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Science 28 May 1999:
Vol. 284. no. 5419, pp. 1511 - 1513
DOI: 10.1126/science.284.5419.1511
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Reports
A Post-Stishovite SiO2 Polymorph in the Meteorite Shergotty: Implications for Impact Events
T. G. Sharp,
1*
A. El Goresy,
2
B. Wopenka,
3
M. Chen
4
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  -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.
1 Department of Geology, Arizona State
University, Tempe, AZ 85287, USA.
2 Max-Planck-Institut für Kernphysik, Post
Office Box 103 980, 69029 Heidelberg, Germany.
3 Department of Earth and Planetary Sciences,
Washington University, St. Louis, MO 63130, USA.
4 Guangzhou Institute of Geochemistry, Academie
Sinica, Guangzhou 510640, China.
*
To whom correspondence should be addressed.
Present address: Max-Planck-Institut für Chemie,
J.-Becher-Weg 27, 55128 Mainz, Germany.
Read the Full Text
THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
- Seifertite, a dense orthorhombic polymorph of silica from the Martian meteorites Shergotty and Zagami.
- A. El Goresy, P. Dera, T. G. Sharp, C. T. Prewitt, M. Chen, L. Dubrovinsky, B. Wopenka, N. Z. Boctor, and R. J. Hemley (2008)
European Journal of Mineralogy
20, 523-528
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- Recovery of stishovite-structure at ambient conditions out of shock-generated amorphous silica.
- O. Tschauner, S.-N. Luo, P. D. Asimow, and T. J. Ahrens (2006)
American Mineralogist
91, 1857-1862
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- Age and temperature of shock metamorphism of Martian meteorite Los Angeles from (U-Th)/He thermochronometry.
- (2004)
Geology
32, 677-680
- A new dense silica polymorph: A possible link between tetrahedrally and octahedrally coordinated silica.
- S.-N. Luo, S.-N. Luo, O. Tschauner, P. D. Asimow, and T. J. Ahrens (2004)
American Mineralogist
89, 455-461
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- From the Cover: Natural occurrence and synthesis of two new postspinel polymorphs of chromite.
- M. Chen, J. Shu, H.-k. Mao, X. Xie, and R. J. Hemley (2003)
PNAS
100, 14651-14654
| Abstract »
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- Characterization of a high-pressure phase of silica from the Martian meteorite Shergotty.
- P. Dera, C. T. Prewitt, N. Z. Boctor, and R. J. Hemley (2002)
American Mineralogist
87, 1018-1023
| Abstract »
| Full Text »
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- A Monoclinic Post-Stishovite Polymorph of Silica in the Shergotty Meteorite.
- A. E. Goresy, L. Dubrovinsky, T. G. Sharp, S. K. Saxena, and M. Chen (2000)
Science
288, 1632-1634
| Abstract »
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- Pressure-induced transformations in deep mantle and core minerals.
- R. J. Hemley, H. K. Mao, and S. A. Gramsch (2000)
Mineralogical Magazine
64, 157-184
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