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Browsing ELibrary by Title
Now showing items 899-918 of 21934
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(1995)In order to assess the utility of dating marine, hydrogenous ferromanganese crusts with strontium isotopes, we conducted a series of leaching experiments on samples selected from several stratigraphic layers of a well-preserved ...
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(2002)The recently proposed subclass Euomphalomorpha Bandel and Fryda, 1998 was primarily based on an openly coiled, planispiral initial whorl. Here, the protoconch of Carboniferous euomphalids is described and figured in detail ...
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(1995)The use of chromous chloride reduction as a preparation technique for isolation of pyrite sulphur for isotopic analysis has been assessed. A small but consistent fractionation is introduced by reduction of pyrite to H2S, ...
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(1998)The X-ray adsorption fine structure (EXAFS) spectroscopy of antimony(III)-chloride solutions were obtained at temperatures from 25 to 250°C at pressures corresponding to the liquid-vapor equilibrium curve for H2O. Two ...
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(1999)X-ray absorption fine structure (EXAFS) measurements on 0.10-m strontium-containing solutions from 25 to 300°C at saturated vapour pressure indicate that the first shell Sr2+–oxygen (water) bond length decreases from 2.57 ...
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(1995)Sample #74459 contains 204Pb-rich zircons which, when analyzed by ion microprobe, yield U ages that are exceptionally older than their 207Pb206Pb ages. The 64 ion microprobe measurements define an age of 2681 +/- 6 Ma (1σ) ...
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(1995)A new excimer laser system for in-situ analysis of oxygen isotope ratios of silicates and oxides is described. In contrast to IR lasers the UV laser does not cause any fractionation during laser ablation due to edge or ...
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AN EXOTIC KIND OF COSMIC MATERIAL: GRAPHITE-CONTAINING XENOLITHS FROM THE KRYMKA (LL3.1) CHONDRITE (2004)Seven graphite-containing xenoliths were found in the Krymka (LL3.1) chondrite. The xenoliths have the following chemical and mineralogical characteristics which distinguish them from the Krymka host: (1) low totals in ...
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(2001)Hydrothermal experiments were performed at 100 and 200°C and at different clay:water ratios in order to investigate the transformation of smectitic layers during the alteration of a montmorillonitic starting material. This ...
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(1996)The stoichiometry and stability constants of Na-aluminate (NaAl(OH)40) ion pair were determined from both boehmite solubility and potentiometric measurements. Boehmite solubility was measured at temperatures from 125 to ...
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(2003)The mechanisms and kinetics of harzburgite reactive dissolution in basaltic liquids were examined using a combined experimental and numerical approach. Dissolution experiments were conducted at 1250–1290°C and 0.6–0.75 GPa ...
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(2004)Oxygen isotope fractionations have been determined between magnetite and water from 300 to 800°C and pressures between 10 and 215MPa. We selected three reaction pathways to investigate fractionation: (a) reaction of ...
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(1995)The fractionation of oxygen isotopes between apatite and calcite has been measured experimentally using the direct exchange technique in a piston-cylinder apparatus at high temperature and pressure (350-800°C, 1.1 GPa). ...
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(2001)The results of a study of diamond crystallisation in dry and fluid-rich dolomite-carbon systems are presented. For the dry system an induction period preceding spontaneous diamond nucleation was found of about 4 h at 7 ...
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(1996)A special experimental facility has been developed to investigate the fragmentation of vesicular magma undergoing rapid decompression. The facility operates in a regime similar to that of shock tubes and at temperatures ...
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(2003)We report results from time-series decay and sequential leaching experiments of laboratory cultured and coastal plankton to elucidate the mechanisms controlling barite formation in seawater. Batch-cultured diatoms ...
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(2004)Turbidity currents and pyroclastic density currents may originate as stratified flows or develop stratification during propagation. Analogue, density-stratified laboratory currents are described, using layers of salt ...
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(2004)The solubility and incorporation mechanisms of water in synthetic, water-saturated jadeite and Na-rich clinopyroxenes have been experimentally investigated. Infrared spectra for water-saturated jadeite synthesised from 2.0 ...
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(2002)A new experimental setup for the analysis of deformation of rock analogues is presented. The hardware component consists of a rotating polariser stage and the software component includes several specialised pieces of ...
Now showing items 899-918 of 21934