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New insight into th...
New insight into the contributions of thermogenic processes and biogenic sources to the generation of organic compounds in hydrothermal fluids
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Konn, C. (författare)
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Testemale, D. (författare)
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Querellou, J. (författare)
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- Holm, Nils G. (författare)
- Stockholms universitet,Institutionen för geologiska vetenskaper
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Charlou, J. L. (författare)
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(creator_code:org_t)
- 2010-11-09
- 2011
- Engelska.
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Ingår i: Geobiology. - : Wiley. - 1472-4677 .- 1472-4669. ; 9:1, s. 79-93
- Relaterad länk:
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https://archimer.ifr...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Experiments on hydrothermal degradation of Pyrococcus abyssi biomass were conducted at elevated pressure (40 MPa) over a 200–450 °C temperature range in sapphire reaction cells. Few organic compounds could be detected in the 200 °C experiment. This lack was attributed to an incomplete degradation of P. abyssi cells. On the contrary, a wide range of soluble organic molecules were generated at temperatures ≥350 °C including toluene, styrene, C8–C16 alkyl-benzenes, naphthalene, C11–C16 alkyl-naphthalenes, even carbon number C12–C18 polycyclic aromatic hydrocarbons, C15–C18 alkyl-phenanthrenes and C8:0–C16:0 n-carboxylic acids. The effect of time on the final organic composition of the degraded P. abyssi solutions at 350 °C was also investigated. For that purpose the biomass was exposed for 10, 20, 60, 90, 270 and 720 min at 350 °C. We observed a similar effect of temperature and time on the chemical diversity obtained. In addition, temperature and time increased the degree of alkylation of alkyl-benzenes. This study offers additional evidence that a portion of the aliphatic hydrocarbons present in the fluids from the Rainbow ultramafic-hosted hydrothermal field may be abiogenic whereas a portion of the aromatic hydrocarbons and n-carboxylic acids may have a biogenic origin. We suggest that aromatic hydrocarbons and linear fatty acids at the Rainbow site may be derived directly from thermogenic alteration of material from the sub-seafloor biosphere. Yet we infer that the formation and dissolution of carboxylic acids in hydrothermal fluids may be controlled by other processes than in our experiments.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Annan geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Other Earth and Related Environmental Sciences (hsv//eng)
Nyckelord
- Hydrothermal geochemistry
- hydrothermal degradation
- Other earth sciences
- Övrig geovetenskap
- geokemi
- Geochemistry
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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