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Browsing ELibrary by Title
Now showing items 4630-4649 of 21934
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(2005)We found thirty compound chondrules in two CV3 carbonaceous chondrites. The abundance in each meteorite relative to single chondrules is 29/1846 (1.6%) in Allende and 1/230 (0.4%) in Axtell. We examined petrologic features, ...
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(1997)Pyrite framboid formation may be the result of four consecutive processes: (1) nucleation and growth of initial iron monosulfide microcrystals; (2) reaction of the microcrystals to greigite (Fe3S4; (3) aggregation of ...
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(2001)Rb-Sr and Sm-Nd isotopic systems were investigated in the peralkaline granitoids and comagmatic volcanic rocks, which compose the Northern Mongolia-Transbaikalia Belt (NMTB). The belt extends over more than 2000 km at a ...
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(2004)The main objective is the study of the correlation between the electric parameters of high-temperature conductivity of ultramafics pertaining to lithostructural complexes of different rock associations.
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(1987)Former diamond-bearing lherzolite consists of primary (olivine, ortho- and clinopyroxene, plagioclase, pargasite, phlogopite, ceylonite, ilmenite and sulfides) and superimposed (amphibole, calcite, phlogopite, apatite, ...
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(1989)One important aspect in studying how secondary dispersion halos and trains develop is to investigate the forms in which various chemical elements occur in them. We discuss the results of our study of the forms of gold in ...
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(2004)Groundwater flow in an unconfined aquifer (a porous layer with an open top) can be driven either by hydraulic forces, i.e. the gradient of the water table, or by differences in the density of porewater due to thermal ...
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(2004)The tailing dumps of past years may often be regarded as technogenic deposits. Chemically reactive minerals (magnesium and calcium carbonates, serpentine, and some others) can readily interact in the fine-dispersed state ...
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(1989)One method of increasing the efficiency of the prediction of gold-silver ore occurrences that supplements vertical mineralogical and geochemical zoning is analysis of the forms of occurrence of elements in ores and endogenetic ...
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(1989)In the present paper we consider the mechanism of the processes that will take place when cinnabar reacts with river water. The data obtained from physicochemical modeling indicate that mercury enters the water as a result ...
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(1989)Geochemical prospecting for ore deposits requires the identification and subsequent assessment of ore-generated multicomponent anomalies. For this purpose, the forms of occurrence of indicator elements of ore mineralization ...
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(1989)Rare alkalies are assumed to occur in igneous rocks in three main forms: 1) as isomorphous impurities in rock-forming and accessory minerals, 2) as sorbed components (atomic and molecular dispersion), 3) as submicroscopic ...
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(2000)Surfaces of natural and synthetic forsterite (Fo91 and Fo100) in aqueous solutions at 25°C were investigated using surface titrations in batch and limited residence time reactors, column filtration experiments, electrokinetic ...
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(2000)Directional dissolution along the three crystallographic axes of gem-quality olivine (Fo91), San Carlos, Arizona was studied at pH 1 and pH 2 at 23, 50, 70, and 90°C and 1 atm. The rate constant of dissolution for olivine ...
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(2004)The paper deals with numerical simulation techniques for forward and inverse modelling in multiphase (multicomponent) flow through porous media. The forward simulation software system MUFTE-UG uses recent discretization ...
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FOSSIL 26AL AND 53MN IN THE ASUKA 881394 EUCRITE: EVIDENCE OF THE EARLIEST CRUST ON ASTEROID 4 VESTA (2003)Asuka 881394 is a unique magnesian eucrite with pyroxenes that are Mg-rich like those of cumulate eucrites, but with a granulitic texture unlike the textures of cumulate eucrites. Plagioclase compositions are ~An98, and ...
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(2003)The study of fossil bacteria suggests that the character of sedimentation in ancient epicontinental basins strongly depended on the abundance of microorganisms. At present, the appearance of eukaryotes, coelomates, etc., ...
Now showing items 4630-4649 of 21934