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Browsing ELibrary by Title
Now showing items 10641-10660 of 21934
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(1995)A new stepwise leaching procedure applied to Ca-bearing silicates enables the selective recovery of radiogenic and common Pb from a mineral, and thus makes single-phase Pb-Pb dating possible. This permits independent dating ...
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(2002)The second-order elastic constants of CaF2 (fluorite) have been determined by Brillouin scattering to 9.3 GPa at 300 K. Acoustic velocities have been measured in the (111) plane and inverted to simultaneously obtain the ...
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(2004)Single-crystal elastic constants of a natural Fe-rich olivine (Fe 0.94 Mn 0.06) 2 SiO 4 were determined by Brillouin scattering to 12.1 GPa. The aggregate bulk modulus, shear modulus, and their pressure derivatives are K ...
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(1997)The complete set of elastic stiffness coefficients of a single crystal of Mg2SiO4 in the modified spinel (wadsleyite) structure are reported at eight pressures from ambient to 14 Gigapascals (GPa). All moduli vary linearly ...
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(2002)Single crystals of synthetic vanadium-, chromium- and cobalt-bearing garnets, Pyr:V0.06, Pyr:V0.13, Pyr:Cr0.04, Pyr:Co0.10, and Gt:Co3.00, and a natural vanadium-bearing grossular, Gross:V0.07 (Cr3+ < 0.005), were studied ...
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(2003)Unpolarized, (X,Y)-mixed electronic absorption spectra were measured on (001) plates of two natural orthopyroxenes with 24 and 45 mole % ferrosilite and with a Ca content 0.07 atoms pfu, at pressures up to 10.3 and 8.83 ...
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(2000)Pyrope single crystals doped with transition-metal ions (Co, Cr, Ni, Ti and V) were synthesised in a piston-cylinder device at 950-1050°C and 25 kbar. Stoichiometric oxide mixtures were used as starting materials and ...
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(2004)Synthesis experiments in the system MgAl2O4–MgFe2O4 [MgAl2−x Fex O4 (0 ≤ x ≤ 2)] were carried out using a PbF2 flux. The crystalline products synthesized in the compositional range of 0.6 <x ≤ 1.2 consisted of two spinel ...
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(2003)A sample of nepheline from Egan Chute, near Bancroft, Ontario, with a chemical composition (K1.332□ 0.68) (Na6.05Ca0.22) [Al7.77Si8.21O32], has been studied using single-crystal X-ray diffraction, transmission electron ...
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(1997)The Hecla Hoek Complex, a ∼ 18-km-thick succession in the Svalbard Caledonian Eastern Terrane, has been interpreted to be a more or less continuous volcano-sedimentary sequence. Amphibolite-facies rocks in the lower parts ...
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(1996)There are good grounds to correlate the Lower and Upper Sinian in China with the Baikalian and Yudomian (Vendian) in Siberia, correspondingly. Their comparison, based on event stratigraphy, is corrected by data on stratigraphy ...
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(2000)Two natural dunites were annealed at pressure P=300 MPa, temperature T=1373, 1473 and 1573 K, and fO2 within the stability field of olivine. The starting materials contained small amounts of hydroxyls in the form of minor ...
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(2004)A set of nine samples of axinite, selected from 60 specimens from worldwide localities, were investigated by single-crystal X-ray diffraction, electron and ion microprobe, and 57Fe Mössbauer spectroscopy. The selected ...
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(2002)In 1911, the surface-wave magnitude 8.2 Kemin earthquake hit northeastern Tien Shan (Kyrgyzstan), close to the cities of Bishkek and Almaty, the capitals of Kyrgyzstan and Kazakhstan, respectively. Several hundreds of ...
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(2002)Twelve nontronites and two ferruginous smectites have been characterized with respect to Fe3+ occupancy of tetrahedral sites. The techniques used were near infrared, Fe-K X-ray absorption near-edge and X-ray absorption ...
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(2004)Spatially resolved luminescence spectra from U(VI) co-precipitated at the (101̄4) growth surface of synthetic calcite single crystals confirm heterogeneous incorporation corresponding to the distribution of structurally ...
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(2001)An algorithm was developed using the 2.5-D elastodynamic wave equation, based on the displacement-stress relation. One of the most significant advantages of the 2.5-D simulation is that the 3-D radiation pattern can be ...
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(2003)We propose a method to estimate the radius, dip and strike of a circular seismic rupture through the inversion of first P- and S-wave pulse widths measured on microearthquake records. The method is based on quite general, ...
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(2005)Polyaromatic hydrocarbons (PAHs) are often considered as abundant and widespread organic structures in the universe and such structures are known to build the macromolecular network of the organic matter in carbonaceous ...
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(2001)The size distribution of oil and gas fields within an arbitrary petroleum basin is approximated by the truncated Pareto distribution. We propose definite expressions for assessing the number and total resources of fields ...
Now showing items 10641-10660 of 21934