Shock and thermal annealing history of the ALH 77005 Martian meteorite: A micro-Raman spectroscopical investigation

Szabolcs Nagy, Sándor Józsa, Arnold Gucsik, Szaniszló Bérczi, Kiyotaka Ninagawa, Hirotsugu Nishido, M. Veres, Ãkos Kereszturi, Henrik Hargitai

Research output: Contribution to journalArticle

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Abstract

We studied optical microscopic and micro-Raman spectroscopic signatures of shocked olivine from the ALH 77005 Martian meteorite sample. The purpose of this study is to document pressure and temperature-related effects in olivine over the entire sample, which can aid in understanding structural changes due to shock metamorphism and the post-shock thermal annealing processes of lherzolitic Martian meteorites. According to the optical microscope observations, three areas may be discernible in olivine of the ALH 77005 in the vicinity of the melt pocket. The first area is the thermally undisturbed part of a grain, which contains a high density of shock-induced planar microdeformations such as Planar Deformation Features (PDFs) and Planar Fractures (PFs). Compared to the first area, the second area shows less shock-induced microstructures, while the third area is a strongly recrystallized region, but not formed from a melt.A common Raman spectral feature of these olivines is a regular doublet peak centered at 823 and 852 cm-1; additionally, two new peaks at 535 and 755 cm -1 appear in the weakly annealed transition zones.

Original languageEnglish
Pages (from-to)33-48
Number of pages16
JournalCentral European Geology
Volume55
Issue number1
DOIs
Publication statusPublished - Mar 1 2012

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Allan Hills meteorite
Martian meteorite
annealing
olivine
history
melt
shock metamorphism
structural change
transition zone
microstructure
temperature

Keywords

  • high pressure zeta phase
  • Martian meteorite
  • micro-Raman spectroscopy
  • olivine
  • shock metamorphism

ASJC Scopus subject areas

  • Geology

Cite this

Shock and thermal annealing history of the ALH 77005 Martian meteorite : A micro-Raman spectroscopical investigation. / Nagy, Szabolcs; Józsa, Sándor; Gucsik, Arnold; Bérczi, Szaniszló; Ninagawa, Kiyotaka; Nishido, Hirotsugu; Veres, M.; Kereszturi, Ãkos; Hargitai, Henrik.

In: Central European Geology, Vol. 55, No. 1, 01.03.2012, p. 33-48.

Research output: Contribution to journalArticle

Nagy, S, Józsa, S, Gucsik, A, Bérczi, S, Ninagawa, K, Nishido, H, Veres, M, Kereszturi, Ã & Hargitai, H 2012, 'Shock and thermal annealing history of the ALH 77005 Martian meteorite: A micro-Raman spectroscopical investigation', Central European Geology, vol. 55, no. 1, pp. 33-48. https://doi.org/10.1556/CEuGeol.55.2012.1.3
Nagy, Szabolcs ; Józsa, Sándor ; Gucsik, Arnold ; Bérczi, Szaniszló ; Ninagawa, Kiyotaka ; Nishido, Hirotsugu ; Veres, M. ; Kereszturi, Ãkos ; Hargitai, Henrik. / Shock and thermal annealing history of the ALH 77005 Martian meteorite : A micro-Raman spectroscopical investigation. In: Central European Geology. 2012 ; Vol. 55, No. 1. pp. 33-48.
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