Browsing ELibrary by Title
- DSpace Home
- →
- Геология России
- →
- ELibrary
- →
- Browsing ELibrary by Title
JavaScript is disabled for your browser. Some features of this site may not work without it.
Browsing ELibrary by Title
Now showing items 6897-6916 of 21936
-
(2003)Late Cenozoic alkaline basic volcanics in the Baikal Rift Zone and adjacent territories of eastern Siberia and central Mongolia are relatively small in volume. However, the geochemical and isotopic signatures indicate that ...
-
(1991)Magnetic reversal frequency correlates inversely with mantle plume activity for the past 150 Ma, as measured by the volume production rate of oceanic plateaus, seamount chains, and continental flood basalts. This inverse ...
-
(2000)We have employed an axisymmetric, spherical shell model with the two major phase transitions and variable viscosity to study the dynamical processes associated with both regular mantle plumes and superplumes, which can ...
-
(2005)Mantle preconditioning may be defined as the extraction of small melt fractions from mantle asthenosphere during its flow to the site of magma generation. Equations may be written for mantle preconditioning, assuming that ...
-
(2001)Inferences on the rheology of the mantle based on theoretical and experimental rate equations for steady state creep are discussed and compared with results from geophysical models. The radial increase of viscosity by one ...
-
(2001)The paper presents results of the investigation of the major-, trace-, and rare-earth element compositions of kimberlites from various regions of the Yakutian diamond-bearing province with application to determining mantle ...
-
(2002)The origin of the Baikal rift zone (BRZ) has been debated between the advocates of passive and active rifting since the 1970s. A re-assessment of the relevant geological and geophysical data from Russian and international ...
-
(2001)We examine the effects of non-uniform rheology and melting models on the 3D structure of mantle upwelling beneath spreading centers. Our numerical models identify a range of conditions for which 3D upwelling can be considered ...
-
(2004)Two direct search methods, simulated annealing and neighbourhood algorithm, are applied to the inversion of the viscosity profile of the mantle using relative sea level time-histories for the Hudson Bay region. In problems ...
-
(2003)We applied data on kimberlite-hosted mantle xenoliths from Lahtojoki, Kaavi, in eastern Finland for thermal, rheological and seismic velocity modeling of the lithospheric mantle in the central part of the Fennoscandian ...
-
(2003)The application of phase equilibrium methods to the estimation of oxygen fugacity (fO2) showed that the present-day lithospheric and asthenospheric upper mantle layers are moderately oxidized. Their fO 2 values fall above ...
-
(2004)Compatible deformation between the upper crust and upper mantle is documented for a variety of ancient and neotectonic settings, suggesting that these lithospheric layers are coupled. Areas of neotectonic deformation are ...
-
(2003)The primary objective of this work was an examination of the complimentary roles of tensile damage and confinement reduction (or stress relaxation) on excavation response of "hard" rockmasses. Tensile damage and relaxation ...
-
(1999)The estimation of the seismically dangerous zones of Kamchatkaand Greece for the nearest years is given in this report on the basis of joint application of MEE (Map of expected earthquakes) algorithm and of RTL prognostic ...
-
(2001)Offsite movement of waterborne agrochemicals is increasingly targeted as a non-point source of water quality degradation. Our research has indicated that subsurface water movement is variable and site-specific, and that a ...
-
(2000)We present an algorithm to identify and remove quarry explosions from earthquake catalogs while retaining a maximum amount of data. For most seismicity studies, quarry blasts are a data contamination that obscures natural ...
-
(2002)Fractured and altered zones within a granitic pluton are mapped in three dimensions by means of high resolution seismic traveltime tomography. The input traveltimes were picked from offset and azimuth variable vertical ...
-
(1987)This paper presents new data on the characteristics of the absorption field for short-period transverse waves in the upper mantle of the region. Traces obtained at fixed and temporary stations of the Multidisciplinary ...
-
(2000)The major-element composition of a grain of peridotitic Cr-pyrope garnet, coupled with a temperature estimate (TNi) derived from its Ni content, can be used to calculate the forsterite (Fo) content (100Mg/(Mg+Fe)) of the ...
-
(2001)Ground-penetrating radar (GPR) is used to both image and quantify porosity variations in a variably welded pyroclastic flow deposit. Characteristic radar signals for nonwelded (constant, high porosity) and welded (porosity ...
Now showing items 6897-6916 of 21936