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Browsing ELibrary by Title
Now showing items 3378-3397 of 21821
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(2001)A sequence of peat enriched with impact ejecta (allochthonous minerals and iridium) from Piila bog, 6 km away from the Kaali impact crater (island of Saaremaa, Estonia), was examined using pollen, radiocarbon, loss-on-ignition, ...
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(2004)Sedimentary sections from Lake Baikal in Siberia and Lake Hovsgol in Mongolia show that during the Last Glacial Maximum (LGM), planktonic/benthic diatoms, chrysophyte cysts, sponge spicules and zooplankton remains did not ...
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(2001)The Quaternary, the last and shortest period of geological history that is still in progress, is unique in many respects. Quaternary mineral resources are considered here as a constituent of the Quaternary environments. ...
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(1999)Anthropogenic hydrogeochemical anomalies are specified in the Kola region. Their development is related to direct discharges and runoffs of mining and metallurgical activity and the indirect effects of element leaching by ...
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(2000)The new mineral species edgarite, FeNb3S6, was discovered in a feldspar-rich fenite, in a fenitized xenolith enclosed by nepheline syenite of the Khibina alkaline complex, Kola Peninsula, northwestern Russia. It occurs as ...
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(1998)We consider a series of simple calculations with a step-function change in thickness of the lithosphere and imposed, far-field boundary conditions to illustrate the influence of the lithosphere on mantle flow. We consider ...
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(2003)Functional, constructional, and preservational criteria led to a reinterpretation of seemingly complex trace fossils and the majority of assumed metazoan body fossils from Vendian lagerstatten. In the new scenario, Ediacaran ...
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EDIACARIAN SPONGE SPICULE CLUSTERS FROM SOUTHWESTERN MONGOLIA AND THE ORIGINS OF THE CAMBRIAN FAUNA (1997)Carbon and strontium isotopic data are used to show that the earliest sponge spicule clusters and associated phosphatic sediments (with Anabarites) from southwestern Mongolia are of Ediacarian age. Spicule morphologies ...
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(2004)High-resolution pollen records from the northern alpine foreland are used to evaluate the patterns of climate change during the period between the late Eemian Interglacial (marine oxygen isotope stage OIS 5e) about 115 ky ...
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(1988)We analyze the convective stability of a system consisting of two infinite horizontal layers separated by a contact boundary which in the case of hydrostatic equilibrium is planar and is located at a fixed depth. The layers ...
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EFFECT OF ACID AND ALKALI TREATMENTS ON SURFACE AREAS AND ADSORPTION ENERGIES OF SELECTED MINERALS (2002)Bentonite, biotite, illite, kaolin, vermiculite and zeolite were acidified or alkalized with hydrochloric acid or sodium hydroxide at concentrations of 0.1, 1.0 and 5.0 mole dm 3 at room temperature for two weeks. In acid ...
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(2002)Bentonite, biotite, illite, kaolin, vermiculite and zeolite were treated with 0.1, 1.0 and 5.0 mol. dm-3 HCl or NaOH. Suspensions of Na homoionic forms of the initial and the treated minerals were back titrated with 0.1 ...
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(1987)The paper reports on a study to determine the temperature and the composition at the invariant point in the system Ab-Ort as a function of HCl concentration in the aqueous fluid at Ptot = Pfl = = 1 kb. The procedure resembled ...
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(2004)An accurate 3D numerical model of the acoustic-gravity wave (AGW) excitation before an earthquake is proposed and linear plasma response in F region of the ionosphere is studied. It is shown that “reactive modes” of AGW ...
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(2000)The sessile drop method has been used for measurements of the surface tension of haplogranite (HPG) melts containing an excess of alkalis and phosphorous (HPG8, HPG8 + 5 wt% Li2O, 5 wt% Na2O, 20 wt% Na2O, 5 wt% K2O, 5 wt% ...
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(2004)The investigation of hydrous boro(alumino)silicate melts and glasses with near infrared (NIR) spectroscopy revealed an important effect of boron on the water speciation. In the NIR spectra of B-bearing glasses new ...
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(1988)We studied a series of cadmium tetrahedrites, relatively high in silver, from the Ushkatyn-III barite-lead-zinc deposit in the Atasu district in central Kazakhstan. Their chemical composition was determined with the electron ...
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(1995)Mineral magnetic properties of soils and parent materials have been interpreted in terms of paleoclimate and rates of soil formation but it is important to understand which minerals contribute to the mineral magnetic signal. ...
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(2002)Two samples of pure kaolinite with a significant difference in their crystallinity, a commercial kaolin sample with 20 wt.% of illitic component and one sample of illitic clay with up to 20 wt.% of kaolinitic component ...
Now showing items 3378-3397 of 21821