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Browsing ELibrary by Title
Now showing items 5381-5400 of 21936
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(1988)In this article, we give the results of our geologic study of the inhomogeneity in a Pliocene lava flow in the Monkres River basin in the Iya-Uda interfluve in the Eastern Sayan. The flow basalt here is black or dark gray ...
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(2000)We investigated high-precision Pb isotope ratio analysis by multi-collector-inductively coupled plasma-mass spectrometry (MC-ICP-MS) using added thallium as an internal isotopic standard to correct for mass dependent ...
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(2000)We have developed a method for the rapid, in situ measurement of U-Th isotopic compositions at the semimicro scale using laser ablation sampling, combined with multiple collector ICP magnetic sector mass spectrometry ...
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(1999)High precision in situ oxygen isotope analyses of quartz using an ArF laser are described. The high precision is documented by comparing in situ ArF laser data with CO2 laser and conventional analyses of silica and quartz. ...
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(2003)The rock stratigraphic record exists as a rich, albeit complex and incomplete repository of Earth history, tracing the processes of biological evolution, climate change, oceanic and atmo-spheric ...
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(2003)Alpine-type orogenic belts are produced by short-lived subduction of an ocean basin and the underflow of continental crust, resulting in suturing. Old, relatively competent sialic basement and superjacent units characterize ...
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(1992)At pressures higher than ∼22 kbar, near-solidus melts of peridotite + CO2 + H2O are carbonatitic and may be able to separate from their source regions at liquid fractions as low as 0.01%. At such low degrees of partial ...
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(2002)Pressure-induced structural modifications in the zeolite bikitaite are studied by means of in situ synchrotron X-ray powder diffraction and ab initio molecular dynamics. The experimental cell parameters were refined up to ...
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(1999)The high-pressure response of the cell parameters of calcite, CaCO3, has been investigated by single crystal X-ray diffraction. The unit cell parameters have been refined from 0 to 1.435 GPa, and the linear and volume ...
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(2004)Four main serpentine varieties can be distinguished on the basis of their microstructures, i.e. lizardite, antigorite, chrysotile and polygonal serpentine. Among these, antigorite is the variety stable under high pressure. ...
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(2003)The crystal structure of synthetic kosmochlor, NaCrSi2O6, was studied using single crystal X-ray diffraction at high pressure. A four-pin diamond anvil cell, with 4:1 methanol:ethanol pressure me-dium, was used to achieve ...
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(2002)Pressure-induced structural modifications in scolecite were studied by means of in situ synchrotron X-ray powder diffraction and density functional computations. The experimental cell parameters were refined up to 8.5 GPa. ...
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(1999)The room-temperature static compression of magnesite (MgCO 3 ) has been measured by X-ray powder energy-dispersive diffraction in a diamond-anvil cell. Different pressure transmitting media and an internal pressure standard ...
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(2004)High-pressure, high-temperature diamond growth experiments have been conducted in the system C–K2CO3–KCl at 1050–1420 °C, 7.0–7.7 GPa. KCl is of interest because of the strong effect of halogens on the phase relations of ...
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(2003)High-pressure granulites are characterised by the key associations garnet-clinopyroxene-plagioclase-quartz (in basic rocks) and kyanite-K-feldspar (metapelites and felsic rocks) and are typically orthopyroxene-free in both ...
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(1996)Luminescence spectroscopy of transition elements can provide useful information on their binding properties, local environment and crystal-field stabilization energies in various materials. In order to investigate the ...
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(2003)High-pressure multi-anvil experiments (5 to 10 GPa) have been conducted on a basalt + calcite mixture in order to constrain the fate of carbonates carried on subducted ocean floor. Up to 6 GPa, carbonate breakdown occurs ...
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(2003)Mafic microgranular enclaves, composed of diopside and rare magnesium biotite phenocrysts in a groundmass of diopside, biotite, apatite, Fe-Ti-oxides, and alkali feldspar, are associated with Neoproterozoic Piquiri potassic ...
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(2003)Many ocean island basalts (OIB) that have isotopic ratios indicative of recycled crustal components in their source are silica-undersaturated and unlike silicic liquids produced from partial melting of recycled mid-ocean ...
Now showing items 5381-5400 of 21936