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  • 1 Eötvös Loránd University, Budapest, Hungary
  • 2 Max Planck Institute for Chemistry Department of Biogeochemistry, Mainz, Germany
  • 3 Department of Applied Physics, Okayama University of Science, Okayama, Japan
  • 4 Research Institute of Natural Sciences, Okayama University of Science, Okayama, Japan
  • 5 Research Institute for Solid State Physics and Optics, Hungarian Academy of Sciences, Budapest, Hungary
  • 6 Konkoly Thege Miklós Astronomical Institute, Research Centre for Astronomy and Earth Sciences Hungarian Academy of Sciences, Budapest, Hungary
  • 7 H-1117, Budapest, Pázmány Péter sétány 1/c., Hungary
  • 8 H-1121, Budapest, Konkoly-Thege Miklós u. 14, Hungary
  • 9 Hahn-Meitner Weg 1, D-55128, Mainz, Germany
  • 10 1-1 Ridai-cho, Okayama, 700-0005, Japan
  • 11 H-1525, Budapest, PO Box 49, Hungary
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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.

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