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    A chemical sequence of macromolecular organic matter in the CM chondrites

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    Author
    Naraoka, H.
    Mita, H.
    Komiya, M.
    Yoneda, S.
    Kojima, H.
    Shimoyama, A.
    Issue Date
    2004-01-01
    Keywords
    Macromolecule
    organic matter
    Thermal alteration
    metamorphism
    CM chondrites
    
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    Citation
    Naraoka, H., Mita, H., Komiya, M., Yoneda, S., Kojima, H., & Shimoyama, A. (2004). A chemical sequence of macromolecular organic matter in the CM chondrites. Meteoritics & Planetary Science, 39(3), 401-406.
    Publisher
    The Meteoritical Society
    Journal
    Meteoritics & Planetary Science
    URI
    http://hdl.handle.net/10150/655812
    DOI
    10.1111/j.1945-5100.2004.tb00101.x
    Additional Links
    https://meteoritical.org/
    Abstract
    A new organic parameter is proposed to show a chemical sequence of organic matter in carbonaceous chondrites, using carbon, hydrogen, and nitrogen concentrations of solvent-insoluble and high-molecular weight organic matter (macromolecules) and the molecular abundance of solvent-extractable organic compounds. The H/C atomic ratio of the macromolecule purified from nine CM chondrites including the Murchison, Sayama, and seven Antarctic meteorites varies widely from 0.11 to 0.72. During the H/C change of ~0.7 to ~0.3, the N/C atomic ratio remains at ~0.04, followed by a sharp decline from ~0.040 to ~0.017 between H/C ratios from ~0.3 to ~0.1. The H/CN/ degrees C sequence shows different degrees of organic matter thermal alteration among these chondrites in which the smaller H/C-N/C value implies higher alteration levels on the meteorite parent body. In addition, solvent-extractable organic compounds such as amino acids, carboxylic acids, and polycyclic aromatic hydrocarbons are abundant only in chondrites with macromolecular H/C values >~0.5. These organic compounds were extremely depleted in the chondrites with a macromolecular H/C value of <~0.5. Possibly, most solvent-extractable organic compounds could have been lost during the thermal alteration event that caused the H/C ratio of the macromolecule to fall below 0.4.
    Type
    Article
    text
    Language
    en
    ISSN
    1945-5100
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1945-5100.2004.tb00101.x
    Scopus Count
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    Meteoritics & Planetary Science, Volume 39, Number 3 (2004)

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