Size discontinuity between interstellar and chondritic aromatic structures; a high-resolution transmission electron microscopy study

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doi: 10.1016/j.gca.2005.02.029
Authors:Derenne, Sylvie; Rouzaud, J. N.; Clinard, C.; Robert, F.
Author Affiliations:Primary:
ENSCP, Laboratoire de Chimie Bioorganique et Organique Physique, Paris, France
Other:
Université d'Orléans, France
Museum National d'Histoire Naturelle, France
Volume Title:Geochimica et Cosmochimica Acta
Source:Geochimica et Cosmochimica Acta, 69(15), p.3911-3917. Publisher: Pergamon, Oxford, International. ISSN: 0016-7037
Publication Date:2005
Note:In English. 67 refs.; illus., incl. 1 table
Summary:Polyaromatic hydrocarbons (PAHs) are often considered as abundant and widespread organic structures in the universe and such structures are known to build the macromolecular network of the organic matter in carbonaceous chondrites. Assuming that interstellar PAHs are properly identified from infrared bands, these meteoritic aromatic moieties can be compared with their interstellar counterpart. The main structural parameters of the aromatic units of the insoluble organic matter of the Orgueil and Murchison chondrites are directly determined through high resolution transmission electron microscopy along with image analysis. These aromatic moieties appear weakly organized and of a smaller size than those present in the interstellar medium (containing ∼30 and ∼150 C atoms). Provided chondritic and interstellar polyaromatic hydrocarbons are derived from a similar organosynthesis, the smaller units were selectively preserved in meteorites, likely thanks to their fast accumulation on grains, which would protect them from solar UV photodissociation at the surface of the protosolar disk. Abstract Copyright (2005) Elsevier, B.V.
Sections:Meteorites and tektites
Subsections:Analytical geochemistry; Organic geochemistry
Subjects:Aromatic hydrocarbons; C-13; Carbon; Carbonaceous chondrites; Chemical composition; Chondrites; CI chondrites; CM chondrites; Cosmochemistry; Electromagnetic radiation; Geochemistry; Grain size; High-resolution methods; Hydrocarbons; Isotopes; Meteorites; Murchison Meteorite; NMR spectra; Organic compounds; Orgueil Meteorite; Polycyclic aromatic hydrocarbons; Size distribution; Solar radiation; Solar system; Spectra; Stable isotopes; Stony meteorites; TEM data; Ultraviolet radiation; Australasia; Australia; Europe; France; Tarn-et-Garonne France; Victoria Australia; Western Europe; Montauban France
Coordinates:S363700 S363700 E1451200 E1451200
N435300 N435300 E0012300 E0012300
Abstract Numbers:05M/3310
Record ID:2006035973
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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