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Browsing ELibrary by Title
Now showing items 13848-13867 of 21934
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(1999)The detection of several ultralow velocity zones (ULVZ) on the core-mantle boundary (CMB) together with the recent estimates of the lower-mantle solidus would suggest that some sort of melting may occur inside the upwellings ...
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(2002)High spatial and temporal resolution measurements of suspended sand concentration (c ) over vortex ripples were collected with a three-transducer acoustic backscatter sensor (ABS) array, under irregular `natural' waves in ...
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(2003)The aim of the study was to determine optical properties of vitrinite, subjected to temperatures within the range of 400-1200 °C for durations of 1-7 h, in an argon atmosphere. The samples of vitrinite concentrate (Vt ...
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(1999)Repeated Very Long Baseline Interferometry, VLBI, measurements exhibitautocorrelation before the baseline rates are estimated and removed from the data.Autocorrelations reduce markedly once the baseline rates are estimated. ...
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(2000)The phase diagram for lherzolite-CO2-H2O provides a framework for interpreting the distribution of phase assemblages in the upper mantle with various thermal structures, in different tectonic settings. Experiments show ...
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(2005)A compendium of diffusion measurements and their Arrhenius equations for water, carbon dioxide, sulfur, fluorine, and chlorine in silicate melts similar in composition to natural igneous rocks is presented. Water diffusion ...
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(2003)The abundances of the elements H, C, N, Ne, primordial Ar, Cl, Br, Kr, I and Xe, in the atmo-hydrosphere, continental crust and MORB-source mantle (termed the outer Earth reservoirs (OER)) are examined and compared with ...
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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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(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 ...
Now showing items 13848-13867 of 21934