A chemical sequence of macromolecular organic matter in the CM chondrites

Hiroshi Naraoka, Hajime Mita, Masatoshi Komiya, Shigekazu Yoneda, Hideyasu Kojima, Akira Shimoyama

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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/C-N/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.

Original languageEnglish
Pages (from-to)401-406
Number of pages6
JournalMeteoritics and Planetary Science
Volume39
Issue number3
DOIs
Publication statusPublished - Jan 1 2004

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chondrites
organic compounds
chondrite
organic compound
macromolecules
thermal alteration
organic matter
meteorite
meteorite parent bodies
carbonaceous chondrites
carbonaceous chondrite
parent body
polycyclic aromatic hydrocarbons
meteorites
carboxylic acid
carboxylic acids
amino acids
molecular weight
PAH
amino acid

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Space and Planetary Science

Cite this

A chemical sequence of macromolecular organic matter in the CM chondrites. / Naraoka, Hiroshi; Mita, Hajime; Komiya, Masatoshi; Yoneda, Shigekazu; Kojima, Hideyasu; Shimoyama, Akira.

In: Meteoritics and Planetary Science, Vol. 39, No. 3, 01.01.2004, p. 401-406.

Research output: Contribution to journalArticle

Naraoka, Hiroshi ; Mita, Hajime ; Komiya, Masatoshi ; Yoneda, Shigekazu ; Kojima, Hideyasu ; Shimoyama, Akira. / A chemical sequence of macromolecular organic matter in the CM chondrites. In: Meteoritics and Planetary Science. 2004 ; Vol. 39, No. 3. pp. 401-406.
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