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Browsing ELibrary by Title
Now showing items 12571-12590 of 21253
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THE RELATIONSHIP BETWEEN STRATIGRAPHIC DISTRIBUTION OF MAGNESITES AND DEVELOPMENT OF CYANOBACTERIA (2004)A biochemogenic mechanism is proposed for the formation of magnesite. During photosynthesis, cyanobacteria and, sometimes, other autotrophs consumed CO2 dissolved in water; thus, they increased the pH value of the medium. ...
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(1996)On the basis of different proportions and chemical compositions of shield and post-shield magmas, three types of oceanic intraplate volcanism appear to exist. The average SiO2 contents of primitive melts of most Pacific ...
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(2003)Instantaneous velocity gradients within the continental lithosphere are often related to the tectonic driving forces. This relationship is direct if the forces are secular, as for the case of loading of a locked section ...
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THE RELATIONSHIP OF RECENT VERTICAL MOVEMENTS TO THE MORPHOSTRUCTURAL PATTERN OF THE KAZAKH SHIELD (1992)The geodetic data on recent vertical crustal movements within the Kazakh shields is in good correlation with its development in the Holocene (according to a study of juvenile river terraces); they point to gradual transition ...
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(2004)Joint fractography in European plutons frequently shows large fringe-tilt angles connected to small fringe-crack twist angles (type A). In contrast to this first type, fringes of joints that tilt at small angles out of the ...
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(2004)A suite of 22 members of the heterophyllosilicate astrophyllite-group from SiO 2 -over-and undersaturated igneous rocks were studied by single-crystal X-ray diffraction, wave-length dispersive electron microscopy and room ...
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(1999)The sulfur contents at sulfide saturation (SCSS) of a basaltic and a picritic melt have been measured experimentally as a function of pressure and temperature from 5 to 90 kb and 1400-1800°C, using piston-cylinder and ...
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(2002)We performed a systematic high-precision secondary ion mass spectrometry 26Al-26Mg isotopic study for 11 ferromagnesian chondrules from the highly unequilibrated ordinary chondrite Bishunpur (LL3.1). The chondrules are ...
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(2001)The Re–Os (rhenium–osmium) chronometer applied to molybdenite (MoS2) is now demonstrated to be remarkably robust, surviving intense deformation and high-grade thermal metamorphism. Successful dating of molybdenite is ...
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(2002)The project “Volgaforest” was focused on a study of the water budget of the forested Upper Volga catchment in Russia in order to describe:•the terrestrial water balance of the Upper Volga catchment as a function of external ...
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(1999)Formation of secondary Ni precipitates is an important mechanism of Ni retention in neutral and alkaline clay/water systems. However, the structure and composition of these secondary phases, and their stability is still ...
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(1998)The low atomic mass elements B, Be, and Li are viewed as sensitive tracers of the involvement of subducted materials in the genesis of island arc magmas. In order to better assess the role of dense aqueous fluids in the ...
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(1997)An analysis is presented that allows the evaluation of the effect of attenuation on acoustic emission amplitude distributions and b-values obtained during the deformation of geomaterials in laboratory experiments. It is ...
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(1999)Using a coupled fluid flow-mass transfer model to calculate the Sr flux resulting from the weathering of the young Columbia River basalts, it can be shown that the dissolution of the reactive phases in the extensive ...
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(2001)The paper examines the peculiar features of tourmaline-quartz type gold deposits distribution in the earth's crust, as well as its occurrence and principal mineralogical and geochemical features. Presumably, metal borides ...
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(1999)We develop recent models of crystal-liquid partitioning (Blundy and Wood, 1994; Wood and Blundy, 1997) to predict the effects of crystal chemistry on the partitioning of U-series elements between clinopyroxene and coexisting ...
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(2001)Millipede microstructures are described from Archean metaturbidites surrounding the Back River volcanic complex, eastern Slave Structural Province. They are locally developed within andalusite porphyroblasts that grew in ...
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(2001)Structural, geophysical and metamorphic studies show that collisional orogeny thickens the crust by a factor of two or more. A large volume of continental material at the base of the orogen is, therefore, subject to eclogite ...
Now showing items 12571-12590 of 21253