A combined petrographic and micro-raman study of meteoritic microdiamond in ALH-77257 ureilite and ALH-78113 aubrite

Ildikó Gyollai, Arnold Gucsik, Miklós Veres, Margit Koós, Szabolcs Nagy, Szaniszló Bérczi

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2 Citations (Scopus)

Abstract

Two diamond-bearing meteorites (ALH-77257 and ALH-78113) were investigated by petrographic microscope and micro-Raman spectroscopy. The meteoritic diamonds can be found in fractures or veins cross-cutting the original minerals (olivine, pyroxene, feldspar) and inside the host minerals. The micro-Raman spectral features of microdiamonds in two studied meteorites are very similar to each other. The diamond peak was found at 1329 in ALH-77257 and 1332cm 1 in ALH-78113. Hexagonal diamond was not present. However, we observed the D and G bands of graphite or amorphous carbon at 1322 and 1582cm 1 wavenumbers, indicating an origin of the meteoritic microdiamonds by magmatic processes.

Original languageEnglish
Pages (from-to)151-155
Number of pages5
JournalSpectroscopy Letters
Volume45
Issue number2
DOIs
Publication statusPublished - Mar 1 2012

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Keywords

  • diamond
  • melt pockets
  • micro-Raman spectroscopy
  • ureilite

ASJC Scopus subject areas

  • Analytical Chemistry
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy

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