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Browsing ELibrary by Title
Now showing items 10098-10117 of 22187
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(2002)Diffusion of several rare-earth elements has been characterized in natural plagioclase under dry, 1-atm conditions. Polished or cleaved sections of feldspar were surrounded by source powders in Pt capsules and annealed in ...
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(2002)The REE distribution in fluorites as an indicator of geologic-genetic features of ore deposits related to various magmatic associations was discussed. It was found that with an increase in the distance between the ...
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(2001)The unique Li-bearing metasomatic deposit formed in the outer contact of the Etyka Ta-bearing amazonite granite massif was studied. The metasomatites were formed in the pregranite and syngrahite stages. The pregranite stage ...
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(2001)Very few studies deal with REE (rare earth element) mobility within the system soil-soil solution-streamwater. In this article, we try to characterize the fractionation and the migration of the REE in a granite-derived ...
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(2003)The study of the geochemistry of rare-earth and trace elements in calcic amphibole from the Nyurundukan mafic complex, northwestern Baikal region, showed that their abundance and distribution depend on the grade of ...
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(2002)Analyses of REE were conducted on phosphatic concretions and various types of associated organic matter in eight, key latest Neoproterozoic–earliest Cambrian, inner- to outer-shelf, marine phosphatic successions that are ...
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(1987)Rare earth element (REE) patterns of plutonic rocks across the Cretaceous Peninsular Ranges batholith vary systematically west to east, transverse to its long axis and structural trends and generally parallel to asymmetries ...
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(2001)The adsorption experiments of rare-earth elements (REE) onto δ-MnO2 and Fe oxyhydroxide precipitates suspended in aqueous NaCl solutions have been conducted. The distribution coefficients, Kd(REE: precipitate/solution) ...
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(2000)This is a report of the first unambiguous discovery of rare earth elements (REE) in iron sulfide (FeS) in an ordinary chondrite. The content and the pattern of REE as well as the reduced state of the chondrules with the ...
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(1998)Carbonatites from the Khibina Alkaline Massif (360–380 Ma), Kola Peninsula, Russia, contain one of the most diverse assemblages of REE minerals described thus far from carbonatites and provide an excellent opportunity to ...
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(2002)A newly compiled global reef database indicates that the 5–6 Myr long Frasnian (Late Devonian) metazoan reef episode had relatively low diversity compared to Middle Devonian highs (with over 200 genera of calcitic rugose ...
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(2001)In this study we focus on precise lead isotope analysis by thermal ionization mass spectrometry (TIMS) with silica gel technique. We present extensive measurements of SRM981 and SRM982 standards, of chemically pure Pb and ...
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(2002)The paper presents the results of long-term complex investigation of lacustrine and fluvial-lacustrine sediments in the Baturino coal quarry (Chelyabinsk district, south Transurals region). Three units, the Chumlyak (lower ...
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(1999)A reference section of the Upper Permian deposits of the Tethyan basin in southeastern Mongolia is defined. The brachiopod zonation of the deposits is described. Two zones corresponding to one transgressive phase are united ...
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(1999)Materials of geological, paleontological (small mammals and freshwater mollusks), paleopedological, palynological, paleomagnetic and magnetic studies are considered to characterize the Log Krasnyi loess-and-soil formation ...
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(2000)This paper describes an effort in developing reference systems to be used in high temperature subcritical and supercritical aqueous solutions for assessing the viability and accuracy of high-temperature pH sensors. Each ...
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(2004)The aim of this paper is to determine a relationship between the wavenumbers of the first OH-stretching overtones (W2OH) and the wavenumbers of the OH-stretching fundamentals (WOH) to help to interpret the near-infrared ...
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(1997)A large and representative collection of clay-size dioctahedral mica minerals differing in their chemical compositions has been studied by infrared (IR) spectroscopy in the OH stretching vibration region. Decomposition of ...
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(1997)A new model for the interpretation of dioctahedral mica infrared (IR) spectra in the OH stretching vibration region is proposed. It is based on the analysis of the main factors responsible for the observed sequence of the ...
Now showing items 10098-10117 of 22187