oxygen-isotope ratio
Ice-shelf – ocean interactions at Fimbul Ice Shelf, Antarctica from oxygen isotope ratio measurements
... on oxygen isotope ratio measure- ments made on the continental shelf in front of Fimbul Ice ...of oxygen, H 16 2 O and H 18 2 O, is used as a tracer for meteoric water input, and is especially ...
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The stable oxygen isotope ratio of resin extractable phosphate derived from fresh cattle faeces
... The U ‐ tube was then evacuated to a pressure of <10 −2 mbar, removing all the residual atmosphere. Once under stable vacuum, the U ‐ tube was sealed, removed from the vacuum line and the sample side of the tube ...
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The stable oxygen isotope ratio of resin extractable phosphate derived from fresh cattle faeces
... the opposite side of the glass U-tube in liquid nitrogen, forcing evaporating sample water to condense and collect. This set up was maintained for at least 1 hour to ensure complete water transfer. Sample water was ...
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Pliocene diatom and sponge spicule oxygen isotope ratios from the Bering Sea: isotopic offsets and future directions
... of oxygen isotopes in palaeoenvironmental research is well documented for both lacustrine and marine envi- ronments, predominantly from carbonate fossils, but more recently from siliceous microfossils (Emiliani, ...
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Post mortem oxygen isotope exchange within cultured diatom silica
... Following these observations, it is clear that future methodological protocols should be adapted to circumvent potential oxygen isotope alteration during laboratory treatment. The obvious solution would be ...
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Spatial patterns in the oxygen isotope composition of daily rainfall in the British Isles
... Spatial patterns in the oxygen isotope composition of daily rainfall in the British.. 1 Department of Earth Sciences, The University of Adelaide, Adelaide, South.[r] ...
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An analytical system for stable isotope analysis on carbon monoxide using continuous-flow isotope-ratio mass spectrometry
... ninkmeijer and Röckmann, 1997). δ 13 C values for CO from fossil fuel combustion, biomass burning, and NMHC oxida- tion range between − 27 and − 32 ‰ (Manning et al., 1997; Stevens and Wagner, 1989). For CO sources that ...
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Environmental and physiological controls over carbon and oxygen isotope variations in plants
... I specifically report on daily variation in the stable isotopes of C, N, 0 and H in the water and dry matter of xylem, phloem, leaves, and fruits of lupin, a legume commonly grown as a g[r] ...
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Phosphate stable oxygen isotope variability within a temperate agricultural soil
... Given that spatial autocor- relation effects are absent (both globally and within each partition), and that the declustered data is used, we can report the signi fi cance of these correla[r] ...
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Reconstructing Fire Severity From the Oxygen-Isotope Compositions of Plant Char
... restricts oxygen movement to the interior of the sample, resulting in ideal conditions for char formation (Schumacher et ...for oxygen-isotope ...
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Unusual, basin scale, fluid rock interaction in the Palaeoproterozoic Onega basin from Fennoscandia : preservation in calcite δ18O of an ancient high geothermal gradient
... this is interpreted as oxygen isotope resetting by fluid-rock interaction depth trend of δ18O was controlled by a high ancient geothermal gradient..[r] ...
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High precision isotope ratio measurements of uranium and plutonium in the environment
... TIMS in contrast to ICPMS has stable beams and is commonly used for plutonium isotopic ratio measurements (e.g. Buesseler and Halverson, 1987). The instrument used is a single- focusing VG (Micromass) Sector 54 ...
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The effects of dissolution on the silicon and oxygen isotope compositions of silica phytoliths
... Many studies have examined how formation processes and environments affect the final isotopic composition of biogenic silica, although most focus on diatoms rather than phytoliths (Dodd and Sharp 2010; Brandriss et al., ...
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Recent advances in the application of stable isotope ratio analysis in forensic chemistry
... (ANFO) explosives.The authors conclude that this multi-isotope approach provides greater discrimination between explosive families and also that the manufacturing process along with the geographic origin of the ...
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Ferroan dolomite cement in Cambrian sandstones: burial history and hydrocarbon generation of the Baltic sedimentary basin
... The conditions and timing of carbonate cementation in Cambrian sandstones of the Baltic sedimentary basin were determined by oxygen and carbon stable isotope and chemical data in combination with optical ...
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Stable oxygen isotope variability in two contrasting glacier river catchments in Greenland
... Abstract. Analysis of stable oxygen isotope (δ 18 O) charac- teristics is a useful tool to investigate water provenance in glacier river systems. In order to attain knowledge on the di- versity of δ 18 O ...
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Stable oxygen and hydrogen isotope fractionation factors for the Goethite (hematite)-water system
... mineral-water oxygen isotope fractionation factors calculated from the - T relations given by various researchers ranged from -8 to 2 for goethite ( at 70 ºC) and ...
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Isotope dilution spaces of mice injected simultaneously with deuterium, tritium and oxygen 18
... The isotope dilution technique for measuring total body water (TBW), and the doubly labelled water (DLW) method for measuring energy expenditure, are both sensitive to small variations in the ratio of the ...
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Evolution of Pliocene climate cyclicity at Hole 806B (5-2 Ma); oxygen isotope record
... It is a history of both a cooling trend, with superimposed ice-volume and climate fluctuations of Milankovitch type, as well as a shift in the pattern of oxygen isotope fluctuations afte[r] ...
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Extended orbitally forced palaeoclimatic records from the equatorial Atlantic Ceara Rise
... in amplitude every ~41ka, a very strong eccentricity signal in the carbon isotope records, and a strong, but probably local, imprint of climatic precession on the coarse fraction and magnetic susceptibility ...
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