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| Titel |
Detailed Raman Spectroscopic Study of the Tissint Meteorite: Extraordinary Occurrence of High Pressure Polymorphs in a Single Fresh Piece of Martian Shergottite |
| VerfasserIn |
Ioannis Baziotis, Yang Liu, Lawrence Taylor |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250076727
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| Zusammenfassung |
| A recent (July 2011) witnessed fall of a Martian Shergottite, Tissint, has generated great
excitement for its pristine nature and its great scientific potential owing to its minimum
terrestrial contamination. In recent work, using detailed petrography, electron microprobe
method, micro-Raman Spectroscopy on serial sections, we investigated the presence of
high-pressure (Hi-P) polymorphs occurring in impact-melt pockets throughout our 10 gm
sample. Based upon the static and dynamic phase experimentation, we reconstructed the P-T-t
conditions for the formation of these many polymorphs (Baziotis et al., 2012, Nature
Comm.).
Tissint is an olivine-phyric shergottite, with large olivine grains (2000 Ë C. Furthermore, the large size of ringwoodite in
Tissint likely reflects prolonged shock durations. After heating, rapid cooling was
achieved in ~50 ms for the center of the melt pocket and ~20 ms for the rim of the
pocket, rendering conditions capable of preserving the high-P minerals observed. |
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