- Names
-
- F.-R. Orthous-Daunay
- E. Quirico
- P. Beck
- O. Brissaud
- E. Dartois
- T. Pino
- B. Schmitt
- Title
- Mid-infrared study of the molecular structure variability of insoluble organic matter from primitive chondrites
- Abstract
- Insoluble Organic Matter (IOM) found in primitive meteorites was formed in the Early Solar System and subsequently processed on the parent asteroids. The location, temporal sequence and processes of formation of this IOM are still a matter of debate. In particular, there is no consensus on the actual effect of post-accretional aqueous alteration processes on the chemical composition and structure of IOM. In the most primitive chondrites (types 1 and 2), these alterations have so far been either neglected or generically assigned to oxidation processes induced by fluid circulation. A series of IOM samples extracted from 14 chondrites with extensively documented post-accretional histories have been studied by infrared spectroscopy. Aqueous alteration shows no detectable effect on the chemical composition and structure of IOM within or across chondrite classes. Indeed, the most effective post-accretional process appears to be a high-temperature short-duration heating event and concerns essentially type 2 chondrites. In any case, post-accretional processes cannot account for all the chemical and structural variations of IOM. Chondrites from the CI, CR and CM classes accreted IOM precursors with moderately variable compositions, suggesting a chemical heterogeneity of the protosolar disk. The 3.4 μm band, and possibly its overtones and combinations in the near-infrared range, appear to be tracer(s) of the chemical class and possibly of surface heating processes triggered by impacts.
- Keywords
- chondrites, spectroscopy, IOM, IR, carbonaceous chondrites, meteorite Orgueil, meteorite Ivuna, meteorite Alais, meteorite PCA91008, meteorite Cold Bokkeveld, meteorite Murchison, meteorite Nogoya, meteorite QUE93005, meteorite Semarkona, meteorite Tagish Lake, meteorite Renazzo, meteorite QUE99177, meteorite EET92042
- Content
- spectral data, spectral data use, material-matter, planetary sciences
- Document type
- article
- Publication state
- published
- Doi
- 10.1016/j.icarus.2013.01.003
- Identifiers
- Publications
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- Bonal et al., 2006, Geochim. Cosmochim. Acta, 70, 1849 - 1863
- Bonal et al., 2007, Geochim. Cosmochim. Acta, 71, 1605 - 1623
- Quirico et al., 2003, Meteorit. Planet. Sci., 38, 795 - 811
- Quirico et al., 2005, Spectrochim. Acta, Part A, 61, 2368 - 2377
- Quirico et al., 2009, Earth Planet. Sci. Lett., 287, 185 - 193
- Orthous-Daunay et al., 2010, Earth Planet. Sci. Lett., 300, 321 - 328
- Quirico et al., 2005, Planet. Space Sci., 53, 1443 - 1448
- Quirico et al., 2011, Geochim. Cosmochim. Acta, 136, 3088 - 3102
- Dobrica et al., 2011, Meteorit. Planet. Sci., 46, 1363 - 1375