A post-stishovite SiO2 polymorph in the meteorite Shergotty

Implications for impact events

Thomas Sharp, A. El Goresy, B. Wopenka, M. Chen

Research output: Contribution to journalArticle

110 Citations (Scopus)

Abstract

Transmission electron microscopy and electron diffraction show that the martian meteorite Shergotty, a shocked achondrite, contains a dense orthorhombic SiO2 phase similar to post-stishovite SiO2 with the α-PbO2 structure. If an SiO2 mineral exists in Earth's lower mantle, it would probably occur in a post-stishovite SiO2 structure. The presence of such a high-density polymorph in a shocked sample indicates that post-stishovite SiO2 structures may be used as indicators of extreme shock pressures.

Original languageEnglish (US)
Pages (from-to)1511-1513
Number of pages3
JournalScience
Volume284
Issue number5419
DOIs
StatePublished - May 28 1999

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Meteoroids
Transmission Electron Microscopy
Minerals
Shock
Electrons
Pressure

ASJC Scopus subject areas

  • General

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A post-stishovite SiO2 polymorph in the meteorite Shergotty : Implications for impact events. / Sharp, Thomas; El Goresy, A.; Wopenka, B.; Chen, M.

In: Science, Vol. 284, No. 5419, 28.05.1999, p. 1511-1513.

Research output: Contribution to journalArticle

Sharp, Thomas ; El Goresy, A. ; Wopenka, B. ; Chen, M. / A post-stishovite SiO2 polymorph in the meteorite Shergotty : Implications for impact events. In: Science. 1999 ; Vol. 284, No. 5419. pp. 1511-1513.
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