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Browsing ELibrary by Title
Now showing items 5341-5360 of 21936
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(2005)Garnet-facies continental mantle is poorly understood because the vast majority of mantle xenoliths in continental basalts are spinel peridotite. Peridotite xenoliths from Vitim (southern Siberia) and Mongolia provide some ...
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(1998)The similarity of the Lu-Hf and Sm-Nd isotope system during most mantle differentiation processes makes the combination of 176Hf/177Hf and 143Nd/144Nd a very sensitive indicator of a select number of processes. This paper ...
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(2000)Three ordinary chondrites, Forest Vale (H4), Ste. Marguerite (H4) and Richardton (H5) have been studied with 182Hf-182W system (t1/2=9 million years [m.y.]) in order to provide constraints on the initial 182Hf/180Hf for ...
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(2001)We report the first Sm-Nd and Rb-Sr isotopic analyses of silicate inclusions in four IIE iron meteorites: Miles, Weekeroo Station A and B, and Watson. We also report the Hf-W isotopic composition of a silicate inclusion ...
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(2002)We have constrained the residence of high field strength elements (Nb, Ta, Zr, Hf, Ti) in metasomatised peridotite xenoliths in basalts from SE Siberia using high-precision electron-microprobe analyses of accessory Ti-rich ...
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(1989)Detailed stratigraphic schemes of the Upper Cretaceous sediments in the Caucasus allowed us to identify the presence of hiatuses and intraformational erosion surfaces based on the omission of one or another stratigraphic ...
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(1990)Recent progress in the theory and methods of geomechanics has led to a clear understanding of previously unknown properties of the rock medium, particularly its block structure and structural hierarchy. The new theory holds ...
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(1988)The structure of the stress field is studied around a frictional shear fault on the basis of a theoretical solution. The hierarchical properties of tectonic stress fields are discussed. A method is proposed for the separation ...
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(1989)The pattern of relationships between characteristics scales in the earth's structure discovered by M.A. Sadovskiy and analyzed in his publications pointed the way for a new line of geophysical research. An interesting ...
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(1995)Using an iron hydroxide precipitation to concentrate the rare earth elements it was possible to obtain precise Nd isotopic data on ultramafic rocks. Four samples of unserpentinized harzburgite from the Voykar ophiolite, ...
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(2003)Boron is a typical lithophile element characterized by a significant accumulation in the Earth's crust (15 ppm) relative to the primitive mantle (0.6 ppm) [1]. In magmatic systems, boron behaves as an incompatible element ...
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(1998)Both (reduced) type I and (oxidized) type II chondrules from the primitive chondrites Allende, Semarkona, and Bishunpur, were analysed with ion microprobe for the carbon and hydrogen concentrations of their silicates. The ...
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(2001)Diffuse emissions of CO2 are known to be large around some volcanoes and hydrothermal areas. Accumulation-chamber measurements of CO2 flux are increasingly used to estimate the total magmatic or metamorphic CO2 released ...
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(1998)Surface analysis by X-ray photoelectron spectroscopy (XPS) in combination with Ar etching was performed on a lunar regolith sample from the Luna 16 drill-core. The sample contains only ~10% of glass spherules; these are ...
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(1999)Large isotopic deviations of 149Sm-150Sm and 157Gd-158Gd derived from neutron capture effects were observed in five enstatite achondrites (aubrites); Norton County, ALH78113, Cumberland Falls, Bishopville and Mayo Belwa. ...
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HIGH GROUNDWATER NITRATE CONCENTRATIONS INHIBIT EUTROPHICATION OF SULPHATE-RICH FRESHWATER WETLANDS (2004)During the last 60 years, pollution of the groundwater with NO3- has greatly increased in many parts of Europe, as a consequence of excessive use of manure and synthetic fertilisers. Monitoring of groundwater-fed wetlands ...
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(2004)This special issue developed partly from the open PAGES conference held in Moscow in May 2002. The dominant theme of the present collection of articles is the Late Pleistocene and Holocene paleoenvironmental history of ...
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(2003)A new sequence of axisymmetrical spherical mantle convection simulations has been computed to monitor the influence of mantle avalanches on the mantle thermal state. During an avalanche that is characterized by a high rate ...
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(2002)The concentrations of all rare earth elements (REE: La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu) in silicate glass, apatite and zircon were measured by an ion microprobe method with a high mass resolving power ...
Now showing items 5341-5360 of 21936