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Browsing ELibrary by Title
Now showing items 12631-12650 of 21768
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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 ...
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(2002)A majority of the world's sediment-hosted exhalative (SEDEX) lead-zinc deposits are vent-distal. They are not underlain by a discordant alteration zone or stockwork vent complex that would indicate the path by which ore ...
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(2004)The possible role of bacteria in the formation and transformation of iron minerals is considered on the basis of the Recent biogeochemical cycle of iron. Dissimilatory Fe(III)-reducing bacteria are the main agents in the ...
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(2004)The point of view that exogenic groundwaters participate in the formation of kimberlite rocks in Yakutia and South Africa is shared by many researchers. Data on the isotopic composition of minerals in these kimberlite rocks ...
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(2004)The structure and shape of collapses and resurgences is often controlled by pre-existing discontinuities, such as normal faults in rift zones. In order to study the role of extensional structures on collapse and resurgence, ...
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(1986)The effects of H2O, CO2, CH4 and HF on partial melting of a model phlogopite harzburgite mantle are considered with regard to the production of ultrapotassic magmas. Fluorine has a polymerising effect in H2O-poor conditions, ...
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(2003)The structure and debris content of four glaciers in NW Spitsbergen (Svalbard) are described to test the hypothesis that medial moraines are the product of folding, accompanied by the development of longitudinal foliation. ...
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(2004)The study of Holocene deposits from northwestern Pacific Islands is very important for understanding the natural development of the area in the context of oceanic climate, strong microclimate variability, and the influence ...
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(2001)Experimental studies have revealed a dependence of the rates of sedimentation and growth of supramolecular crystals on the degree of deionization of suspensions of monodisperse silica spheres. At low pH, the rate of ...
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(1998)Variations in the gravity field are introduced by mass or density redistribution in the vicinity of the measuring point as well as far field or global effects but also any crustal process which involves a height variation ...
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(2001)Exposed, subduction-related magmatic arcs commonly include sections of ultramafic plutonic rocks that are composed of dunite, wehrlite, and pyroxenite. In this experimental study we examined the effects of variable H2O ...
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(1996)Humic substances are complicated, naturally occurring organic compounds of high molecular weight. Owing to the presence of functional groups containing oxygen, and to a lesser extent, nitrogen and sulfur, these substances ...
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(2004)The unit-cell and atomic parameters of perdeuterated brushite have been extracted from Rietveld analysis of neutron powder diffraction data within the temperature range 4.2 to 470 K. The thermal expansion of brushite is ...
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(2003)This paper provides a review of hydromechanical (HM) couplings in fractured rock, with special emphasis on HM interactions as a result of, or directly connected with human activities. In the early 1960s, the coupling between ...
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(1996)In order to evaluate the processes responsible for the enrichments of certain siderophile/ chalcophile trace elements during the production of subduction-related magmas, representative lavas from seven subduction zones ...
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(1996)To investigate models for the generation of lunar high Ti-basalts, we have analyzed lunar picritic glasses for Zr, Nb, Ce, and Ti at high precision using ion microprobe techniques. The picritic magmas represented by these ...
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(2004)Numerical studies of the geodynamo have taken different views on the importance of inertial effects. Some have neglected inertia, while others have boosted its strength, in much the same way as they have had to take an ...
Now showing items 12631-12650 of 21768