Journal ArticleDOI
Isotopic standards for carbon and oxygen and correction factors for mass-spectrometric analysis of carbon dioxide
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TLDR
In this paper, Niee's and Solenhofen standards were compared to the Chicago PDB standard for carbon and oxygen isotope ratios, and the correction factors for instrumental effects and for the nature of the mass spectra were derived.About:
This article is published in Geochimica et Cosmochimica Acta.The article was published on 1957-01-01. It has received 4071 citations till now. The article focuses on the topics: Carbon & Carbon dioxide.read more
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Oxygen Isotope Studies of Fresh and Weathered Submarine Basalts
TL;DR: The 18O/16O ratios of fresh unmetamorphosed basalts from the Reykjanes, Mid-Atlantic, and Gorda Ridges and the East Pacific Rise fall in a narrow range of 5.5-5.9
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Isotopic analyses based on the mass spectrum of carbon dioxide.
TL;DR: Approaches to the problem are reassessed and it is shown that methods of calculation conventionally employed can lead to systematic errors in the computed abundance of 13C and that these errors may be related to incorrect assessment of the absolute abundance of 17O.
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Kinetic fractionation of carbon-13 during calcium carbonate precipitation
TL;DR: In this paper, a surface diffusion crystal growth model is used to describe the combination of kinetic isotope effects on thermodynamic isotope fractionation during rapid diffusion controlled crystal growth, and an estimate of equilibrium ϵHCO3-Calcite of between −1.83 ± 0.32 and −2.26 −0.31% is calculated from slow precipitation runs.
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Lamont Radiocarbon Measurements VI
TL;DR: In contrast to previous radiocarbon measurement lists, this list contains only known-age samples, most of which formed during the past ten years as mentioned in this paper, and the measurements were made largely in order to gain an understanding of the distribution of radioc carbon within the dynamic carbon reservoir both today and at times in the past, since all materials forming in this reservoir today do not have the same C14/C12 ratio.
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Effect of salinity and humidity on δ13C value of halophytes—Evidence for diffusional isotope fractionation determined by the ratio of intercellular/atmospheric partial pressure of CO2 under different environmental conditions
TL;DR: Seedlings of two mangrove species and Phaseolus vulgaris plants were grown in a range of salinities and humidities in controlled environment chambers, and the results are consistent with fractionation being due both to diffusion in air and to carboxylation in the leaf.
References
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On the Isotopic Chemistry of Carbonates and a Paleotemperature Scale
TL;DR: In this paper, the temperature variation of the fractionation of oxygen in exchange reactions between dissolved carbonate and water and between calcite and water was calculated on theoretical grounds, and checked experimentally.
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Variation of O18 content of waters from natural sources
S Epstein,Toshiko K. Mayeda +1 more
TL;DR: A number of marine water and fresh water samples were examined for the relative O18O16 ratio, and the variation of this ratio was determined to a precision of ± 1% as mentioned in this paper.
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Revised carbonate-water isotopic temperature scale
TL;DR: The relationship between temperature and O(18) content relative to that for a Cretaceous belemnite of the Pee Dee formation previously reported (Epstein, Buchsbaum, Lowenstam, and Urey, 1951) has been re-determined using modified procedures for removing organic matter from shells, and is found to be 16.5 - 4.3 δ + 0.14 δ^2
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The geochemistry of the stable carbon isotopes
TL;DR: A survey of the variation of the ratio C13/C12 in nature can be found in this paper, where Urey and his co-workers used two complete feed systems with magnetic switching to determine small differences in isotope ratios between samples and a standard gas.