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

• Kida, Masato

• Khlystov, Oleg

• Zemskaya, Tamara

• Takahashi, Nobuo

• Minami, Hirotsugu

• Sakagami, Hirotoshi

• Krylov, Alexey

• Hachikubo, Akihiro

• Yamashita, Satoshi

• Shoji, Hitoshi

• Poort, Jeffrey

• Naudts, Lieven

Abstract

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.

An edited version of this paper was published by AGU. Copyright 2006 American Geophysical Union.

Journal

• GEOPHYSICAL RESEARCH LETTERS

  GEOPHYSICAL RESEARCH LETTERS 33 (L24603), 1-4, 2006

  The American Geophysical Union

Keywords

• hydrate
• structure II
• Lake Baikal

Details

• CRID: 1050001338808028928
• NII Article ID: 120002830252
• Web Site: https://kitami-it.repo.nii.ac.jp/records/7276
• Text Lang: en
• Article Type: journal article
• Data Source:
  • IRDB
  • CiNii Articles