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Now showing items 1589-1608 of 39126
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(2001)In the system CaO-MgO-FeO-Fe2O3-TiO2-SiO2, equilibria among titanite, pyroxene(s), olivine, spinel phase, ilmenite, and quartz constrain fo2, T, aSiO2, aTiO2, aFe, and the compositional variables, μTiFe2+Fe3+-2, μCa(Mg,Fe)-1, ...
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(2004)Laboratory experiments on the branching, symbiont-bearing coral genus Porites and Acropora have been carried out to determine the dependence of the skeletal boron isotopic composition (δ11B) on the pH of seawater. The ...
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(2003)The economic evaluation of diamond-bearing kimberlites is usually carried out in four stages. Expenditure tends to increase by an order of magnitude at each successive stage. At the end of each stage, the sample results ...
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(2006)Plant litter decomposition plays a fundamental role in carbon and nitrogen cycles, provides key nutrients to the soil environment and represents a potentially large positive feedback to atmospheric CO2. However, the full ...
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(2000)Homogeneity in 41K/39K among Earth, Moon, chondrites, and achondrites has been cited as evidence that evaporation of protoplanetary dust could not have caused variability in the mass of moderately volatile elements among ...
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(2004)Accelerated biotic turnover during the Late Triassic has led to the perception of an end-Triassic mass extinction event, now regarded as one of the ‘‘big five’’ extinctions. Close examination of the fossil record reveals ...
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(1996)Though many studies on the Mg contents in the calcitic tests of foraminifers exist, the processes controlling its uptake are still a matter of debate. Laboratory cultures offer an excellent opportunity to reveal these ...
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(2001)Thermochemical sulfate reduction (TSR) is a process observed in some gas and oil reservoirs above a temperature about 120-145°C. During this process, petroleum compounds such as methane react with anhydrite to form calcite, ...
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(2003)Assessment of the glaucophane substitution, [M4]Ca + [VI]Mg ↔ [M4]Na + [VI]Al, along the Ga and F analogue of the tremolite-glaucophane join, □Ca2Mg5Si8O22F2-□Na2Mg3Ga2Si8O22F2 (= F-Ga-glauc), was conducted at 900 °C and ...
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(2001)The geoelectrical structure of the Earth's mantle is estimated to a depth of 1000 km on the basis of comprehensive use of data from magnetovariation sounding (obtained at the Ukrainian geomagnetic observatories in Korets ...
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ASSESSMENT OF DIRECT TRANSFER AND RESUSPENSION OF PARTICLES DURING TURBID FLOODS AT A KARSTIC SPRING (2003)Turbid water can be the source of important sanitary problems in karstic regions. It is the case of the Pays de Caux, in Haute Normandie, where the main resource in drinking water is provided by the chalk aquifer. In the ...
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(2003)Analytical errors calculated for individual spot 206Pb/238U measurements of zircon analyzed using high mass resolution secondary ion mass spectrometry (HR-SIMS, e.g., SHRIMP II) were assessed using natural zircon (z6266) ...
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(IOP Publishing, 2016)Groundwater quality is possible to provide under the condition of aquifers effective protection from surface contamination and bottom pollution prevention in the areas of intense oil-gas production operations. Qualitative ...
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(2001)We construct new Love and Rayleigh wave phase velocity models based on measurements made from an aspherical starting model and strict data quality control derived from cluster analyses. These new models are in good agreement ...
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(Федеральное государственное бюджетное образовательное учреждение высшего образования «Санкт-Петербургский горный университет», 2019)The article presents the results of a study on the possibility to assess refractory gold-bearing ores using thermal analysis data. It studies the flotation concentrates obtained during the enrichment of double refractory ...
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(Федеральное государственное бюджетное образовательное учреждение высшего образования «Санкт-Петербургский горный университет», 2019)The paper presents results of conducted research using regional and local methods of forecast and control over geomechanical state of the rock mass at burst-hazardous Nikolayevskoye field, located in a geodynamically active ...
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(PANGAEA, 2012-07-30)Wetlands store large amounts of carbon, and depending on their status and type, they release specific amounts of methane gas to the atmosphere. The connection between wetland type and methane emission has been investigated ...
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(2002)High-resolution gas adsorption techniques were used to analyse the evolution of the aspect ratio and adsorption energy distribution on synthetic saponite samples with increasing layer charge. Using Ar as a gaseous probe, ...
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(1999)An evaluation of early solar system chronometry by the Pb-Pb and U-Pb methods is provided. Specifically, three consequential factors are examined: procedure of age calculation, extent of terrestrial Pb contamination, and ...
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(1995)Synchrotron X-ray Fluorescence (SXRF) analysis is a nondestructive analytical technique that provides compositional information from single fluid inclusions. A protocol for conducting quantitative analyses of metal ...
Now showing items 1589-1608 of 39126