Model of formation of double structure gas hydrates in Lake Baikal based on isotopic data
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概要
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We measured the isotopic compositions of methane(C1) and ethane (C2) of hydrate-bound gas and of dissolvedgas in pore water retrieved from bottom sediments in LakeBaikal. Both structure I (sI:3%C2) and II (sII:14%C2) gashydrates are observed in the same sediment cores in KukuyK-2 mud volcano. We found that C2 dD of sI gas hydrate islarger than that of sII, whereas C1 d13C, C1 dD and C2 d13Cvalues are practically the same in both hydrate structures.d13C of C1 and C2 of hydrate-bound gas are several permilsmaller than those in pore water, showing that the currentpore water is not the source of gas hydrates. These findingslead to a new model where the sII gas hydrates were formedprior to the sI hydrates.
- American Geophysical Unionの論文
American Geophysical Union | 論文
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