCl, ...
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(2000)Inclusions of [Mg,Fe]O (fPc, ferropericlase, magnesiowüstite) were found in natural diamonds from several localities worldwide. fPc is typically absent from upper-mantle assemblages, but expected to be common in the lower ...
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(2006)Garnet and spinel peridotite xenoliths associated with the Phanerozoic Lambert-Amery Rift in eastern Antarctica contain evidence for several stages in the development of the mantle beneath the rift. Despite the fact that ...
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(2004)In the Transangarian region of the Yenisey Ridge in eastern Siberia (Russia), Fe- and Al-rich metapelitic schists of the Korda plate show field and petrological evidence of two superimposed metamorphic events. An early ...
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(2002)Fluctuations in Holocene atmospheric radiocarbon concentrations have been shown to be due to variations in solar activity. Analyses of both 10Be and 14C nuclides confirm that production-rate changes during the Holocene ...
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(2005)Partitioning of Ca, Mn, Mg, and Fe2+ between olivine and melt has been used to examine the influence of energetically nonequivalent nonbridging oxygen in silicate melts. Partitioning experiments were conducted at ambient ...
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(2005)Earth is the only known planet with subduction zones and plate tectonics, and this fact demonstrates that special conditions are required for this mode of planetary heat loss. Sinking of cold, dense lithosphere in subduction ...
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(2006)Iceland is the type example of a ridge-centered hotspot. It is controversial whether the seismic anomaly beneath it originates in the lower mantle or the upper mantle. Some recent studies reported that the 660-km discontinuity ...
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(1997)Re-examination of an experimental determination of the dissolution rate of reagent-grade calcite in seawater shows that the original conclusion of a rate law with 4.5-order dependence on undersaturation was very sensitive ...
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(1989)Systematic drilling recently done during prospecting surveys in various parts of the Chu-Sarysu and the Ili depressions disclosed iron-manganese mineralization in Upper Cretaceous and Paleogene continental deposits. Their ...
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(2001)The effects of thermal evolution on the composition and structure of aquatic humic substances (HS) heated at temperatures from 100°C to 500°C in presence of helium were investigated using elemental analysis, FTIR and solid ...
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(2004)Satellite images provide unique means of identifying large scale flow-generated lineations produced by former ice sheets. They can be interpreted to reconstruct the major elements which make up the integrated, large scale ...
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(1998)Microdiamonds from garnet clinopyroxenites of the Kokchetav massif (northern Kazakhstan) and associated alluvial diamonds have been investigated using infrared spectroscopy. All diamonds have high nitrogen contents (from ...
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(2004)This work presents a summary on the development of studies of historical earthquakes in Armenia and adjacent parts of Turkey and Iran. Since ancient times, this region has been an arena where active geodynamic and seismic ...
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(1990)Most authors now accept that kimberlite magmatism was confined to cratons. M.A. Kamaletdinov, Yu. I. Kazantsev and other authors have now proved that within the Ural foredeep there are thick overthrust zones. Their data ...
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(1989)Diamond-bearing kimberlites have so far been found almost entirely on cratons. In this respect, the East European epi-Karelian craton is still considered to have little potential. Nevertheless, besides placer deposits of ...
Now showing items 5074-5093 of 26297