Coexistence of structure I and II gas hydrates in Lake Baikal suggesting gas sources from microbial and thermogenic origin
Coexistence of structure I and II gas hydrates in Lake Baikal suggesting gas sources from microbial and thermogenic origin
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DOI：
10.1029/2006gl028296
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发表时间：
2006-12-16
影响因子：
5.2
通讯作者：
Naudts, Lieven
中科院分区：
文献类型：
--
作者：
Kida, Masato;Khlystov, Oleg;Naudts, Lieven
我们报告了在库库伊峡谷峡谷同一泥火山岩心中不同晶体结构的水合物沉积物的野外观察。我们将这些沉积物与天然气水合物结晶过程中的化学分馏联系起来。水合物样品的气体成分和晶体学分析揭示了两种不同的气源类型参与天然气水合物的形成，现在或过去：微生物（甲烷）和热（甲烷和乙烷）气体类型。首次在淡水沉积物中观察到的笼形结构II被认为是由热成因气体的更高混合形成的。
We report the field observation of hydrate deposits of different crystal structures in the same cores of a mud volcano in the Kukuy Canyon. We link those deposits to chemical fractionation during gas hydrate crystallization. Gas composition and crystallographic analyses of hydrate samples reveal involvement of two distinct gas source types in gas hydrate formation at present or in the past: microbial (methane) and thermogenic (methane and ethane) gas types. The clathrate structure II, observed for the first time in fresh water sediments, is believed to be formed by higher mixing of thermogenic gas.