A Post-Stishovite SiO 2 Polymorph in the Meteorite Shergotty: Implications for Impact Events-Reference-Cited by-同舟云学术

A Post-Stishovite SiO 2 Polymorph in the Meteorite Shergotty: Implications for Impact Events

Published:1999-05-28 Issue:5419 Volume:284 Page:1511-1513
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Sharp T. G.¹,Goresy A. El²,Wopenka B.³,Chen M.⁴

Affiliation:

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.

Abstract

Transmission electron microscopy and electron diffraction show that the martian meteorite Shergotty, a shocked achondrite, contains a dense orthorhombic SiO 2 phase similar to post-stishovite SiO 2 with the α-PbO 2 structure. If an SiO 2 mineral exists in Earth's lower mantle, it would probably occur in a post-stishovite SiO 2 structure. The presence of such a high-density polymorph in a shocked sample indicates that post-stishovite SiO 2 structures may be used as indicators of extreme shock pressures.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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