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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Relationship between13C and18O fractionation and changes in major element composition in a recent calcite-depositing spring — A model of chemical variations with inorganic CaCO3 precipitation
TL;DR: In this paper, a theoretical model is derived in which isotopic fractionations can be calculated as a function of variations in dissolved carbonate species on CO 2 degassing and calcite precipitation.
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Variability in the Benguela Current upwelling system over the past 70,000 years
C. P. Summerhayes,Dick Kroon,Antoni Rosell-Melé,R. W. Jordan,H.-J. Schrader,H.-J. Schrader,R. Hearn,J. Villanueva,Joan O. Grimalt,Geoffrey Eglinton +9 more
TL;DR: In this paper, the intensity and location of upwelling in the Benguela Current Upwelling System off Namibia changed significantly during the last 70,000 years, indicating that this accumulation responded to changes in the precession index; at these times monsoons would have been weakest and Trade Winds strongest.
Journal ArticleDOI
Organic carbon 13C12C variations in estuarine sediments
David J. Shultz,John A. Calder +1 more
TL;DR: For the Mississippi River, terrestrial organic carbon is limited to sediments within 69 km of the mouth of Pass a Loutre and 61 km of South Pass as mentioned in this paper, indicating that the low δC13 (< −22%) values reported for Pleistocene sediments in the Gulf of Mexico may be the result of factors in addition to the postulated large influx of terrestrial carbon.
Journal ArticleDOI
Industrialization affects heavy metal and carbon isotope concentrations in recent Baltic Sea sediments
TL;DR: In this article, the authors analyzed sediment cores of the western Baltic Sea for heavy metal and carbon isotope contents and determined the sedimentation rate was determined from radiocarbon dates to be 1.4 mm/yr.
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The isotopic composition of carbonaceous matter in a metamorphic profile from the Swiss Alps
TL;DR: In this paper, the carbon isotopic composition of carbonaceous matter in a metamorphic profile from the Swiss Alps has been determined and the analyzed samples range from unmetamorphosed sediments to staurolite schists.
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.