Coexistence of structure I and II gas hydrates in Lake Baikal suggesting gas sources from microbial and thermogenic origin

被引：78
|
作者：
Kida, Masato [1 ]
Khlystov, Oleg
Zemskaya, Tamara
Takahashi, Nobuo
Minami, Hirotsugu
Sakagami, Hirotoshi
Krylov, Alexey
Hachikubo, Akihiro
Yamashita, Satoshi
Shoji, Hitoshi
Poort, Jeffrey
Naudts, Lieven
机构：
[1] Kitami Inst Technol, Kitami, Hokkaido 0908507, Japan
[2] Russian Acad Sci, Siberian Branch, Limnol Inst, Irkutsk 664033, Russia
[3] Univ Ghent, Renard Ctr Marine Geol, B-9000 Ghent, Belgium
来源：
GEOPHYSICAL RESEARCH LETTERS | 2006年 / 33卷 / 24期
关键词：
D O I：
10.1029/2006GL028296
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
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.
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