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Now showing items 5703-5722 of 39124
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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 ...
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(2002)Micro-Raman spectroscopic analysis allows us to estimate the internal pressure of small fluid inclusions. We applied this method to CO2-dominated fluid inclusions in mantle-derived xenoliths. The pressures estimated from ...
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(1998)Fossil roots Radicites sukhonensis sp. nov. and R. erraticus sp. nov are described from the Upper Tatarian Substage in the basin of Sukhona and Malaya Severnaya Dvina rivers. Fossil roots are assigned to five distinct ...
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(2001)The suborder Paratrichoptera (Mecoptera) is discarded as polyphyletic. The family Choristopsychidae Mart. is synonymized under Permochoristidae Till. The generic composition of the family Mesopsychidae Till. is revised. ...
Now showing items 5703-5722 of 39124