Publication
- Names
-
- E. Dobrica
- C. Engrand
- E. Quirico
- G. Montagnac
- J. Duprat
- Title
- Raman characterization of carbonaceous matter in CONCORDIA Antarctic micrometeorites
- Abstract
- We report a multi-wavelength Raman spectroscopy study of carbonaceous matter in 38 Antarctic micrometeorites (AMMs) from the 2006 CONCORDIA collection. The particles were selected as a function of their degree of thermal alteration developed during the deceleration in the atmosphere. These samples range from unmelted (fine-grained—Fg; ultracarbonaceous—UCAMMs) to partially melted AMMs (scorias—Sc) and completely melted particles (cosmic spherules—CS). More than half of the analyzed AMMs contain a substantial amount of polyaromatic carbonaceous matter with a high degree of disorder. The proportion of particles where carbon is not detected increase from the Fg to the Fg-Sc and to the Sc-AMMs, and no carbon is detected in CS. In addition, the spectral characteristics of the G and D bands of the carbonaceous matter in Sc-AMMs plot apart from the trend formed by the data from Fg-AMMs and UCAMMs. These results suggest that oxidation processes occurred during the deceleration of the particles in the atmosphere. In Fg-AMMs and UCAMMs, the spectral characteristics of the G and D bands reveal the high degree of disorder of the carbonaceous matter, precluding a long duration thermal metamorphism on the parent body and suggesting that AMMs have a connection with C1-C2 chondrites. The Raman parameters of the deuterium-rich carbonaceous matter of UCAMMs do not differ from that of Fg-AMMs. Using a 244 nm excitation, we detected the cyanide (-CN) functional group for the first time in a UCAMM, reinforcing the likely cometary origin of this type of micrometeorites.
- Keywords
- micrometeorites, Raman spectra, cyanide functional group, CI chondrites, CM chondrites
- Content
- material-matter, planetary sciences, spectral data
- Year
- 2011
- Journal
- Meteoritics and Planetary Science
- Volume
- 46
- Number
- 9
- Pages
- 1363 - 1375
- Pages number
- 13
- Document type
- article
- Publication state
- published
- Doi
- 10.1111/j.1945-5100.2011.01235.x
- Identifiers