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Micro-Infrared Spectroscopy of Insoluble Organic Matter Extracted from Primitive Chondrites

Abstract : Most of the organic matter in primitive chondrites consists in Insoluble Organic Matter (IOM). Its polyaromatic structure and isotopic compositions are consistent with a presolar origin [1]. Similar polyaromatic compounds have been reported in IDPs [2], STARDUST grains and Micrometeorites. The search of such compounds in both Interstellar Medium and comets requires to determine the optical properties of IOMs and to find a link between their spectroscopic variations and their geological history. To date, it has been established that large isotopic, compositional and structural [3] variations of IOMs depend on post-accretion processes, and possibly heterogeneity in the accreted precursors. We measured mid-infrared spectra (4000-650 cm-1) at E.S.R.F. on ID21 beamline. IOMs were extracted with a HCl/HF attack by continuous filtration. The IOM was then flattened on a BaF2 window. Absorption spectra were acquired in transmission through a confocal microscope. IOMs from unmetamorphosed carbonaceous chondrites have typical spectra of kerogen-like compounds [4]. We will present a classification of IOMs extracted from 3 CI, 6 CM mostly based on aromatic, oxygenated and hydrogenated functions bands.
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Contributor : Béatrice Pibaret-Bourdon <>
Submitted on : Thursday, March 12, 2009 - 5:30:19 PM
Last modification on : Monday, January 4, 2021 - 3:58:31 PM


  • HAL Id : insu-00367914, version 1




François-Regis Orthous-Daunay, Eric Quirico, Pierre Beck, M. Rak, Bernard Schmitt. Micro-Infrared Spectroscopy of Insoluble Organic Matter Extracted from Primitive Chondrites. Paneth-Kolloquium 2008, Oct 2008, Nördlingen, Germany. ⟨insu-00367914⟩



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