A chemical sequence of macromolecular organic matter in the CM chondrites

• Main Authors: NARAOKA, H., MITA, H., KOMIYA, M., YONEDA, S., KOJIMA, H., SHIMOYAMA, A.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Meteoritics & Planetary Science Archives 2004
• Subjects: Macromolecule;Organic matter;Thermal aleration;Metamorphism;CM chondrites; Antarctic; Murchison; Antarc*
• Online Access: https://journals.uair.arizona.edu/index.php/maps/article/view/14929

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/ 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