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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.
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Submitted on : Monday, October 24, 2011 - 9:58:15 AM
Last modification on : Monday, November 23, 2020 - 1:50:03 PM

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E. Dobrica, C. Engrand, E. Quirico, G. Montagnac, J. Duprat. Raman characterization of carbonaceous matter in CONCORDIA Antarctic micrometeorites. Meteoritics and Planetary Science, Wiley, 2011, 46, pp.1363-1375. ⟨10.1111/j.1945-5100.2011.01235.x⟩. ⟨in2p3-00634834⟩

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