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

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Molecular Indicators of Sources and Biodegradation of Organic Matter in Sediments of Fluid Discharge Zones of Lake Baikal. / Morgunova, Inna; Semenov, Petr; Kursheva, Anna; Litvinenko, Ivan; Malyshev, Sergey; Bukin, Sergey; Khlystov, Oleg; Pavlova, Olga; Zemskaya, Tamara; Krylov, Alexey A.

In: Geosciences (Switzerland), Vol. 12, No. 2, 72, 04.02.2022.

Research output: Contribution to journal › Article › peer-review

Author

Morgunova, Inna ; Semenov, Petr ; Kursheva, Anna ; Litvinenko, Ivan ; Malyshev, Sergey ; Bukin, Sergey ; Khlystov, Oleg ; Pavlova, Olga ; Zemskaya, Tamara ; Krylov, Alexey A. / Molecular Indicators of Sources and Biodegradation of Organic Matter in Sediments of Fluid Discharge Zones of Lake Baikal. In: Geosciences (Switzerland). 2022 ; Vol. 12, No. 2.

BibTeX

@article{11685b0d90974b1ebc18659ff93dddfe,

title = "Molecular Indicators of Sources and Biodegradation of Organic Matter in Sediments of Fluid Discharge Zones of Lake Baikal",

abstract = "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 in-cludes sites with gas and hydrothermal seepage, mud volcanoes with or without gas-oil fluid dis-charge, 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 allochtho-nous terrestrial and autochthonous microbial and algal sources. The studied sources, maturity and biodegradation parameters of organic matter vary significantly for areas with different fluid dis-charge. The composition of specific biomarkers including isoprenoids and immature hopanoids re-flects the lateral and vertical changes of microbial activity in sediments associated with various environmental conditions. The identified types of terpanes distribution (mature, mixed and imma-ture) correlate well with types of fluid discharge and attest to the development of various methano-genic 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.",

keywords = "Authigenic carbonates, Dispersed organic matter, Fluid discharge zones, Gas hydrates, Hydrocarbon molecular markers, Lake Baikal, Sediments, GAS HYDRATE, authigenic carbonates, N-ALKANES, hydrocarbon molecular markers, BEARING FLUIDS, OIL, METHANE, MICROBIAL COMMUNITIES, gas hydrates, fluid discharge zones, MUD VOLCANO, PORE WATERS, dispersed organic matter, BARENTS SEA, sediments, BOTTOM SEDIMENTS",

author = "Inna Morgunova and Petr Semenov and Anna Kursheva and Ivan Litvinenko and Sergey Malyshev and Sergey Bukin and Oleg Khlystov and Olga Pavlova and Tamara Zemskaya and Krylov, {Alexey A.}",

note = "Publisher Copyright: {\textcopyright} 2022 by the authors. Licensee MDPI, Basel, Switzerland.",

year = "2022",

month = feb,

day = "4",

doi = "10.3390/geosciences12020072",

language = "English",

volume = "12",

journal = "Geosciences (Switzerland)",

issn = "2076-3263",

publisher = "MDPI AG",

number = "2",

}

RIS

TY - JOUR

T1 - Molecular Indicators of Sources and Biodegradation of Organic Matter in Sediments of Fluid Discharge Zones of Lake Baikal

AU - Morgunova, Inna

AU - Semenov, Petr

AU - Kursheva, Anna

AU - Litvinenko, Ivan

AU - Malyshev, Sergey

AU - Bukin, Sergey

AU - Khlystov, Oleg

AU - Pavlova, Olga

AU - Zemskaya, Tamara

AU - Krylov, Alexey A.

PY - 2022/2/4

Y1 - 2022/2/4

N2 - 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 in-cludes sites with gas and hydrothermal seepage, mud volcanoes with or without gas-oil fluid dis-charge, 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 allochtho-nous terrestrial and autochthonous microbial and algal sources. The studied sources, maturity and biodegradation parameters of organic matter vary significantly for areas with different fluid dis-charge. The composition of specific biomarkers including isoprenoids and immature hopanoids re-flects the lateral and vertical changes of microbial activity in sediments associated with various environmental conditions. The identified types of terpanes distribution (mature, mixed and imma-ture) correlate well with types of fluid discharge and attest to the development of various methano-genic 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.

AB - 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 in-cludes sites with gas and hydrothermal seepage, mud volcanoes with or without gas-oil fluid dis-charge, 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 allochtho-nous terrestrial and autochthonous microbial and algal sources. The studied sources, maturity and biodegradation parameters of organic matter vary significantly for areas with different fluid dis-charge. The composition of specific biomarkers including isoprenoids and immature hopanoids re-flects the lateral and vertical changes of microbial activity in sediments associated with various environmental conditions. The identified types of terpanes distribution (mature, mixed and imma-ture) correlate well with types of fluid discharge and attest to the development of various methano-genic 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.

KW - Authigenic carbonates

KW - Dispersed organic matter

KW - Fluid discharge zones

KW - Gas hydrates

KW - Hydrocarbon molecular markers

KW - Lake Baikal

KW - Sediments

KW - GAS HYDRATE

KW - authigenic carbonates

KW - N-ALKANES

KW - hydrocarbon molecular markers

KW - BEARING FLUIDS

KW - OIL

KW - METHANE

KW - MICROBIAL COMMUNITIES

KW - gas hydrates

KW - fluid discharge zones

KW - MUD VOLCANO

KW - PORE WATERS

KW - dispersed organic matter

KW - BARENTS SEA

KW - sediments

KW - BOTTOM SEDIMENTS

UR - http://www.scopus.com/inward/record.url?scp=85124364382&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/74fdae10-477d-3772-803b-90655d21ab57/

U2 - 10.3390/geosciences12020072

DO - 10.3390/geosciences12020072

M3 - Article

AN - SCOPUS:85124364382

VL - 12

JO - Geosciences (Switzerland)

JF - Geosciences (Switzerland)

SN - 2076-3263

IS - 2

M1 - 72

ER -

ID: 93447822