Journal ArticleDOI
Methane-derived marine carbonates of pleistocene age.
John C. Hathaway,Egon T. Degens +1 more
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TLDR
In some calcium carbonate-bearing sandstones from the edge of the continental shelf off the northeast United States, the δC13 range is from -30 and -60 per mil for both aragonite and high-magnesium calcite, suggesting deposition at temperatures around 0�C.Abstract:
In some calcium carbonate-bearing sandstones from the edge of the continental shelf off the northeast United States, the δC 13 range is from -30 and -60 per mil for both aragonite and high-magnesium calcite. The δC 13 of co-existing shells of Modiolus sp. is normal (+ 1.7 to -2.7 per mil). The δO 18 values of around + 3.5 per mil in all samples suggest deposition at temperatures around 0°C. Quaternary methane oxidized either chemically or microbiologically to carbon dioxide is the probable source of carbon in these carbonates.read more
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Journal ArticleDOI
Stable isotopes and limestone lithification
TL;DR: In this paper, the carbon and oxygen isotopic composition of carbonate sediments, limestones and calcite cements are compiled and reviewed, and an elementary exposition of the factors that control them is given.
Journal ArticleDOI
Generation, Accumulation, and Resource Potential of Biogenic Gas
TL;DR: The most important mechanism of methane generation in marine sediments is the reduction of CO2 by hydrogen (electrons) produced by the anaerobic oxidation of organic matter.
Journal ArticleDOI
Methane oxidation in sediment and water column environments—Isotope evidence
TL;DR: In this paper, three models: % residual methane, higher hydrocarbon enrichment, and CO2-CH4 coexisting pairs are used to independently calculate fractionation factors (αc) in the range of 1.002-1.014.
ReportDOI
Compilation of minimum and maximum isotope ratios of selected elements in naturally occurring terrestrial materials and reagents
Tyler B. Coplen,Jessica A. Hopple,J. K. Böhlke,H. S. Peiser,S. E. Rieder,H. R. Krouse,K. J. R. Rosman,T. Ding,Robert D. Vocke,Kinga Revesz,Andrée Lamberty,Philip D. P. Taylor,P. De Bièvre +12 more
TL;DR: In this article, the authors present a list of the ranges in isotopic composition and reporting of isotope ratios for different types of isotopes, including water, carbonate and bicarbonate.
References
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Journal ArticleDOI
Isotopic standards for carbon and oxygen and correction factors for mass-spectrometric analysis of carbon dioxide
TL;DR: 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.
Journal ArticleDOI
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.
Journal ArticleDOI
Carbon isotope fractionation in bacterial production of methane.
TL;DR: Fractionation factors determined at 30�C and 23�C were 1.081 and 1.094, respectively, which indicates that this process is dependent on temperature.
Journal ArticleDOI
Carbon Isotope Fractionation in the System CO 2 (gas)—CO 2 (aqueous)—HCO 3 − (aqueous)
W. G. Deuser,Egon T. Degens +1 more
TL;DR: Carbon isotope fractionation between gaseous carbon dioxide and aqueous bicarbonate decreases from 9.2 to 6.8 parts per thousand over the temperature range 0°-30° C as mentioned in this paper.
Journal ArticleDOI
Carbon-13 isotope effects in systems containing carbon dioxide, bicarbonate, carbonate, and metal ions
TL;DR: The fractionation of 13C between CO2 and CO3−HCO3−(aq) in solution has been studied in single stage experiments using carbonic anhydrase to catalyze the hydration of CO2 as mentioned in this paper.