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Browsing ELibrary by Title
Now showing items 8347-8366 of 17743
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(2001)Laser ablation microprobe-inductively plasma-mass spectrometry (LAM-ICP-MS) with a frequency quadrupled Nd-YAG UV laser (266 nm) has been used as a fast and relatively low cost technique to successfully determine the ...
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(2001)We have developed a new, highly precise method for U isotopic analysis using a thermal ionization mass spectrometry (TIMS) by measuring UO2+ ions emitted from a very small amount (100-10 ng) of U. A new ionization activator, ...
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(1999)The stable isotope geochemistry of Cu and Zn is poorly known because of the lack of a suitable analytical technique. We present a procedure for the analysis of Cu and Zn isotope compositions by plasma-source mass spectrometry ...
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(2004)New techniques of isotopic measurements by a new generation of mass spectrometers equipped with an inductively-coupled-plasma source, a magnetic mass filter, and multiple collection (MC-ICPMS) are quickly developing. These ...
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(2002)We describe analytical techniques for the measurement of 226Ra-230Th-238U disequilibria in volcanic rocks using plasma ionization multicollector mass spectrometry (MC-ICP-MS). Our methods build upon previous MC-ICP-MS ...
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(1997)The plasma-source mass spectrometer equipped with both a magnetic mass filter and multiple collection (PSMS) of Lyon was tested for high-precision analysis of neodymium isotopic compositions. These can be determined on as ...
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(1997)We describe a technique for determining the boron isotopic composition of low-B silicate rocks which until recently have been difficult to analyze. The method involves an alkali carbonate fusion for sample dissolution, ...
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(1996)An improved procedure for lithium isotope analysis using Li3PO4 as the ion source has been investigated for application to geological samples. The 7Li/6Li ratio is measured using double rhenium filament thermal ionization ...
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(1995)We detail a method for the precise and accurate determination of isotopic variations in the ratio with a precision of ±0.5‰ (2σm). Purified potassium is chemically extracted from rocks, soils, minerals, or solutions by ion ...
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(1996)New and precise data on the 138Ce142Ce ratio in marine manganese nodules obtained from the Atlantic and Pacific Oceans fall within a narrow range of −0.6 to + 1.1 in terms of ϵCe (one tenth of per mil difference from the ...
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(2002)The Maksyutov complex (Southern Urals, Russia) is a well-preserved example of subduction-related high-pressure metamorphism. One of its two litho-tectonic units consists of rocks that experienced eclogite-facies conditions. ...
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(2002)We present the results of a comparative study of several geochronometer minerals (baddeleyite, zircon, apatite, phlogopite and tetraferriphlogopite) and isotopic systems (U-Pb, Th-Pb and Rb-Sr) from phoscorites ...
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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 ReOs 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 ...
Now showing items 8347-8366 of 17743