Physics – Geophysics
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3618504h&link_type=abstract
Geophysical Research Letters, Volume 36, Issue 18, CiteID L18504
Physics
Geophysics
6
Marine Geology And Geophysics: Gas And Hydrate Systems, Geochemistry: Stable Isotope Geochemistry (0454, 4870), Biogeosciences: Isotopic Composition And Chemistry (1041, 4870)
Scientific paper
We measured the isotopic compositions of methane (C1) and ethane (C2) of hydrate-bound gas and of dissolved gas in pore water retrieved from bottom sediments in Lake Baikal. Both structure I (sI:3%C2) and II (sII:14%C2) gas hydrates are observed in the same sediment cores in Kukuy K-2 mud volcano. We found that C2 δD of sI gas hydrate is larger than that of sII, whereas C1 δ 13C, C1 δD and C2 δ 13C values are practically the same in both hydrate structures. δ 13C of C1 and C2 of hydrate-bound gas are several permil smaller than those in pore water, showing that the current pore water is not the source of gas hydrates. These findings lead to a new model where the sII gas hydrates were formed prior to the sI hydrates.
Hachikubo Akihiro
Kalmychkov Gennadiy
Khlystov Oleg
Kida Masato
Krylov Alexey
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