Abstract
Gas hydrate (GH) accumulation in subsurface sediments was discovered at shallow depth within the Malenkiy vent structure in the southern basin of Lake Baikal. The hydrated gas consists mainly of methane. Interstitial water chemistry indicates that water discharged within the study area is enriched with salts, especially Ca, Cl, and SO4 ions. The ascending water delivering gas into the GH stability zone is thought to be the main GH-forming fluid. Geochemical data together with noble gas isotopic ratios suggest that the GH in the subsurface sediments of Lake Baikal originated from a deep source of water with anomalous composition assumed to be derived from buried paleolakes. As a whole, the GH accumulation corresponds to the area of the Malenkiy structure and is represented by several small-scale GH occurrences coincident with local fluid discharge manifestations. It is filtrational in origin, related to fluid flow features and controlled by tectonic setting.
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Acknowledgments
We would like to thank A.F. Bobkov and V.A. Polyakov for analyses of water isotopic composition, and N.A. Lobkova for determination of GH gas composition. The authors would like to acknowledge the Scientific Party of the Baikal expedition-2000 for fruitful cooperation, and personally O. Khlystov (Irkutsk Limnological Institute SB RAS). The Russian Foundation for Basic Research has supported this work (projects 02-05-64346 and 02-0506321). We also wish to thank anonymous reviewers for their constructive comments and suggestions.
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Matveeva, T.V., Mazurenko, L.L., Soloviev, V.A. et al. Gas hydrate accumulation in the subsurface sediments of Lake Baikal (Eastern Siberia). Geo-Mar Lett 23, 289–299 (2003). https://doi.org/10.1007/s00367-003-0144-z
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DOI: https://doi.org/10.1007/s00367-003-0144-z