Nanosized carbon-rich grains in carbonaceous chondrite meteorites

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Abstract

Macromolecular carbonaceous material is common in primitive meteorites. Little information exists on its form and composition, and there are no published data on nanometer-scale chemical and structural variations. Transmission electron microscopy (TEM) studies of CM meteorites reveal abundant, previously unrecognized nanosized carbonaceous grains. They have a high aromatic component as revealed by electron energy-loss spectroscopy (EELS), with up to 20 at.% substituted by S, N, and O. They occur as discrete hollow and solid nanospheres and sparse nanotubes. The grains exhibit considerable variations in composition, size, morphology, and abundance among meteorites and may represent materials from multiple reservoirs.

Original languageEnglish (US)
Pages (from-to)431-439
Number of pages9
JournalEarth and Planetary Science Letters
Volume224
Issue number3-4
DOIs
StatePublished - Aug 15 2004

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Keywords

  • Carbonaceous chondrites
  • Carbonaceous material
  • EELS
  • Nanometer-scale variations
  • TEM

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

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