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Browsing ELibrary by Title
Now showing items 9502-9521 of 22187
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PRECISE ISOTOPE ANALYSIS OF NANOGRAM-LEVEL PB FOR NATURAL ROCK SAMPLES WITHOUT USE OF DOUBLE SPIKES (2002)A simple technique has been developed for the precise analysis of lead isotope in natural rock samples by thermal ionization mass spectrometry (TIMS). Two-stage column chromatography, using 100 and 10 μl columns, was used ...
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(2001)Precise measurements of the isotopic composition of Li in low-concentration natural carbonate samples is demonstrated for quadrupole ICPMS. Cool plasma conditions result in high sample/background ratios for the measured ...
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(1998)The activity/composition relations of H2O-N2 and H2O-CO2 fluids have been measured at 500°C, 500 bars. The results are more accurate, and much more precise, than any currently available, especially for H2O-poor compositions. ...
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(1997)An analytical method for high-precision measurement of zirconium isotope ratios using a Sector thermal ionization mass spectrometer (TIMS) is reported. The chemical separation procedure of Zr has been refined by employing ...
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(1999)For estimations of P-T conditions of igneous and metamorphic rocks, Fe 3 in coexisting minerals is either assumed to be zero or is calculated from electron microprobe analyses (EMPA) based upon stoichiometry and charge ...
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(2004)Precise Pt–Re–Os isotopic and highly siderophile element (HSE) data are reported for 10 drill core samples collected across a 2.7 m thick, differentiated komatiite lava flow at Pyke Hill in Ontario, Canada. The Re–Pt–Os ...
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(1996)The Re-Os system for samples of FeNi, sulphide, and phosphide from iron meteorites was investigated. Techniques were developed which yield reproducible analyses for Re/Os at the 2%‰ level and which permit complete isotopic ...
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(1999)We present Re–Os, Sm–Nd and Pb–Pb isotope and trace element data for the Konchozero sill, a layered mafic–ultramafic intrusion in the Early Proterozoic Onega plateau, one of the oldest continental flood basalt provinces ...
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(1999)Marine carbonate skeletons like deep-sea corals are frequently coated with iron and manganese oxides/hydroxides which adsorb additional thorium and uranium out of the sea water. A new cleaning procedure has been developed ...
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(2001)Following the discovery of an apparent precompaction irradiation of a chondrule, we studied the isotopic abundances of noble gases He, Ne, and Ar in separated chondrule and matrix samples of eight ordinary chondrites. The ...
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(2004)It is now recognized that the earthquake hazard systems evolve naturally to the self-organized critical (SOC) state, in which the system is very sensitive to any external perturbations, and when the large avalanches (strong ...
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(2000)Laboratory modeling showed that a macrofracture was preceded by typical acoustic emission phases. These are acoustic quiescence, gradual restriction of acoustic activity toward the future macrofracture location accompanied ...
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(1999)Variations of several seismicity parameters during the precursory periods of large Kamchatka earthquakes of 1996-1997 were investigated. The successive phases of clustering, quiescence, and foreshock activity culminated ...
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(2002)We investigated the characteristics of the precursory seismicity changes associated with the M=6.8 Nemuro Peninsula earthquake, January 28, 2000 by applying the RTL (Region–Time–Length) algorithm to the earthquake catalogue ...
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(2001)The time series of annually averaged global surface temperature anomalies for the years 1856-1998 is studied through nonlinear time series analysis with the aim of estimating the predictability time. Detection of chaotic ...
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(2002)A possible structure for hydrous modified olivine (HyM-α) has been obtained by the subtraction of Mg3SiO5 from forsterite by crystallographic shear along a direction parallel to the [010] direction of olivine. The subtraction ...
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(1996)Theoretical predictions and measured isotope variations indicate that diet and physiological adaptation have a significant impact on animals δ18O and cannot be ignored. A generalized model is therefore developed for the ...
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(2004)Flash floods are a common, but poorly understood feature of arid environments. Much of the uncertainty associated with flash flooding events is associated with a lack of accurate environmental data. In addition to limiting ...
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(2003)Rapid preferential drainage or by-pass flow of water and pollutants occurs in soil macropores such as burrows and channels formed by earthworm activity in soils. We show that preferential flow through these non-capillary ...
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(2002)The viscosity of volcanic melts at the glass transition has been determined for 11 compositions ranging from basanite to rhyolite. Determination of the temperature dependence of viscosity, together with the cooling rate ...
Now showing items 9502-9521 of 22187