BIOGENIC VS. ABIOGENIC ISOTOPE SIGNATURES OF REDUCED CARBON COMPOUNDS: A LESSON FROM HYDROTHERMAL SYNTHESIS EXPERIMENTS

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With growing interest in and demonstrated cases of inorganic hydrothermal synthesis of reduced or organic carbon compounds from CO and CO{sub 2}, it becomes crucial to establish geochemical criteria to distinguish reduced/organic carbon compounds of abiogenic origin from those of biogenic origin with overwhelming abundances on the surface and in subsurface of the Earth. Chemical and isotopic compositions, particularly {sup 13}C/{sup 12}C ratios, of reduced/organic carbon compounds have been widely utilized for deducing the origins and formation pathways of these compounds. An example is isotopic and C{sub 1}/(C{sub 2}+C{sub 3}) ratios of natural gases, which have been used to distinguish ... continued below

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Horita, J. June 13, 2001.

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With growing interest in and demonstrated cases of inorganic hydrothermal synthesis of reduced or organic carbon compounds from CO and CO{sub 2}, it becomes crucial to establish geochemical criteria to distinguish reduced/organic carbon compounds of abiogenic origin from those of biogenic origin with overwhelming abundances on the surface and in subsurface of the Earth. Chemical and isotopic compositions, particularly {sup 13}C/{sup 12}C ratios, of reduced/organic carbon compounds have been widely utilized for deducing the origins and formation pathways of these compounds. An example is isotopic and C{sub 1}/(C{sub 2}+C{sub 3}) ratios of natural gases, which have been used to distinguish bacterial, thermogenic, and possible abiogenic origins. Another example is that ancient graphitic carbon with {delta}{sup 13}C values c-25per thousand has been considered of biogenic origin. Although these criteria could be largely valid, growing data including those from our hydrothermal experiments suggest that a great caution must be exercised.

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  • V.M. Goldschmidt Conference, Hot Springs, VA (US), 05/20/2001

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  • Report No.: P01-110942
  • Grant Number: AC05-00OR22725
  • Office of Scientific & Technical Information Report Number: 787477
  • Archival Resource Key: ark:/67531/metadc718477

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  • June 13, 2001

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  • Sept. 29, 2015, 5:31 a.m.

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  • March 29, 2016, 4:06 p.m.

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Horita, J. BIOGENIC VS. ABIOGENIC ISOTOPE SIGNATURES OF REDUCED CARBON COMPOUNDS: A LESSON FROM HYDROTHERMAL SYNTHESIS EXPERIMENTS, article, June 13, 2001; Tennessee. (digital.library.unt.edu/ark:/67531/metadc718477/: accessed August 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.