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Now showing items 5700-5719 of 39126
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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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(PANGAEA, 1987-06-18)
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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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(PANGAEA, 2012-10-25)The results of the analysis of samples of the Northern Dvina River's suspended particulate matter obtained by the sedimentation method from large water volumes in the periods of the spring high water and summer low water ...
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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., ...
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(PANGAEA, 2017-09-25)
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(2002)Key Words atmospheric CO 2 , stable carbon isotopes, leaf fossils, stomata s Abstract Developments in plant physiology since the 1980s have led to the real-ization that fossil plants archive both the isotopic composition ...
Now showing items 5700-5719 of 39126