Geochemistry of organic matter in bottom sediments of the Ashadze hydrothermal field

Morgunova, Inna; Ivanov, V.N.; Litvinenko, I. V.; Petrova, V. I.; Stepanova, T. V.; Cherkashev, G. A.

doi:10.1134/s0001437012030083

Cited by 9 publications

(6 citation statements)

References 11 publications

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“…The concentrations of phenanthrene and pyrene were also high, and about 10%-30% of ΣPAHs. This distribution was also discovered in hydrothermal sediments in the Andaman backarc basin of the Indian Ocean (Chernova et al, 1999(Chernova et al, , 2001Venkatesan et al, 2003), the Kairei hydrothermal field of the Indian Ridge (Li et al, 2012), and the Ashadze hydrothermal field (Morgunova et al, 2012) and the Logatchev hydrothermal field (Li et al, 2012) of the North Atlantic Ridge. On the contrary, the PAHs in sulfide deposits (Simoneit et al, 2004) and chimneys (Simoneit and Fetzer, 1996) of the Rainbow hydrothermal field of the North Atlantic Ridge were characterized by the high concentrations of heavy molecular mass PAHs (e.g., coronene) and only traces of low molecular mass PAHs.…”

Section: Resultsmentioning

confidence: 87%

“…The value of ΣPAHs ranged from 2.768 to 9.826 μg/g dry weight, which is higher than pelagic sediments on the Mid-Atlantic Ridge (260-445 ng/g) (Cui et al, 2008;Shao et al, 2010), and also higher than hydrothermal sediments in the Andaman backarc basin of the Indian Ocean (0.36-1.4 μg/g) (Venkatesan et al 2003) and the Ashadze hydrothermal field of the North Atlantic Ridge (about 0.1-0.3 μg/g) (Morgunova et al 2012). The sample 22V-TVG10 (9.826 μg/g) (Fig.…”

Section: Resultsmentioning

confidence: 95%

“…Because of high productivity and nutrition, the hydrothermal ecosystems were named "oasis" in sea floor (Yamanaka and Sakata, 2004;Li et al, 2011). Biomass and organic matter near seafloor hydrothermal areas were several orders of magnitude higher than pelagic abyssal areas (Yamanaka and Sakata, 2004;Morgunova et al, 2012). Because of the unique structural characteristics (cyclic conjugate structure), PAHs were stable at the high temperature.…”

Section: Resultsmentioning

confidence: 99%

“…hydrothermal field have been carried out, for example, in the Escanaba Trough on the southern Gorda Ridge (Kvenvolden et al, 1986;Rushdi and Simoneit, 2002b), the Middle Valley of the Juan de Fuca Ridge (Rushdi and Simoneit, 2002a), the Red Sea (Simoneit et al, 1987;Michaelis et al, 1990), the Andaman Basin (Chernova et al, 2001;Venkatesan et al, 2003), the Rainbow hydrothermal field (Simoneit et al, 2004;Konn et al, 2009), the Lost City hydrothermal field (Delacour et al, 2008;Konn et al, 2009), the Ashadze hydrothermal field (Morgunova et al, 2012), the Kairei hydrothermal field and the Logatchev hydrothermal field (Li et al, 2012) and so on. The concentrations of PAHs are compared between hydrothermal products and normal pelagic sediments by many researchers (Venkatesan et al, 2003;Morgunova et al, 2012).…”

mentioning

confidence: 99%

“…The concentrations of PAHs are compared between hydrothermal products and normal pelagic sediments by many researchers (Venkatesan et al, 2003;Morgunova et al, 2012). Venkatesan et al (2003) reported that the hydrothermal sediments in the Andaman backarc Basin of Indian Ocean contained 5-30 times more PAHs than pelagic sediments of the central Indian basin.…”

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confidence: 99%

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Component characteristics of polycyclic aromatic compounds in sediments of the South Mid-Atlantic Ridge

et al. 2014

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10 samples of sediments obtained from the South Mid-Atlantic Ridge were measured for the abundances and distributions of polycyclic aromatic compounds (PAHs). The total concentrations of PAHs (∑PAHs) ranged from 2.768 to 9.826 μg/g dry sediment. The ∑PAHs was higher in sample 22V-TVG10 and sample 26V-TVG05 which were close to hydrothermal fields, with the lowest value in sample 22V-TVG14 which was farthest from hydrothermal fields, suggesting a probable hydrothermal origin of ∑PAHs of samples. Approximately nine kinds of PAHs were identified, and low molecular mass tricyclic and tetracyclic aromatic compounds were predominant in the samples. The concentrations of fluoranthene which were typical as hydrothermal alteration compounds were the highest among PAHs with dry weight between 0.913-3.157 μg/g. The phenanthrene homologue was most abundant in the samples, and the ratios between parent phenanthrene and methylphenanthrene which probably reflected the degree of hydrothermal alteration ranged from 0.097 to 1.602. The sample 22V-TVG10 possessing a maximum ratio value showed the intense influence of the hydrothermal alteration on this sample, which might further imply that PAHs in sediments were mainly derived from the hydrothermal alteration.

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Section: Resultsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Component characteristics of polycyclic aromatic compounds in sediments of the South Mid-Atlantic Ridge

et al. 2014

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Hydrothermal Alteration Promotes Humic Acid Formation in Sediments: A Case Study of the Central Indian Ocean Basin

et al. 2018

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Anomalously high concentrations of humic‐rich dissolved organic matter (DOM) in extant submarine hydrothermal vent plumes traveled far from source are increasingly being reported. This DOM, able to mobilize trace metals (e.g., Fe2+) has been hypothesized as originating from organic matter produced by thermogenic bacteria. To eliminate a possible abiogenic origin of this DOM, study is required of well‐preserved organic compounds that can be attributed to thermogenic bacteria. The Central Indian Ocean Basin (CIOB) is part of a diffuse plate boundary and an intraplate deformation zone. Coarse fraction (>63 µ) characteristics, mineralogy, magnetic susceptibility, and geochemistry were examined in sediments of a core raised close to a north‐south fracture zone near the Equator. Two horizons of distinctly brown‐colored sediments were shown as hydrothermally altered from their charred fragments and geochemistry (CaCO3, Corg, Ti/Al, Al/(Al + Fe + Mn), Sr/Ba, Mg/Li, Mn micronodules, Fe/Mn). We examined whether humic substances were preserved in these sediments, and if so whether their carbon isotope distribution would support their hydrothermal origin. Alkali extraction of sediments afforded humic acids (HA) in yields up to 1.2% in the brown sediments. The remaining portions of the core had nil or low concentrations of HA. The carbon of hydrothermal HA is isotopically heavier (average δ13C, ∼ −16.3‰) compared to nonhydrothermal HA (–18.1‰), suggesting that they were probably formed from organic matter that remained after elimination of lighter carbon enriched functional groups during diagenesis. The results provide compelling evidence of HA formation from lipids originating from thermogenic bacteria.

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Distribution of fatty acids in the alpine grassland soils of the Qinghai-Tibetan Plateau

Dai

Zhu

Liu

et al. 2016

Sci. China Earth Sci.

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Geochemistry of organic matter in bottom sediments of the Ashadze hydrothermal field

Cited by 9 publications

References 11 publications

Component characteristics of polycyclic aromatic compounds in sediments of the South Mid-Atlantic Ridge

Component characteristics of polycyclic aromatic compounds in sediments of the South Mid-Atlantic Ridge

Hydrothermal Alteration Promotes Humic Acid Formation in Sediments: A Case Study of the Central Indian Ocean Basin

Distribution of fatty acids in the alpine grassland soils of the Qinghai-Tibetan Plateau

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