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Now showing items 15425-15444 of 39126
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(2001)The observation and description of surface proximity effects, whereby the chemical reaction of one surface site influences the electronic structure and reactivity of neighboring or nearby sites, is presented in this study ...
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(2004)The crystal structure of members of the pyrophanite-ecandrewsite solid-solution series, Mn1-xZnxTiO3 (0.1 less than or equal to x less than or equal to 0.8 apfu). synthesized by ceramic methods in air at ambient pressure, ...
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(1988)The quasi-stationary state approximation to mass transport and fluid-rock interaction provides a quantitative description of metasomatic processes over geologically significant time spans. Each stationary state describes ...
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(2005)The subject of this paper is the structure of the peculiar rock complex of the East European Platform, composed of the rocks dated 1750 Ma to 1300 Ma and known as a quasiplatform rock cover. The western and eastern segments ...
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(1998)We have investigated variations of 4He content in the different zones of single natural diamond crystals using a step combustion technique. The results indicate that some diamonds may be strongly irradiated during their ...
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(2001)Compositional fields for spinels from a wide variety of maficultramafic igneous rock types and tectonic environments have been determined from a global database of over 26 000 analyses. These fields are defined using ...
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(1998)We describe a laser fluorination technique specifically for quartz that allows both high-accuracy and high-precision determination of oxygen isotope ratios, regardless of grain size. The rapid heating, defocused beam ...
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(2000)The geometry of fluid-filled pores in texturally equilibrated aggregates can, in theory, be uniquely determined given the porosity and the equilibrium dihedral angle for all possible orientations and combinations of the ...
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(1998)Rate coefficients are reported for exchange of hydration waters in the inner-coordination-sphere of Al(III)-methylmalonate complexes with bulk solution as determined via 17O-NMR. Surprisingly, water molecules in the ...
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(1999)Rate parameters are reported for exchange of hydration waters from the inner coordination sphere of Al(III)-sulfosalicylate [Al(sSal)+] and Al(III)-salicylate [Al(Sal)+] complexes to bulk solution as determined with 17O-NMR. ...
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(1995)The ratio of dibenzothiophene to phenanthrene and the ratio of pristane to phytane, when coupled together, provide a novel and convenient way to infer crude oil source rock depositional environments and lithologies. Such ...
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(2003)The ratios of coexisting marine phyla (p), classes (c), orders (o), families (f), and genera (g) through the Phanerozoic can be described as an exponential trend. The number of genera can be calculated as an interval between ...
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(2004)Thus, Rb-Sr isotopic-geochemical investigations indicate the Paleoproterozoic (1.7 Ga) age of wall-rock metasomatites, beresite aureoles, and, presumably, mesothermal gold mineralization of the Taloveis deposit. The formation ...
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(1998)The Re-Os isotope sytem, based on the long-lived β − transition of 187 Re to 187 Os, has matured to wide use in cosmochemistry and high-temperature geochemistry. The siderophilic/chalcophilic behavior of Re and Os is ...
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(1991)The isothermal (750°C) experiments of Lagache and Dujon (1987) reveal that the partitioning of Sr between plagioclase feldspar and hydrothermal solutions is a funtion of the anorthite (An) content of the plagioclase, ...
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(2001)Specimens of tobermorite 11Å from Wessels mine, South Africa, an 'anomalous' tobermorite, and from BaÏ scenov, Urals, Russia, a 'normal' tobermorite, have been studied through X-ray diffraction. Their structural disorder, ...
Now showing items 15425-15444 of 39126