Indicators of δ13C and δ18O of gas hydrate-associated sediments

Autor: Jiasheng Wang, E. Suess
Rok vydání: 2002
Předmět:
Zdroj: Chinese Science Bulletin. 47:1659-1663
ISSN: 1861-9541
1001-6538
DOI: 10.1007/bf03184118
Popis: The analyses of δ13C and δ18O of gas hydrate-associated sediments from two cores on Hydrate Ridge in Cascadia convergent margin offshore Oregon, eastern North Pacific show the values of δ13C from −29.81‰ to −48.28‰ (PDB) and δ18O from 2.56‰ to 4.28‰ (PDB), which could be plotted into a group called typical carbonate minerals influenced by the methane in cold venting. Moreover, the values of δ13C and δ18O show a consistent trend in both cores from top to bottom with increasing of δ13C and decreasing of δ18O. This trend could be explained as an effect caused by the anaerobic oxidation of methane (AOM) in depth and the oxygen fraction during the formation of gas hydrate in depth together. These characteristics of δ13C and δ18O indicate that the gas hydrate-associated sediments are significantly different from the normal marine carbonates, and they are deeply influenced by the formation and evolution of gas hydrate. So, the distinct characteristics of δ13C and δ18O of gas hydrate-associated sediments could be undoubtedly believed as one of parameters to determine the presence of gas hydrates in other unknown marine sediment cores.
Databáze: OpenAIRE
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