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Browsing ELibrary by Title
Now showing items 4649-4668 of 26297
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(2002)Inclusion 101.1 from the CV3 carbonaceous chondrite Efremovka is a compact Type A Ca-Al-rich inclusion (CAI) highly enriched in ultrarefractory (UR) oxides. It is the first complete CAI with a UR rare earth element (REE) ...
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(2001)The ontogeny of five conodont species of the genus Icriodus, widespread in the Mosolovian and Chernoyarian horizons of the Eifelian of the central part of the Russian Platform, was studied. The extremes of the Icriodus ...
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(2004)Crater-ejecta correlation is an important element in the analysis of crater formation and its influence on the geological evolution. In this study, both the ejecta distribution and the internal crater development of the ...
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(2001)The polar motion prediction is computed as a least-squares extrapolation of the polar motion data. The least-squares model consists of a Chandler circle with constant or variable amplitude, annual and semiannual ellipses, ...
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(2006)Deformation models used to explain the triggering mechanism often assume pure elastic behaviour for the crust and upper mantle. In reality however, the mantle and possibly the lower crust behave viscoelastically, particularly ...
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(1998)Landau theory provides a formal basis for predicting the variations of elastic constants associated with phase transitions in minerals. These elastic constraints can show substantial anomalies as a transition point is ...
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(2006)Elastic and structural behavior of a natural cubic analcime (space group:Ia3d)from Sardinia (Italy) was investigated at high pressure by in situ single-crystal X-ray diffraction. A first-order phase transition is observed ...
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(2006)The elastic behaviour and the high-pressure structural evolution of a natural topaz, Al2.00Si1.05O4.00(OH0.26F1.75), have been investigated by means of in situ single-crystal X-ray diffraction up to 10.55(5) GPa. No phase ...
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(2003)The right-rectangular parallelepiped resonance (RPR) form of resonant ultrasound spectroscopy (RUS) is applied to monoclinic crystal symmetry to determine the 13 adiabatic elastic constants, Cij, of single-crystal ...
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(2003)The presence of clay minerals can alter the elastic behaviour of rocks significantly. Although clay minerals are common in sedimentary formations and seismic measurements are our main tools for studying subsurface lithologies, ...
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(1999)Which rule of mixture is the best for predicting the overall elastic properties ofpolyphase rocks based on the elasticities and volume fractions of their constituents? In order toaddress this question, we sintered ...
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(1998)Single-crystal elastic properties of hydrous ringwoodite are reported for samples that were synthesized at 19 GPa and 1300°C. The Mg/Si ratio is determined to be ~1.95 by EPMA, which is slightly lower than that of ideal ...
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(2006)Elastic anomalies that accompany cation ordering and displacive phase transitions can be understood in terms of coupling between strain components and the driving order parameter in Landau free energy expansions. Non-convergent ...
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(2003)Elastic properties of fluid-saturated porous media with aligned fractures can be studied using the model of fractures as linearslip interfaces in an isotropic porous background. Such a medium represents a particular case ...
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(1999)Data on elastic crustal characteristics beneath Avacha Volcano are presented. The upper crust was found to have strongly varying velocities. Zones of abnormal V(p) and high attenuation were located at various depths under ...
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(1995)Distribution coefficients for radium in heterogeneous equilibrium with gypsum and calcite were determined with solid solutions containing Ra in the mole fraction range 10-10 to 10-7 at 25 +/- 3°C. The correlation approach ...
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(1998)Using an invariant-polarization ultrasound method, we have studied the velocities of elastic waves in the gneisses and amphibolites of the second rock mass of the Archean complex of the Kola superdeep borehole (7622-9456 ...
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(2002)We present a new numerical technique for elastic wave modelling in 3D heterogeneous media with surface topography, which is called the 3D grid method in this paper. This work is an extension of the 2D grid method that ...
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(2003)Geological causes of crustal anisotropy include regional fractures and cracks, isotropic heterogeneity or layering and material composition and textural properties. In addition, shear or metamorphic foliations in fault ...
Now showing items 4649-4668 of 26297