A post-stishovite SiO2 polymorph in the meteorite Shergotty: Implications for impact events

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

doi:10.1126/science.284.5419.1511

A post-stishovite SiO₂ polymorph in the meteorite Shergotty: Implications for impact events

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

Earth and Space Exploration, School of (SESE)

Research output: Contribution to journal › Article › peer-review

129 Scopus citations

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 language	English (US)
Pages (from-to)	1511-1513
Number of pages	3
Journal	Science
Volume	284
Issue number	5419
DOIs	https://doi.org/10.1126/science.284.5419.1511
State	Published - May 28 1999

ASJC Scopus subject areas

General

Access to Document

10.1126/science.284.5419.1511

Cite this

@article{30fdc144bbc148f69f342a08536eb457,

title = "A post-stishovite SiO2 polymorph in the meteorite Shergotty: Implications for impact events",

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.",

author = "Thomas Sharp and {El Goresy}, A. and B. Wopenka and M. Chen",

year = "1999",

month = may,

day = "28",

doi = "10.1126/science.284.5419.1511",

language = "English (US)",

volume = "284",

pages = "1511--1513",

journal = "Science",

issn = "0036-8075",

publisher = "American Association for the Advancement of Science",

number = "5419",

}

TY - JOUR

T1 - A post-stishovite SiO2 polymorph in the meteorite Shergotty

T2 - Implications for impact events

AU - Sharp, Thomas

AU - El Goresy, A.

AU - Wopenka, B.

AU - Chen, M.

PY - 1999/5/28

Y1 - 1999/5/28

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=0033612022&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0033612022&partnerID=8YFLogxK

U2 - 10.1126/science.284.5419.1511

DO - 10.1126/science.284.5419.1511

M3 - Article

C2 - 10348735

AN - SCOPUS:0033612022

SN - 0036-8075

VL - 284

SP - 1511

EP - 1513

JO - Science

JF - Science

IS - 5419

ER -

A post-stishovite SiO₂ polymorph in the meteorite Shergotty: Implications for impact events

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this