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Browsing ELibrary by Title
Now showing items 11851-11870 of 21934
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(2000)In this paper we present a new approach to the problem of the crystallisation in solid solution-aqueous solution (SS-AS) systems, in which two main controlling factors have been considered: (i) the supersaturation state ...
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(2004)Sphalerites and sulfides in selected reaction assemblages of the Cu–Fe–Zn–S, Cu–Fe–S, and Fe–Zn–S systems were crystallized in molten salt fluxes contained in evacuated capsules at temperatures between ∼250 and ∼535 °C. ...
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(1995)A new calculation of the crustal composition is based on the proportions of upper crust (UC) to felsic lower crust (FLC) to mafic lower crust (MLC) of about 1:0.6:0.4. These proportions are derived from a 3000 km long ...
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(1997)The Earth's core is an alloy of iron and a light element such as sulphur, oxygen or silicon. Starting with static equations of state of Fe, Fe3Si, Fe7S, Fe3S and FeS, calculated from density functional theory, we can ...
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(2003)Zircon is the main mineral in the majority of igneous and metamorphic rocks with Zr as an essential structural constituent. It is a host for significant fractions of the whole-rock abundance of U, Th, Hf, and the REE (Sawka ...
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(2000)Sodic amphiboles in high pressure and ultra-high pressure (UHP) metamorphic rocks are complex solid solutions in the system Na2O–MgO–Al2O3–SiO2–H2O (NMASH) whose compositions vary with pressure and temperature. We conducted ...
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(1993)We have experimentally determined the compositions of near-solidus melts from depleted natural lherzolite at pressures greater than 25 kbar. The melts are carbonatitic with low alkali contents and Ca/(Ca + Mg) ratios of ...
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(2003)Glacier storage is a widely used term, applied to different processes and time-scales by different disciplines in hydrology and glaciology. We identify that storage occurs as ice, snow, and water associated with three ...
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(2001)This paper reviews modern aspects of studying the sea surface microlayer (SSM). Some problems of SSM formation, physical stability, and chemical composition are discussed in the first section. Natural components and ...
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(2004)The geochemical behaviors of V and Sc during partial melting are more similar to each other than to most other elements but, in detail, the partitioning of V is redox-sensitive whereas that of Sc is not. The V/Sc ratio in ...
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(1998)Volcanic gases have contributed to the development of the Earth's atmosphere to a large extent. Today, the sulfur budget of the atmosphere is still much influenced by volcanic degassing. Even though the total flux of sulfur ...
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(1997)The pressure evolution of a cooling and crystallising body of magma stored in the crust is sensitive to the depth and vertical extent of the chamber and also to the volatile content of the magma. In shallow sill-like ...
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(2002)Measurements of the Li isotopic compositions of lavas from magmatic arcs worldwide suggest common processes at work that lead to the retention of isotopically heavy Li in the mantle. Samples from this study derive from the ...
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(2001)Resurgent doming consists of the uplift, usually accompanied by volcanic activity, of part of a collapse caldera. Analogue models were used to investigate the architecture of resurgent domes. Dry sand simulates the brittle ...
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(2003)Biodegradation rates in oilfields have been assessed conservatively using whole oil-column minimum rate estimates, diffusion-controlled oil column compositional gradient modelling and mixed oil kinetic models. Biodegradation ...
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(1993)Isotopic age investigations have been carried out on samples from the late Pliocene Eldzhurtinskiy granite (Great Caucasus, Russia) in order to elucidate the cooling history of this kilometere sized plutonic body. The ...
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(2005)A suite of experiments was performed to investigate the partitioning of Sr2+ (to mimic the radionuclide 90Sr) between calcite and artificial groundwater in response to the hydrolysis of urea (ureolysis) by Bacillus pasteurii ...
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(2001)The core has often been suggested as a source for He presently found in the mantle. If the core served as the long-term storage reservoir for He in ocean island basalts with distinctively high 3He/4He ratios, then the ...
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(1999)Correlations between mean annual temperature (MAT) and the weighted average oxygen isotope composition of yearly precipitation (δ18Opt) are well-known, but the utility of modern relations to make reliable estimates of ...
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(1999)A major disadvantage of the electron microprobe is its inability to determine Li, which may make up an essential component in micaceous minerals. Correct classification of micas and proper calculation of their formulae ...
Now showing items 11851-11870 of 21934