A TEM and EELS study of carbon in a melt fragment from the Gardnos impact structure

Paula Lindgren* (Corresponding Author), Lydia Hallis, Fredrik S. Hage, Martin R. Lee, John Parnell, Anders Plan, Alistair Doye, Ian MacLaren

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

A carbon-rich melt fragment from the Gardnos impact structure has been studied for a better understanding of the preservation and structural form(s) of carbon that have been processed by impact melting. The carbon was analyzed in situ in its original petrographic context within the melt fragment, using high-resolution techniques including focused ion beam-transmission electron microscopy and electron energy loss spectroscopy. Results show that the carbon is largely uniform and has a nanocrystalline grain size. The Gardnos carbon has a graphitic structure but with a large c/a ratio indicating disorder. The disorder could be a result of rapid heating to high temperatures during impact, followed by rapid cooling, with not enough time to crystallize into highly ordered graphite. However, temperature distribution during impact is extremely heterogenous, and the disordered Gardnos carbon could also represent material that avoided extreme temperatures, and thus, it was preserved. Understanding the structure of carbon during terrestrial impacts is important to help determine if the history of carbon within extraterrestrial samples is impact related. Furthermore, the degree of preservation of carbon during impact is key for locating and detecting organic compounds in extraterrestrial samples. This example from Gardnos, together with previous studies, shows that not all carbon is lost to oxidation during impact but that impact melting can encapsulate and preserve carbon where it is available.

Original languageEnglish
Pages (from-to)2698-2709
Number of pages12
JournalMeteoritics and Planetary Science
Volume54
Issue number11
Early online date29 Aug 2019
DOIs
Publication statusPublished - 1 Nov 2019

Fingerprint

impact structure
transmission electron microscopy
fragments
melt
carbon
melting
disorders
organic compounds
graphite
organic compound
temperature distribution
grain size
energy dissipation
temperature
ion beams
spectroscopy
histories
electron energy
heating
cooling

Keywords

  • ENERGY-LOSS SPECTROSCOPY
  • SOUTHERN NORWAY
  • X-RAY
  • GRAPHITE
  • ROCKS
  • GEOCHEMISTRY
  • SUDBURY
  • CARBONIZATION
  • PRESERVATION
  • GERMANY

ASJC Scopus subject areas

  • Geophysics
  • Space and Planetary Science

Cite this

Lindgren, P., Hallis, L., Hage, F. S., Lee, M. R., Parnell, J., Plan, A., ... MacLaren, I. (2019). A TEM and EELS study of carbon in a melt fragment from the Gardnos impact structure. Meteoritics and Planetary Science, 54(11), 2698-2709. https://doi.org/10.1111/maps.13381

A TEM and EELS study of carbon in a melt fragment from the Gardnos impact structure. / Lindgren, Paula (Corresponding Author); Hallis, Lydia; Hage, Fredrik S.; Lee, Martin R.; Parnell, John; Plan, Anders; Doye, Alistair; MacLaren, Ian.

In: Meteoritics and Planetary Science, Vol. 54, No. 11, 01.11.2019, p. 2698-2709.

Research output: Contribution to journalArticle

Lindgren, P, Hallis, L, Hage, FS, Lee, MR, Parnell, J, Plan, A, Doye, A & MacLaren, I 2019, 'A TEM and EELS study of carbon in a melt fragment from the Gardnos impact structure', Meteoritics and Planetary Science, vol. 54, no. 11, pp. 2698-2709. https://doi.org/10.1111/maps.13381
Lindgren, Paula ; Hallis, Lydia ; Hage, Fredrik S. ; Lee, Martin R. ; Parnell, John ; Plan, Anders ; Doye, Alistair ; MacLaren, Ian. / A TEM and EELS study of carbon in a melt fragment from the Gardnos impact structure. In: Meteoritics and Planetary Science. 2019 ; Vol. 54, No. 11. pp. 2698-2709.
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