Solid-state 13C NMR characterization of insoluble organic matter from Antarctic CM2 chondrites

Evaluation of the meteoritic alteration level

Hikaru Yabuta, Hiroshi Naraoka, Kinya Sakanishi, Hiroyuki Kawashima

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Chemical structures of the insoluble organic matter (IOM) from the Antarctic CM2 chondrites (Yamato [Y-] 791198, 793321; Belgica, [B-] 7904; Asuka [A-] 881280, 881334) and the Murchison meteorite were analyzed by solid-state 13C nuclear magnetic resonance (NMR) spectroscopy. Different types of carbons were characterized, such as aliphatic carbon (Ali-C), aliphatic carbon linked to hetero atom (Hetero-Ali-C), aromatic carbon (Aro-C), carboxyls (COOR), and carbonyls (C=O). The spectra of the IOM from Murchison and Y-791198 showed two major peaks: Ali-C and Aro-C, while the spectra from the other meteorites showed only one major peak of Aro-C. Carbon distribution was determined both by manual integration and deconvolution. For most IOM, the Aro-C was the most abundant (49.8-67.8%) of all carbon types. When the ratios of Ali-C to Aro-C (Ali/Aro) were plotted with the atomic hydrogen to carbon ratio (H/C), a correlation was observed. If we use the H/C as a parameter for the thermal alteration event on the meteorite parent body, this result shows a different extent of thermal alteration. In addition, IOM with a lower Ali/Aro showed a lower ratio of Ali-C to COOR plus C=O (Ali/(COOR + C=O)). This result suggests that the ratio of CO moieties to aliphatic carbon in IOM might reflect chemical oxidation that was involved in hydrothermal alteration.

Original languageEnglish
Pages (from-to)779-787
Number of pages9
JournalMeteoritics and Planetary Science
Volume40
Issue number5
DOIs
Publication statusPublished - Jan 1 2005

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chondrites
chondrite
nuclear magnetic resonance
solid state
organic matter
evaluation
carbon
thermal alteration
meteorite
meteorite parent bodies
Murchison meteorite
parent body
magnetic resonance spectroscopy
meteorites
deconvolution
hydrothermal alteration

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Space and Planetary Science

Cite this

Solid-state 13C NMR characterization of insoluble organic matter from Antarctic CM2 chondrites : Evaluation of the meteoritic alteration level. / Yabuta, Hikaru; Naraoka, Hiroshi; Sakanishi, Kinya; Kawashima, Hiroyuki.

In: Meteoritics and Planetary Science, Vol. 40, No. 5, 01.01.2005, p. 779-787.

Research output: Contribution to journalArticle

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