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    Carbon isotope composition of organic compounds produced by abiotic synthesis under hydrothermal conditions

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    McCollom&Seewald_EPSL_Revised2.pdf (321.6Kb)
    Date
    2006-01-12
    Author
    McCollom, Thomas M.  Concept link
    Seewald, Jeffrey S.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/878
    As published
    https://doi.org/10.1016/j.epsl.2006.01.027
    Keyword
     Abiotic organic synthesis; Carbon isotopes; Hydrothermal systems; Origin of life 
    Abstract
    Although it is widely believed that production of organic compounds by Fischer-Tropsch synthesis and related processes occurs in many geologic environments, unambiguous identification of compounds with an abiotic origin in natural samples has been hampered by a lack of means to discriminate between abiotic compounds and organic matter from biological sources. While isotopic compositions might provide a means to discriminate between biologic and non-biologic sources of organic matter, there are few data presently available to constrain the isotopic composition of compounds produced by abiotic processes in geologic systems. Here, we report results of laboratory experiments conducted to evaluate the isotopic composition of organic compounds synthesized abiotically under hydrothermal conditions. We find the organic products are depleted in 13C to a degree typically ascribed to biological processes, indicating that carbon isotopic composition may not be a particularly effective diagnostic means to differentiate between biologic and non-biologic sources. Furthermore, our results suggest that the isotopic compositions of reduced carbon compounds found in many ancient rocks that have heretofore been attributed to biological sources could be consistent with an abiotic origin in a hydrothermal setting.
    Description
    Author Posting. © Elsevier B.V., 2006. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Earth and Planetary Science Letters 243 (2006): 74-84, doi:10.1016/j.epsl.2006.01.027.
    Collections
    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Preprint: McCollom, Thomas M., Seewald, Jeffrey S., "Carbon isotope composition of organic compounds produced by abiotic synthesis under hydrothermal conditions", 2006-01-12, https://doi.org/10.1016/j.epsl.2006.01.027, https://hdl.handle.net/1912/878
     

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