Noble gases and radiocarbon in natural gas hydrates

Publication Type  Journal Article
Year of Publication  2002
Authors  Winckler, G.; Aeschbach-Hertig, W.; Holocher, J.; Kipfer, R.; Levin, I.; Poss, C.; Rehder, G.; Suess, E.; Schlosser, P.
Journal Title  Geophysical Research Letters
Volume  29
Issue  10
Pages  -
Journal Date  May 15
ISBN Number  0094-8276
Accession Number  ISI:000178888300083
Key Words  sea

[1] In samples of pure natural gas hydrates from Hydrate Ridge, Cascadia Margin, virtually no helium and neon components are present providing evidence that the light noble gases are not incorporated into the structure of natural methane hydrates. In contrast, the hydrates contain significant amounts of argon, krypton and xenon. These gases show a distinct fractionation pattern, with the heavier ones preferentially incorporated into the gas hydrate structure. The hydrate methane is devoid of C-14 indicating that there is no contribution of a recent (C-14-active) organic carbon reservoir to the hydrate carbon pool. On the basis of the delta(13)C and delta(2)H signature, it appears that microbial CO2-reduction is the dominant CH4 production pathway.


609DLTimes Cited:5Cited References Count:14

URL  <Go to ISI>://000178888300083
DOI  Doi 10.1029/2001gl014013