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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Carbon and hydrogen isotopic compositions of New Zealand geothermal gases
G.L Lyon,J.R Hulston +1 more
TL;DR: In this paper, the isotopic exchange of hydrogen with water indicates acceptable reservoir temperatures of 180-260°C from most spring samples but often higher than measured temperatures in well samples, due to partial isotopic equilibration or may reflect the origin of the methane.
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Oxygen isotope studies on Jurassic and Cretaceous belemnites from New Zealand and their biogeographic significance
G. R. Stevens,R. N. Clayton +1 more
TL;DR: In this paper, the authors presented transverse sections of New Zealand belemnites (Belemnopsis, Hibolithes, Dimitobelus) obtained from Jurassic strata correlated with Bajocian-Bathovian, Callovian and Kimmeridgian and Lower Tithonian, and Cretaceous strata with Albian-Maastrichtian.
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Choice of 17O correction affects clumped isotope (Δ47) values of CO2 measured with mass spectrometry
TL;DR: The traditional 17 O correction may have caused errors in published studies as large as 0.1 ‰ and may account for Δ47 differences among laboratories and disagreement among previously published carbonate clumped isotope thermometry calibrations.
Journal ArticleDOI
Isotopic fractionation between coexisting organic carbon—carbonate pairs in Precambrian sediments
TL;DR: The isotopic fractionation between inorganic and organic carbon in Precambrian sediments is about the same as in geologically younger rocks ( Δδ ≅ 25%) as mentioned in this paper.
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Oxidation of Combined Ingestion of Maltodextrins and Fructose during Exercise
Gareth A. Wallis,David S. Rowlands,Christopher S. Shaw,Roy L. P. G. Jentjens,Asker E. Jeukendrup +4 more
TL;DR: The present study demonstrates that with ingestion of large amounts of maltodextrin and fructose during cycling exercise, exogenous carbohydrate oxidation can reach peak values of approximately 1.5 g.min, and this is markedly higher than oxidation rates from ingesting maltodesxtrin alone.
References
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Journal ArticleDOI
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.