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Browsing ELibrary by Title
Now showing items 6620-6639 of 21934
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(2004)Several types of fluid immiscibility may affect the evolution of volatile-rich magmatic systems at the magmatic–hydrothermal transition. The topology of silicate–salt–H2O systems implies that three-fluid immiscibility ...
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(1997)In order to define the conditions for the formation of immiscible carbonatite magmas in the lithosphere and in the crust, we have conducted phase equilibrium experiments to determine the effect of pressure and temperature ...
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(2003)Systematic analysis of phase equilibria near the liquidus of silicate-carbonate systems indicates that silicates and carbonates are structurally compatible components and should mix within broad limits when in the molten ...
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(1996)Field evidence from intrusive and effusive carbonatites supports the existence of calciocarbonatite magmas. Published experimental evidence in the model system Na2O−CaO−Al2O3−SiO2−CO2 indicated the formation of nearly pure ...
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(1997)The synthetic system Na2O–CaO–Al2O3 –SiO2 –CO2 has been widely used as a model to show possible relationships among alkalic silicate magmas, calciocarbonatites, and natrocarbonatites. The determined immiscibility between ...
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(1989)We studied the possibility that the Khibiny apatite-nepheline ores were formed from immiscible liquid phases in a system composed of 13 main components - P2O5, SiO2, TiO2, Al2O3, Re2O3, Re2O3, FeO, CaO, MgO, SrO, Na2O, K2O ...
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(1996)A local petro-hydrothermal liquid sulfur - gas - water - rock system was formed at the bottom of a thermal lake situated within the present-day ore-forming hydrothermal system of the Uzon Caldera (East Kamchatka) after a ...
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(2005)We experimentally determined the boron partitioning and boron isotope fractionation between coexisting liquid and vapor in the system H2O−NaCl−B2O3. Experiments were performed along the 400 and 450°C isotherms. Pressure ...
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(1995)Melting experiments conducted at 28 and 30 kbar on synthetic starting materials with compositions appropriate to terrestrial (depleted) and lunar mantles (undifferentiated and cumulate) show that (1) low-degree melts of ...
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(1995)Melting experiments conducted at 28 and 30 kbar on synthetic starting materials with compositions appropriate to terrestrial (depleted) and lunar mantles (undifferentiated and cumulate) show that (1) low-degree melts of ...
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(2004)We have determined the stability of rutile and karrooite on the liquidus of pseudobinary silicate melts of anorthite–diopside eutectic composition with, in addition, of up to 32wt% TiO2 at one atm total pressure and at ...
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(2004)CaO-rich, Al2O3-poor ultracalcic primitive melts occur at mid-ocean-ridges, back-arc basins, ocean islands and volcanic arcs. They are subdivided into a “nepheline-normative” alkaline-rich, silica-poor group uniquely found ...
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LITHIUM AND ITS ISOTOPES IN MAJOR WORLD RIVERS: IMPLICATIONS FOR WEATHERING AND THE OCEANIC BUDGET (1998)The outstanding problem in the lithium geochemical cycle is the lack of an isotopic mass balance in the ocean. The δ6Li compositions of fresh basalts (−4‰), the hydrothermal fluids derived from them (average −9‰), and ...
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(2003)Lithium is an important constituent in amphiboles, where it can be incorporated up to a limit of three atoms per formula unit (apfu). Lithium can partition itself between the B-group sites (where it occurs at the [6+2] ...
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(2005)The fractionation of lithium isotopes among quartz, muscovite, and a chloride-bearing aqueous fluid has been investigated experimentally at 400°–500°C and 50–100 MPa. Experiments were performed for 15–60 days in cold seal ...
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(2004)The Li isotopic composition of the upper continental crust is estimated from the analyses of well-characterized shales, loess, granites and upper crustal composites (51 samples in total) from North America, China, Europe, ...
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(2004)We determined the Li isotopic composition of coexisting olivine, clinopyroxene, and orthopyroxene from spinel- and garnet-bearing peridotite xenoliths from San Carlos (Arizona), Vitim (Siberia), Dreiser Weiher (Eifel, ...
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LITHIUM ISOTOPIC SYSTEMATICS OF THE MANTLE-DERIVED ULTRAMAFIC XENOLITHS: IMPLICATIONS FOR EM1 ORIGIN (2004)Isotopic signatures of mantle-derived xenoliths have provided much information on the evolution of their mantle source regions. A recently developed multiple-collector inductively coupled plasma mass spectrometry method ...
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(2004)The composition of Aptian–Albian rocks in the western Ciscaucasus is considered. Their lithofacies features and formation conditions are established. The data obtained can be used to determine the mineralogical potential ...
Now showing items 6620-6639 of 21934