Hydrogen and oxygen isotopic anomalies in pore waters suggesting clay mineral dehydration at gas hydrate-bearing Kedr mud volcano, southern Lake Baikal, Russia

Minami, Hirotsugu; Hachikubo, Akihiro; Sakagami, Hirotoshi; Kasashima, Ryo; Konishi, Masaaki; Hirano, Shoji; Takahashi, Naohiko; Pogodaeva, T. V.; Krylov, Alexey; Khabuev, Andrey V.; Kazakov, Andrey V.; Batist, Marc De; Naudts, L.; Chensky, A.G.; Gubin, N. A.; Khlystov, Oleg

doi:10.1007/s00367-018-0542-x

Cited by 9 publications

(9 citation statements)

References 32 publications

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“…The study of the southern basin included the sampling of sediments from the mud volcano Malenky (site 13, Figure 1, Table 1; [6,7,13,28,[48][49][50]) and gas hydrate-bearing sediments from the mud volcano Kedr (site 14, 15, Figure 1, Table 1; [49,51,52]). The former study of gas fluid from the MV Malenky [6] has suggested its possible migration from the deep strata.…”

Section: Geological Setting Of Lake Baikal Sampling Sitesmentioning

confidence: 99%

Molecular Indicators of Sources and Biodegradation of Organic Matter in Sediments of Fluid Discharge Zones of Lake Baikal

et al. 2022

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This paper performs a detailed study of a wide set of organic-geochemical proxies in 15 sediment cores collected from the main basins of Lake Baikal (the northern, the central and the southern) where processes of focused fluid discharge were detected. A variety of studied zones includes sites with gas and hydrothermal seepage, mud volcanoes with or without gas-oil fluid discharge, gas hydrates and authigenic carbonates. The composition of the dispersed organic matter and individual hydrocarbon molecular markers (n-alkanes, dimethyl alkanes, isoprenoids, steranes, terpanes and polycyclic aromatic hydrocarbons) testify to the input from predominantly allochthonous terrestrial and autochthonous microbial and algal sources. The studied sources, maturity and biodegradation parameters of organic matter vary significantly for areas with different fluid discharge. The composition of specific biomarkers including isoprenoids and immature hopanoids reflects the lateral and vertical changes of microbial activity in sediments associated with various environmental conditions. The identified types of terpanes distribution (mature, mixed and immature) correlate well with types of fluid discharge and attest to the development of various methanogenic and methanotrophic microbial communities in sediments. Moreover, the revealed specificity of microbial molecular markers distribution allowed us to suggest the fluid discharge processes in zones where they were not previously detected.

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Section: Geological Setting Of Lake Baikal Sampling Sitesmentioning

confidence: 99%

Molecular Indicators of Sources and Biodegradation of Organic Matter in Sediments of Fluid Discharge Zones of Lake Baikal

et al. 2022

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“…1 ) 9 , 19 . Recently, double-structure gas hydrates were also recovered at the Kedr MV, located in the southern Baikal basin, between 2015 and 2017 10 , 20 . This study focused on the characteristics of molecular and stable isotope compositions of hydrate-bound hydrocarbons retrieved at the Kedr MV area to improve our understanding of the formation process of double-structure gas hydrates.…”

Section: Introductionmentioning

confidence: 99%

“…The Kedr MV is located in the southern Baikal basin, at 27 km south of Listvyanka (Fig. 1), and it was separated into two study areas: a complex of mud-volcanic buildings (Kedr-1 area), where mud-volcanic breccia was found 20 , and a separate hill with gas hydrate in sediment (Kedr-2 area). Multi-beam echosounder data obtained in 2015 revealed that the Kedr MV consists of small mounds and pockmarks, and results of pore water geochemistry suggested the existence of fluid discharge from greater depths 20 .…”

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“…1), and it was separated into two study areas: a complex of mud-volcanic buildings (Kedr-1 area), where mud-volcanic breccia was found 20 , and a separate hill with gas hydrate in sediment (Kedr-2 area). Multi-beam echosounder data obtained in 2015 revealed that the Kedr MV consists of small mounds and pockmarks, and results of pore water geochemistry suggested the existence of fluid discharge from greater depths 20 . This part of Lake Baikal is known for the presence of the coal-bearing sediments of the Tankhoy Formation, Oligocene-Miocene age 21,22 .…”

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“…This part of Lake Baikal is known for the presence of the coal-bearing sediments of the Tankhoy Formation, Oligocene-Miocene age 21,22 . These deposits would represent an ideal source for upward migrating gas that could lead to the formation of gas hydrates near the lake floor 20,22 . During expeditions onboard R/V G. Yu.…”

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Characteristics of hydrate-bound gas retrieved at the Kedr mud volcano (southern Lake Baikal)

Hachikubo

Minami

Khabuev

et al. 2020

Sci Rep

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We reported the characteristics of hydrate-bound hydrocarbons in lake-bottom sediments at the Kedr mud volcano in Lake Baikal. Twenty hydrate-bearing sediment cores were retrieved, and methane-stable isotopes of hydrate-bound gases (δ13C and δ2H of − 47.8‰ to − 44.0‰ V-PDB and − 280.5‰ to − 272.8‰ V-SMOW, respectively) indicated their thermogenic origin accompanied with secondary microbial methane. Powder X-ray diffraction patterns of the crystals and molecular composition of the hydrate-bound gases suggested that structure II crystals showed a high concentration of ethane (around 14% of hydrate-bound hydrocarbons), whereas structure I crystals showed a relatively low concentration of ethane (2–5% of hydrate-bound hydrocarbons). These different crystallographic structures comprised complicated layers in the sub-lacustrine sediment, suggesting that the gas hydrates partly dissociate, concentrate ethane and form structure II crystals. We concluded that a high concentration of thermogenic ethane primarily controls the crystallographic structure of gas hydrates and that propane, iso-butane (2-methylpropane) and neopentane (2,2-dimethylpropane) are encaged into crystals in the re-crystallisation process.

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Exploring sediment porewater dissolved organic matter (DOM) in a mud volcano: Clues of a thermogenic DOM source from fluorescence spectroscopy

et al. 2019

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Hydrogen and oxygen isotopic anomalies in pore waters suggesting clay mineral dehydration at gas hydrate-bearing Kedr mud volcano, southern Lake Baikal, Russia

Cited by 9 publications

References 32 publications

Molecular Indicators of Sources and Biodegradation of Organic Matter in Sediments of Fluid Discharge Zones of Lake Baikal

Molecular Indicators of Sources and Biodegradation of Organic Matter in Sediments of Fluid Discharge Zones of Lake Baikal

Characteristics of hydrate-bound gas retrieved at the Kedr mud volcano (southern Lake Baikal)

Exploring sediment porewater dissolved organic matter (DOM) in a mud volcano: Clues of a thermogenic DOM source from fluorescence spectroscopy

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