Browsing ELibrary by Title
- DSpace Home
- →
- Геология России
- →
- ELibrary
- →
- Browsing ELibrary by Title
JavaScript is disabled for your browser. Some features of this site may not work without it.
Browsing ELibrary by Title
Now showing items 13857-13876 of 21934
-
(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 ...
-
(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 ...
-
(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 ∼ ...
-
(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 ...
-
(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 ...
-
(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 ...
-
(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 ...
-
(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 ...
-
(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, ...
-
(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 ...
-
(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 ...
-
(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 ...
-
(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 ...
-
(2003)We address volcanic hazards in the region of the Armenian Nuclear Power Plant and discuss the assessment of these hazards conducted in the framework of the International Atomic Energy Agency (IAEA) programs in 1994–1995. ...
-
(2003)Ar/Ar dating of alkali basalt pipes and dikes of the North Minusinsk basin has provided an important chronologic framework for Altay-Sayan fold belt and Central Asia region. These Mesozoic basalt pipes have become the ...
-
(1989)An analysis of the volcanic rocks of back-arc basins indicates that the compositions of the tholeiitic basalts extruded in the spreading centers of such basins is influenced by nearby island arcs. This influence may be ...
-
(2001)The mass of sulfur dioxide (SO2) released by most explosive volcanic eruptions greatly exceeds the amount originally dissolved in the erupted volume of silicate melt. Several lines of evidence suggest that this discrepancy ...
-
(2004)Hot volcanic vents promote the thermal fixation of atmospheric N2 into biologically available forms. The importance of this process for the global nitrogen cycle is poorly understood. At Masaya volcano, Nicaragua, NO and ...
-
(2001)Mass accumulation rates (MAR) of different components of North Pacific deep-sea sediment provide detailed information about the timing of the onset of major Northern Hemisphere glaciation that occurred at 2.65Ma. An increase ...
Now showing items 13857-13876 of 21934