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Coexistence of structure I and II gas hydrates in Lake Baikal suggesting gas sources from microbial and thermogenic origin
Author(s) -
Kida Masato,
Khlystov Oleg,
Zemskaya Tamara,
Takahashi Nobuo,
Minami Hirotsugu,
Sakagami Hirotoshi,
Krylov Alexey,
Hachikubo Akihiro,
Yamashita Satoshi,
Shoji Hitoshi,
Poort Jeffrey,
Naudts Lieven
Publication year - 2006
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2006gl028296
Subject(s) - clathrate hydrate , methane , hydrate , gas composition , geology , mineralogy , natural gas , crystallization , fractionation , canyon , chemical composition , geochemistry , environmental chemistry , chemistry , geomorphology , thermodynamics , physics , organic chemistry
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.