Graphitic Raman spectra in angrites: a source of high-temperature carbon?

Abernethy, F. A. J.; Anand, M.; Franchi, I. A. and Grady, M. M. (2013). Graphitic Raman spectra in angrites: a source of high-temperature carbon? In: 76th Annual Meeting of the Meteoritical Society, 29 Jul - 2 Aug 2013, Edmonton, Canada.

URL: http://www.hou.usra.edu/meetings/metsoc2013/pdf/51...

Abstract

Carbon, in varying quantities, has been identified by stepped combustion within many angrites. What is unclear is exactly where this carbon is located within the samples. In terrestrial samples, carbon is usually dissolved within silicate minerals as carbonate ions and potential indigenous carbonate has been found associated with several of the angrites. However while evidence for carbonates is present in our stepped combustion results, its release temperature is too low to account for the high temperature carbon component. Other possibilities for the component are graphite, as hypothesized in Angra dos Reis and found in some Martian meteorites, or uptake of dissociated C atoms. We have undertaken a systematic study of several samples by Raman spectroscopy to investigate the form of carbon in angrites.

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