A chemical sequence of macromolecular organic matter in the CM chondrites

Details A chemical sequence of macromolecular organic matter in the CM chondrites A chemical sequence of macromolecular organic matter in the CM chondrites

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004m%26ps...39..401n&link_type=abstract

Meteoritics & Planetary Science, Vol. 39, No. 3, p.401-406

Computer Science

11

Scientific paper

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 <~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.

Affiliated with

Also associated with

No associations

Rating

A chemical sequence of macromolecular organic matter in the CM chondrites does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A chemical sequence of macromolecular organic matter in the CM chondrites, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A chemical sequence of macromolecular organic matter in the CM chondrites will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1644434