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Browsing ELibrary by Title
Now showing items 4578-4597 of 21934
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FORMATION DYNAMICS OF THE MIDDLE RIPHEAN RIFTOGENIC STRUTURE (WESTERN SLOPE OF THE SOUTHERN URALS) (2004)Based on the model of continental riftogenesis the Middle Riphean evolution of the study region was marked by the confinement of the maximal tension to its central part and the formation of grabens filled with coarse- to ...
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(2005)The standard enthalpy of formation of thorite and huttonite and the enthalpy of the phase transition between these polymorphs were determined using high-temperature oxide melt solution calorimetry and transposed temperature ...
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(2003)Fine-grained, angular black clasts with longest dimensions up to 800 μm were found, dispersed in a brecciated region in the Tsukuba meteorite. The clasts, much darker than the dark portions of the light-dark structure in ...
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(2004)The southwestern flank of the Baikal Rift Zone (BRZ) extends in the submeridional direction from the southern end of Lake Baikal in the east to the northern end of Lake Khubsugul in the west. It is a central depression ...
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(2004)Products of mud-volcanic activity are formed as a result of interaction between many natural factors, including dehydration of clay minerals, synthesis of hydrocarbons, evaporation, and condensation. These processes obviously ...
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(2002)Deep lithospheric roots, commonly extending to the diamond stability field, are distinctive characteristics of Archean cratons, but their origin remains controversial. The 2.7 Ga Abitibi greenstone belt initially developed ...
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(2001)Changing stresses in multi-stage caldera volcanoes were simulated in scaled analogue experiments aiming to reconstruct the mechanism(s) associated with caldera formation and the corresponding zones of structural weakness. ...
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(2004)Studies of iron-bearing silicate melt (ferrobasalt) þ iron metallicphase þ graphite þ hydrogen equilibria show that carbon andhydrogen solubilities in melts are important for the evolution of theupper mantle. In a series ...
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(2004)This study attempts to identify the astrophysical setting in which properties of the Ca,Al-rich inclusions (CAIs) found in chondritic meteorites are best understood. Importance is attached to the short time period in which ...
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(2002)Recent experimental studies have suggested that colloidal silica can form in high-T (300 to >700°C) hydrothermal fluids (Wilkinson et al., 1996). Natural evidence in support of this was found by Williamson et al. (1997) ...
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(2003)The role of aluminum and silica in the formation of colloids during granodiorite weathering was studied on the basis of long-term experiments in batch reactors. Rock samples were dissolved in un-buffered solutions of initial ...
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(2003)Zones of increased concentration formed by a solvent flowing from a source are considered. A matehmatical model for forming such zones is proposed. It takes into account that such a zone is composed of a set of independent ...
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(1996)The problem of magma intrusion through conduit walls is examined using the example of Klyuchevskoi Volcano. Magma intrusion takes place at all depths; the initial break through the wallrocks occurs mainly as a vertical ...
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(2003)Subduction of oceanic crust at an unusually low-angle has been proposed as a model for the growth of continental crust older than about 2.5 Ga. At modern zones of low-angle-, or flat-subduction, magmatic additions to new ...
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(2005)Quartz crystals from topaz–zinnwaldite–albite granites from Zinnwald (Erzgebirge, Germany) contain, in addition to primary and secondary fluid inclusions (FIs), abundant crystalline silicate-melt inclusions (MIs) with ...
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(2002)The formation of Fe(III) oxyhydroxide colloids by oxidation of Fe(II) and their subsequent aggregation to larger particles were studied in laboratory experiments with natural water from a freshwater lake and a brackish ...
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(2004)It has been suggested that Fe(II)-oxidizing photoautotrophic bacteria may have catalyzed the precipitation of an ancient class of sedimentary deposits known as Banded Iron Formations. In order to evaluate this claim, it ...
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(2004)The formation of fluorine rich magmas by fluid filtration through silicic magmas was described. Retrograde magma boiling in a large magma chamber produced an increase in pressure which resulted either in explosive ejection ...
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(2002)Agreement about planetary formation processes deteriorates sharply with distance from the Sun. While the terrestrial planets are widely believed to have formed from the collisional accumulation of solid bodies, there are ...
Now showing items 4578-4597 of 21934