Shallow-rooted mud volcanism in Lake Baikal

Khlystov, Oleg; Poort, Jeffrey; Mazzini, Adriano; Ахманов, Г.Г.; Minami, Hirotsugu; Hachikubo, Akihiro; Khabuev, Andrey V.; Kazakov, Andrey V.; Batist, Marc De; Naudts, L.; Chensky, A.G.; Vorob'eva, S. S.

doi:10.1016/j.marpetgeo.2019.01.005

Cited by 18 publications

(9 citation statements)

References 31 publications

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“…Lake Baikal is the world's only freshwater reservoir where gas hydrates (GH) are found, and it describes more than 50 geological structures that differ in the composition of the discharged fluids [51,52]. In deep sediments near GH, the rate of AOM ranged from 35 to 273.2 µL CH 4 /(dm 3 day) [53], increasing at depths of 20-60 cm, which may indicate the functioning of the anaerobic community of microorganisms [54][55][56].…”

Section: Introductionmentioning

confidence: 99%

Diversity of NC10 Bacteria and ANME-2d Archaea in Sediments of Fault Zones at Lake Baikal

et al. 2019

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Anaerobic oxidation of methane (AOM) reduces methane emissions from marine ecosystems, but we know little about AOM in freshwater reservoirs. Lake Baikal is the world’s only freshwater reservoir where gas hydrates (GH) are found. Despite that AOM has been demonstrated in deep sediments of Lake Baikal did not reveal methane-oxidizing archaea ANME1, 2, or 3, which are responsible for AOM in marine sediments. A search for representatives Candidatus Methylomirabilis oxyfera (M. oxyfera)-like bacteria (NC10) and Candidatus Methanoperedens nitroreducens (M. nitroreducens)-like archaea (ANME-2d) has been carried out in the different types of Lake Baikal methane enriched sediments. We used different molecular biology methods including high-throughput sequencing and PCR analysis, using 16S rRNA genes as well as different functional genes of AOM (mcrA and pmoA). We found diverse M. oxyfera-like bacteria and M. nitroreducens-like archaea in various geological structures in Lake Baikal (methane seep and mud volcano), which were different from the composition of the discharged fluid. We also considered possible electron acceptors for this process in the sediments of Lake Baikal.

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Section: Introductionmentioning

confidence: 99%

Diversity of NC10 Bacteria and ANME-2d Archaea in Sediments of Fault Zones at Lake Baikal

et al. 2019

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“…In Lake Baikal, the presence of mud volcanoes is directly associated with the destruction of gas hydrates at the lower boundary of their stability zone (not deeper than 450 m below the bottom) due to tectonic activity and the influx of warm fluids rather than with the overburden pressure areas at depths of several kilometres, as shown for marine and terrestrial mud volcanoes. Owing to this, we substantiated a previously unknown type of mud volcanism with shallow roots, which was called a Baikal type (Khlystov et al, 2019).…”

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confidence: 64%

Results of 20 years of searching and studying gas hydrates in Lake Baikal

Khlystov

2020

LFWB

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For more than 50 years, a comprehensive study of natural gas hydrates has been conducting in the World Ocean. Their deep and near-surface (sub-bottom) accumulations are distinguished. All of them were discovered on the seabed in the zones of sedimentation and oil and gas generation depocentres. Along the tectonic faults that control near-surface accumulations of gas hydrates, there are discharges of gas and gas-saturated fluids in seeps and mud volcanoes. Mechanisms of formation of gas hydrates and geological structures interconnected with each other were determined. All known gas-hydrate crystal structures (SI, SII, H) that are formed, depending on the structure and composition of gases, were discovered

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“…Beside them, we were compared our results with (Khlystov et al, 2019) existing ideas about mud volcanism in the area of the Academic ridge mud volcanoes complex and we believe that the mud volcanoes of other areas have a similar origin.…”

Section: Resultsmentioning

confidence: 97%