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Browsing by Title
Now showing items 8145-8164 of 39126
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(1989)The idea of a concentrically zoned earth, consisting of a number of concentric shells, has long been established in science. But we are only beginning to realize that each shell constitutes a self-contained dynamic system. ...
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(2004)In a sedimentary environment, quasi‐layered models often can represent the actual geology more accurately than smooth minimum‐structure models. We present a 2D inversion scheme with lateral constraints and sharp boundaries ...
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(2001)On the basis of a synergetic approach, the phenomenon of layering in igneous melts is considered as a manifestation of self-organization under specific physicochemical conditions. It is assumed that plastic deformation ...
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(2003)It is shown, using the example of the Baltic large Early Paleoproterozoic igneous province of the siliceous, high-Mg (boninite-like) series (SHMS), that the layered intrusions had been intermediate-depth magma chambers ...
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(2004)Information on the structure of the upper mantle comes from two main sources. Regional seismic studies provide indirect information on large portions of the lithosphere, and mantle xenoliths provide direct information about ...
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(2004)Peridotitic clinopyroxene (cpx) and pyrope garnet xenocrysts from four kimberlite pipes in the Kaavi-Kuopio area of Eastern Finland have been studied using major and trace element geochemistry to obtain information on the ...
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(1997)The long-wavelength geoid and topography are dynamic effects of a convecting mantle. The long-wavelength geoid of the Earth is controlled by density variations in the mantle and has been explained by circulation models ...
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(2004)The experimental results obtained indicate that under certain conditions sulfide melt in fluid-bearing silicate-sulfide systems separates into a high-S Mss liquid (enriched in Fe and Ni) and a low-S liquid of Cp or Bn ...
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LAYERING OF THE EARTH AND MULTICELLULAR CONVECTION AS THE BASIS FOR A TRULY GLOBAL GEODYNAMIC MODEL (1989)The plate tectonics theory has laid the foundation for a realistic model of tectogenesis and of geodynamics in general. But we now know that this model explains more-or-less satisfactorily only the kinematics of that part ...
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(2003)The study of inactive As-bearing tailings impoundments at the Khovu-Aksy mine-site (Russia) revealed high concentrations of As in the porewater of tailings solids and in their aqueous extracts, as well as in adjacent soils. ...
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(2001)Sodium hexametaphosphate, Na6(PO3)6, is often used as a dispersant in wet grain size separation procedures to obtain the clay-sized (<0.002 mm) fraction of till and soil samples. However, the complexing properties of this ...
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(1997)By combining synchrotron X-ray standing wave (XSW) measurements with synchrotron X-ray reflectivity measurements, we have determined: (1) the precise three-dimensional location within the calcite unit cell of submonolayer ...
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(2004)Flow-through dissolution experiments were carried out on crushed granitoid rock (the Elat Granite) and three mineral separates (plagioclase, perthite, and biotite + chlorite) from this rock at pH 1 and 25°C. Major element ...
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(1993)Lead diffusion has been measured in natural titanite using two different methods to introduce the diffusant: (1) implantation of Pb ions; and (2) immersion of the crystals in a PbS powder reservoir. In both sets of ...
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LEAD GEOCHRONOLOGY OF ZIRCON BY LASERPROBE-INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY (LP-ICPMS) (1993)LaserProbe-inductively coupled plasma mass spectrometry (LP-ICPMS) provides a sensitive, fast, and simple means to determine ages in single zircon grains. A Nd:YAG laser is used to irradiate the zircon surface and leaves ...
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(2001)The isotopic composition of lead available for incorporation during metamorphic reactions is heterogeneous, depends on the reaction history of the metamorphic rock, and is commonly not accessible for measurement as the ...
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(2003)A consistent method for stable lead isotope analysis of marine carbonates and seawater is presented, utilizing multiple collector ICP-MS (MC-ICP-MS). This study presents new observations of the large (0.7% amu−1), ...
Now showing items 8145-8164 of 39126