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Browsing Геология России by Title
Now showing items 3849-3868 of 39126
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(2002)Different approaches (American and European) to perfection of the General stratigraphic scale (GSS) are discussed. Practice of the International Stratigraphic Commission that consists, according to recommendations of ...
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(2002)The dynamics of dissolved organic matter (DOM) are closely related to organic matter processes such as decomposition, humification, and stabilization of organic matter in soils. Nevertheless, it is unknown whether dissolved ...
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(2006)This study investigates the extent of post-depositional alteration of δD values of n-alkyl lipids, isoprenoids, and kerogen isolated from a continuous 450 m core that covers the transition from thermally immature to early ...
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(2000)The compositional dependence of water incorporation mechanisms in melts and glasses belonging to the quartz (Qz)-albite (Ab) join was studied with nuclear magnetic resonance (NMR) spectroscopy. Dry and hydrous glasses ...
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(2000)The investigation of prehistoric human migration from the measurement of Sr-isotope ratios within preserved tissue is critically dependent on the preservation of biogenic Sr. A number of recent studies have involved isotope ...
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(1997)Synchrotron-based X-ray absorption fine structure (XAFS) spectroscopy was used to investigate the reduction of aqueous Cr(VI) to Cr(III) in magnetite-bearing soils from Cr-contaminated sites. Soils from two field sites ...
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(2003)Western, central, and eastern segments of the Trans Alai mountain front in the northern Pamir of Kyrgyzstan have accommodated varying degrees of approachment of the Pamir orogen with respect to the Tien Shan (Shan = ...
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(1997)We present a study of the noble gas isotopic abundances in two achondrites, Divnoe and the Asuka 881371 angrite. For Divnoe, we also performed chemical analyses of the major elements and of some minor and trace elements ...
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(2004)Many studies of foreland basins have recognized a hierarchical organization in the stacking of sequences deposited by axial-deltaic and alluvial fan systems. The hierarchy is often explained in terms of the competing control ...
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(1998)Data on Jurassic foraminifers from key localities in continents and oceans is analyzed. Their distribution range spans the stratigraphic interval from the Aalenian to the Tithonian equal to 32 million years. Among 23 ...
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(1986)Although layered komatiite flows with spinifex-textured upper parts and olivine-enriched lower parts are commonly thought to provide firm evidence of magmatic differentiation by olivine settling, there are reasons to suspect ...
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(1989)Estimates of the change in composition of magmas being intruded (proceeding from the composition of the resulting rocks) consider the change in chemical and mineral compositions of successive phases of emplacement (first, ...
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(2001)The geologic section of the widely known Pechenga intrusions with accompanying nickeliferous mineralization consists of the following three principal zones (listed in order from bottom to top): wehrlite, clinopyroxenite, ...
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(2004)Diffractions always need more advertising. It is true that conventional seismic processing and migration are usually successful in using specular reflections to estimate subsurface velocities and reconstruct the geometry ...
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(1999)Previo us investigations of goethite revealed a substantial variation of color and diffuse reflec- tance spectxa (DRS) in the extended visible range (350-2200 nm). To better understand the causes of this variability and ...
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(2002)Electrical conductivity of lherzolite (65% olivine), measured as a function of time after changes in the oxygen fugacity (fo2) of the surrounding CO2/CO atmosphere, is used to infer the diffusivity of the point defects ...
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(1999)The commonly used expression of the closure temperature, TC, of a diffusing species in a mineral, as derived by M.H. Dodson [Contrib. Mineral. Petrol. 40 (1973) 259-264], is applicable only to systems which have undergone ...
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(2004)The process of diffusion of fluid in porous media and biological membranes has usually been modelled with Darcy's constitutive equation, which states that the flux is proportional to the pressure gradient. However, when ...
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(1996)Self diffusion coefficients of calcium (DCa), aluminum (DAl), silicon (DSi), and oxygen (DO) were measured in molten CaO-Al2O3-SiO2 at 1500oC and 1 GPa over a range of melt compositions, using the isotope tracer method. ...
Now showing items 3849-3868 of 39126