Book ChapterDOI
The Origin and Distribution of Methane in Marine Sediments
George E. Claypool,Isaac R. Kaplan +1 more
- pp 99-139
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TLDR
Methane has been detected in several cores of rapidly deposited (> 50 m/my) deep sea sediments as discussed by the authors, and the methane originates predominantly from bacterial reduction of CO2, as indicated by complimentary changes with depth in the amount and isotopic composition of redox-linked pore water constituents.Abstract:
Methane has been detected in several cores of rapidly deposited (> 50 m/my) deep sea sediments. Other gases, such as carbon dioxide and ethane, are commonly present but only in minor and trace amounts, respectively. The methane originates predominantly from bacterial reduction of CO2, as indicated by complimentary changes with depth in the amount and isotopic composition of redox-linked pore water constituents: sulfate-bicarbonate and bicarbonate-methane.read more
Citations
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Journal ArticleDOI
Early oxidation of organic matter in pelagic sediments of the eastern equatorial Atlantic: suboxic diagenesis
Philip N. Froelich,Gary P. Klinkhammer,Michael L. Bender,Nile A. Luedtke,G.R. Heath,Doug Cullen,Paul Dauphin,Doug Hammond,Blayne Hartman,Val Maynard +9 more
TL;DR: Pore water profiles of total CO 2, pH, PO 3−4, NO − 3 plus NO − 2, SO 2− 4, S 2−, Fe 2+ and Mn 2+ have been obtained in cores from pelagic sediments of the eastern equatorial Atlantic under waters of moderate to high productivity as mentioned in this paper.
Journal ArticleDOI
Carbon and hydrogen isotope systematics of bacterial formation and oxidation of methane
TL;DR: In this paper, the major dissolved carbon species in diagenetic settings are represented by the two carbon redox endmembers CH4 and CO2, and they can be tracked with the aid of carbon ( 13 C / 12 C ) and hydrogen ( D/H≡ 2 H/ 1 H ) isotopes.
MonographDOI
The Biomarker Guide
TL;DR: The second edition of The Biomarker Guide as mentioned in this paper provides a comprehensive account of the role that biomarker technology plays both in petroleum exploration and in understanding Earth history and processes.
Journal ArticleDOI
Biogenic methane formation in marine and freshwater environments: CO2 reduction vs. acetate fermentation—Isotope evidence
TL;DR: In this paper, the carbon and hydrogen stable isotope composition of the methane as a function of the coexisting carbon dioxide and formation water precursors is used to distinguish two primary methanogenic pathways.
Journal ArticleDOI
Search for past life on Mars: possible relic biogenic activity in martian meteorite ALH84001.
David S. McKay,Everett K. Gibson,Kathie L. Thomas-Keprta,Hojatollah Vali,Christopher S. Romanek,Simon J. Clemett,Xavier D. F. Chillier,C. R. Maechling,Richard N. Zare +8 more
TL;DR: High-resolution scanning and transmission electron microscopy study of surface textures and internal structures of selected carbonate globules show that the globules contain fine-grained, secondary phases of single-domain magnetite and iron sulfides.
References
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Journal ArticleDOI
The solubility of nitrogen, oxygen and argon in water and seawater
TL;DR: In this paper, precise data on the solubilities of nitrogen, oxygen and argon in distilled water and seawater are fitted to thermodynamically consistent equations by the method of least squares.
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.
Book ChapterDOI
Biogeochemistry of Stable Carbon Isotopes
TL;DR: In this paper, a modification in the Nier-type mass spectrometer and a refinement in instrumentation techniques by McKinney et al. [3] finally initiated stable isotope studies of the type that are discussed in this review.