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Now showing items 8185-8204 of 39126
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(2002)The mineral phases of 33 eclogite and garnet clinopyroxenite samples from various tectonic settings were analysed for Li by secondary ion mass spectrometry (SIMS). In all samples, Li is preferentially incorporated into ...
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(2003)Lithium abundances in inclusions in diamonds of peridotitic, websteritic, eclogitic (including garnets with majoritic component) and lower mantle paragenesis were determined with the ion microprobe. The partitioning of Li ...
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(2002)A fossil of Libralces gallicus Azzaroli from the Khaprovian beds of the Liventsovka locality (lower course of the Don River, Middle Villafranchian) is redescribed. The proportions of the antler beams and small measurements ...
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(2003)We used 13C values to identify lichen metabolism in the globally distributed Early Devonian (409-386 Ma) macrofossil Spongiophyton minutissimum, which had been alternatively interpreted as a green plant of bryophyte grade ...
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(2002)A new genus, Flabellitha Krassilov et Jurina, gen. nov., is described based on leaflike flabellate fossils from the Givetian of central Kazakhstan. Microstructural characters suggest its affinity with foliose lichens. This ...
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(2002)Synthetic aegirine LiFeSi2O6 and NaFeSi2O6 were characterized using infrared spectroscopy in the frequency range 50–2000 cm−1, and at temperatures between 20 and 300 K. For the C2/c phase of LiFeSi2O6, 25 of the 27 predicted ...
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(2000)This laboratory study attempted to delineate the processes of iron oxide particle release from a sandy aquifer as influenced by electrostatic repulsion and chemical dissolution. The release of ferrihydrite particles by 5 ...
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(PANGAEA, 2001-06-09)
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LIGHT ELEMENT GEOCHEMISTRY OF THE TAGISH LAKE C12 CHONDRITE: COMPARISON WITH CI1 AND CM2 METEORITES (2002)We have studied the carbon and nitrogen stable isotope geochemistry of a small pristine sample of the Tagish Lake carbonaceous chondrite by high-resolution stepped-combustion mass spectrometry, and compared the results ...
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(2005)Light-induced degradation in realgar (arsenic sulfide) has been studied by means of four-circle single-crystal X-ray diffraction and X-ray photoelectron spectroscopy. Because of the alteration of realgar exposed to light, ...
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(PANGAEA, 2004-07-06)
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(2003)Ancient limestone-marl alternations are concentrated in settings analogous to loci of aragonite accumulation in the modern world. They typically occur on shelves in the tropical-subtropical climate belt, are far more ...
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(1997)It is increasingly accepted, through the use of geochemical arguments, that the Earth's mantle has a two-layer structure, comprising an upper and lower mantle. Estimates of the exchange of matter and energy between these ...
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(2002)Density of proton active surface sites at mineral surfaces is a property of fundamental importance in equilibrium modeling of surface complexation reactions. In this article, methods for an experimental determination of ...
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(2003)In the case of propagation of plane elastic waves in anisotropic gyrotropic media, Christoffel tensor is complex; its real part contains stiffnesses and an imaginary part includes components of the fifth-rank gyration ...
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(2002)A major limitation in the analysis of physical quantities measured from a stratigraphic core is incomplete knowledge of the depth to age relationship for the core. Records derived from diverse locations are often compared ...
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(1996)Geochemical arguments for a layered mantle based upon both lithophile and rare gas element abundances are well established. The negative Clayperon slope, associated with phase changes at 670 km, is expected to impede ...
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(1996)Geochemical arguments for a layered mantle based upon both lithophile and rare gas element abundances are well established. The negative Clayperon slope, associated with phase changes at 670 km, is expected to impede ...
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(2000)Structurally preserved pistillate heads from the Upper Cretaceous of Eastern Siberia are described and assigned to a new genus Lindacarpa N. Maslova gen. nov. (Hamamelidaceae) The question of the morphological divergence ...
Now showing items 8185-8204 of 39126