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Browsing ELibrary by Title
Now showing items 12386-12405 of 21936
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(2001)Chemical compositions of Au, Ag, and Sn minerals have been studied with the help of detailed electron microprobe analyses. The sequence of their crystallization has been defined more precisely. Distribution maps of native ...
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(2003)This paper shows that the 100-ka-long periodicity in the alteration of Late Pleistocene glacial and interglacial epochs was mainly controlled by the precession cycle modulation (related to the 100-ka-long eccentricity ...
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(2004)The composition, age, and geological setting is studied for the Khaldzan-Buregtei group of massifs of peralkaline rare-metal granitoids. The massifs are confined to a large fault zone separating the Late Caledonian structures ...
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(2004)The paper includes new data on alkali granites of the Khäilama massif comprising the Zashikhinskoe rare-metal deposit (Eastern Sayan) and on metasomatites of the Aryskan rare-metal deposit (northeastern Tuva) and barren ...
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(2004)It is concluded that structural position of Khibiny and Lovozero massifs was predetermined already in Precambrian Period, with formation of binucleus vortex structure upon shear deformation. Paleozoic activation of this ...
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(2004)The Khubsugul phosphate-bearing basin divided into the western and eastern zones. Phosphorites composed of alternating structureless phosphate layers (1–3 cm) and thinner lenticular dolomite laminae prevail in the western ...
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(1998)The thermal dehydration of naturally occurring Ca-montmorillonite has been studied by in situ X-ray diffraction at temperatures between 60-120 degrees C. The time-temperature-dependence of the position of the basal (001) ...
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(1998)In this study kinetic investigations were combined with X-ray Absorption Fine Structure (XAFS) measurements to determine Ni sorption processes on pyrophyllite, gibbsite, and montmorillonite over extended time periods ...
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(2002)The nucleation kinetics of binary solid solutions, with general formula BxC1-xA, crystallising from aqueous solution can be described using a generalised expression for the nucleation rate: the function, J(x), in which ...
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(2002)We report rates of oxygen exchange with bulk solution for an aqueous complex, IVGeO4Al12(OH)24(OH2)128+(aq) (GeAl12), that is similar in structure to both the IVAlO4Al12(OH)24(OH2)127+(aq) (Al13) and IVGaO4Al12(OH)24(OH2)127+(aq) ...
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(2000)Details of reactions between pyrite and water initially equilibrated with the atmosphere (pO2 = 0.2 atm and pCO2 = 10-3.5 atm) were investigated in a closed-system, batch reactor at 25°C and 37°C. The values of dissolved ...
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(2000)The dissolution of pyrite is important in the geochemical cycling of iron and sulphur, in the formation of acid mine drainage, and in the extraction of metals by bacterial leaching. Many researchers have studied the kinetics ...
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(1996)Dissolution of CaCO3 in the system H2O-CO2-CaCO3 is controlled by three rate-determining processes: The kinetics of dissolution at the mineral surface, mass transport by diffusion, and the slow kinetics of the reaction H2O ...
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(2004)The Kislaya Guba Formation studied in the Near-Imandra synform of the Late Archean Terskii-Allarechensk greenstone belt is characterized. The basal, approximately 300-m-thick horizon of the formation is composed of amphibole ...
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(2004)Sutures of various nature are very interesting for researchers and practical geologists. They are the interesting and complex geological formations arisen under conditions of compression and tension as a result of linear ...
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(2001)The Kovdor phlogopite deposit, one of the largest on Earth, occurs in the northwestern part of the Kovdor carbonatite-bearing alkaline-ultrabasic complex, Kola Peninsula, Russia. The Main phlogopite lode is situated in the ...
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(2001)The Kovdor intrusion belongs to the Paleozoic 380–360 Ma Kola alkaline and carbonatite province NW Russia . It displays a complete sequence of rocks that include in order of intrusion, ultramafic rocks, melilitolites, ...
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(1997)The article summarizes results of investigations of the Kungurian Stage for more than 100 years. Correlations inside the Cisuralian sedimentary basin, substantiation of stage and horizon boundaries, and their recognition ...
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(2001)A study of temporal relationships and a formation sequence of tin, silver-base metal, and silver-antimony ores; chemical compositions of minerals; fluid inclusions, and stable isotope (S, O, and C) ratios in minerals from ...
Now showing items 12386-12405 of 21936