Publication Type Journal Article
Title The amino acid and hydrocarbon contents of the Paris meteorite: Insights into the most primitive CM chondrite
Authors Zita Martins Paola Modica Brigitte Zanda Louis Le Sergeant D Hendecourt
Groups
Journal METEORITICS \& PLANETARY SCIENCE
Year 2015
Month May
Volume 50
Number 5
Pages 926-943
Abstract The Paris meteorite is one of the most primitive carbonaceous chondrites. It is reported to be the least aqueously altered CM chondrite, and to have experienced only weak thermal metamorphism. We have analyzed for the first time the amino acid and hydrocarbon contents of this pristine meteorite by gas chromatography-mass spectrometry (GC-MS). When plotting the relative amino acids abundances of several CM chondrites according to the increasing hydrothermal scale (petrologic subtypes), from the CM2.7/2.8 Paris to the CM2.0 MET 01070, Paris has the lowest relative abundance of beta-alanine/glycine (0.15), which fits with the relative abundances of beta-alanine/glycine increasing with increasing aqueous alteration for CM chondrites. These results confirm the influence of aqueous alteration on the amino acid abundances and distribution. The amino acid analysis shows that the isovaline detected in this meteorite is racemic (D/L = 0.99 +/- 0.08; L-enantiomer excess = 0.35 +/- 0.5\%; corrected D/L = 1.03; corrected L-enantiomer excess = -1.4 +/- 2.6\%). The identified hydrocarbons show that Paris has n-alkanes ranging from C-16 to C-25 and 3- to 5-ring nonalkylated polycyclic aromatic hydrocarbons (PAHs). The lack of alkylated PAHs in Paris seems to be also related to this low degree of aqueous alteration on its parent body. The extraterrestrial hydrocarbon content, suggested by the absence of any biomarker, may well have a presolar origin. The chemistry of the Paris meteorite may thus be closely related to the early stages of the solar nebula with a contribution from interstellar (molecular cloud) precursors.
DOI http://dx.doi.org/10.1111/maps.12442
ISBN
Publisher
Book Title
ISSN 1086-9379
EISSN 1945-5100
Conference Name
Bibtex ID ISI:000354258400007
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