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Carbon-13 in black sea waters and implications for the origin of hydrogen sulfide.
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TLDR
The contribution of organic sulfur to the hydrogen sulfide lies between 3 and 5 percent and increases with depth, likely causes for the increase are increasing productivity or upward movement of the anoxic zone during the facts last 2000 year.Abstract:
A combination of measurements of carbon-13 and the hydrogen sulfide content in Black Sea waters with available data on the total carbon dioxide in these waters indicates that the contribution of organic sulfur to the hydrogen sulfide lies between 3 and 5 percent and increases with depth. Likely causes for the increase are increasing productivity or upward movement of the anoxic zone during the facts last 2000 year.read more
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A steady-state model for sulphur isotope fractionation in bacterial reduction processes
TL;DR: A model is developed to explain the isotope fractionation effects produced in laboratory experiments involving the reduction of sulphate to hydrogen sulphide by the bacterium Desulfovibrio desulfuricans, which differs from previous ones in its use of zero-order kinetics.
Journal ArticleDOI
Anomalous carbonate precipitates; is the Precambrian the key to the Permian?
TL;DR: Late Permian reefs of the Capitan complex, west Texas; the Magnesian Limestone, England; Chuenmuping reef, south China; and elsewhere contain anomalously large volumes of aragonite and calcite marine cements and sea-floor crusts, as well as abundant microbial precipitates, interpreted to have formed in a stratified ocean with anoxic deep waters enriched in carbonate alkalinity.
Journal ArticleDOI
Microbial sulfate reduction rates and sulfur and oxygen isotope fractionations at oil and gas seeps in deepwater Gulf of Mexico
Paul Aharon,Baoshun Fu +1 more
TL;DR: In this article, a manned submersible from fine-grained sediments containing dispersed gas hydrates at the threshold of stability was recovered with a sub-surface detector.
Journal ArticleDOI
Carbon Isotope Variability across the Ediacaran Yangtze Platform in South China: Implications for a Large Surface-to-Deep Ocean δ13C Gradient
TL;DR: In this article, new isotope data obtained from relatively conformable, carbonate-rich strata of the Ediacaran Yangtze platform in South China reveal substantial δ 13 C variability.
Journal ArticleDOI
Geochemistry of recent TOC-rich sediments from the Gulf of California and the Black Sea
TL;DR: In this article, the chemistry of the Gulf of California sediments reflects regeneration processes which occur in the water column; i.e. only a small fraction (<10%) of elements like Cd, which in seawater are coupled to the ''labile« nutrients (C, N, P), is buried in the sedimentary column.
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 elementary chemical composition of marine organisms
BookDOI
Hot Brines and Recent Heavy Metal Deposits in the Red Sea
Egon T. Degens,David A. Ross +1 more
Journal ArticleDOI
Isotopic evidence for diminishing supply of available carbon during diatom bloom in the Black Sea.
TL;DR: Plankton samples taken during the cruise of R/V Atlantis II in the Black Sea during March and April 1969 were analysed for their 13C/12C ratios and showed uniform δ13C values near −23 parts per 1,000.
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