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Now showing items 16657-16676 of 39004
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(1993)The platinum-group elements (PGE) are appreciably volatile in dry systems in the presence of both Cl and S at 1000°C. The present experiments were conducted in sealed silica-glass tubes, with charges of either pure metals ...
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(1997)Amphibole (n = 11), mica (n = 16), apatite (n = 9) and clinopyroxene (n = 19) from mantle xenoliths in alkali basalts from Siberia, Mongolia and Spitsbergen were analysed for Rb, Sr, Ba, Y, Zr, Nb, Th, U, Pb, La, Ce by ...
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(2003)We report noble gas and nitrogen analyses of newly discovered SNC meteorites, one nakhlite (NWA817) and four shergottites (NWA480, NWA856, NWA1068, and SaU 005). The K–Ar age (1.3 Ga) as well as the cosmic-ray exposure ...
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(1986)Abstract The structure of silicate melts on the joins SiO 2 -H 2 O, SiO 2 -Al(OH) 3 , SiO 2 -Ca(OH) 2 and SiO 2 -NaOH at high pressure and temperature has been determined with Raman spectroscopy (quenched from 1550°C at ∼ ...
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(1997)We have synthesized graphite-saturated CHO fluids at 1273K and 2.4 GPa over 7.5 orders of magnitude in fO2. Bulk H/O of the fluid ranges from 1.78 (oxidized fluids in the H2O-CO2 stability field) to 1330 (highly reduced ...
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(2002)The volatilization kinetics of single crystal α-SiC, polycrystalline β-SiC, and SiO2 (cristobalite or glass) were determined in H2-CO2, CO-CO2, and H2-CO-CO2 gas mixtures at oxygen fugacities between 1 log unit above and ...
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(1998)This paper presents the results of investigating the 1996 eruptive activity of volcanoes in the long-lived Karymsky volcanic center of Kamchatka, where eruptions began simultaneously at Karymsky volcano and in the Akademii ...
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(2004)We present the results of a regional study of oxygen and Sr-Nd-Pb isotopes of Pleistocene to Recent arc volcanism in the Kamchatka Peninsula and the Kuriles, with emphasis on the largest caldera-forming centers. The δ18O ...
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(2001)Based on the data on 26 volcanic eruptions in Kamchatka, Alaska, and the Aleutian Islands, relationships were established between the melting points of ash particles and their granulometric and elemental compositions with ...
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(2000)In order to understand the degassing behavior of heavy halogens in volcanic processes, we experimentally studied the distribution of Cl, Br, and I between albite melt and hydrous fluids containing 0.01-2 wt% of NaCl, NaBr, ...
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(2001)Limit equilibrium analyses were applied to the 1980 Mount St. Helens and 1956 Bezymianny failures in order to examine the influence on stability of structural deformation produced by cryptodome emplacement. Weakening ...
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(1997)Successive changes in the main eruptive phases and flow rate variations are analyzed for volcanoes with different characterics of magmatic systems using a numerical model for the eruption process. The main factors that ...
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(2001)The global flux of nitrogen from subduction zones is estimated by the elemental and isotopic compositions of nitrogen, argon and helium observed in volcanic gases and hydrothermal fluids in island arcs and in back-arc basin ...
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(2002)This paper proposes that gradual changes in the composition of volatiles that have been added to the atmosphere-ocean system are responsible for the Great Oxidation Event (G.O.E.) ca. 2.3 Ga. Before ca. 2.3 Ga, the composition ...
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(1987)Major slope failures are a significant degradational process at volcanoes. Slope failures and associated explosive eruptions have resulted in more than 20 000 fatalities in the past 400 years; the historic record provides ...
Now showing items 16657-16676 of 39004