Natural Occurrence of MgSiO 3 -Ilmenite and Evidence for MgSiO 3 -Perovskite in a Shocked L Chondrite-Reference-Cited by-同舟云学术

Natural Occurrence of MgSiO 3 -Ilmenite and Evidence for MgSiO 3 -Perovskite in a Shocked L Chondrite

Published:1997-07-18 Issue:5324 Volume:277 Page:352-355
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Sharp Thomas G.¹²³⁴,Lingemann Cornelia M.¹²³⁴,Dupas Catherine¹²³⁴,Stöffler Dieter¹²³⁴

Affiliation:

1. T. G. Sharp, Department of Geology, Arizona State University, Tempe, AZ 85287–1404 USA.

2. C. M. Lingemann, Institut für Planetologie, Wilhelm- Klemm Str. 10, D-48149 Münster, Germany.

3. C. Dupas, Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany.

4. D. Stöffler, Museum für Naturkunde, Invaliden Str. 43, D-10115 Berlin, Germany.

Abstract

Shock-induced melt veins in the Acfer 040 L5-6 (S6) chondrite contain a previously unknown set of high pressure phases consisting of amorphous grains similar in composition to majorite, MgSiO 3 -ilmenite, and ringwoodite. The amorphous grains have compositions that are similar to those of synthetic MgSiO 3 -perovskites from chemically complex systems and are inferred to be MgSiO 3 -perovskite that crystallized from the melt at high pressure and temperature and subsequently amorphized after pressure release. The ilmenite represents a natural occurrence of a potentially important mineral in Earth's mantle. The MgSiO 3 -perovskite–MgSiO 3 -ilmenite–ringwoodite assemblage is not predicted by phase equilibria studies, but appears to result from crystallization of a melt at pressures above 26 gigapascals.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference45 articles.

1. E. A. Ringwood Composition and Petrology of the Earth's Mantle (McGraw-Hill International Series in the Earth and Planetary Sciences McGraw-Hill New York 1975) and references therein concerning synthesis of high-pressure minerals.

2. J. J. Gurney Diamonds in Kimberlites and Related Rocks vol. 2 Geol. Soc. Am. Spec. Publ. 14 Proc. 4th Int. Kimberlite Conf. (Blackwell Oxford 1989) p. 935.

3. Ringwoodite, Natural (Mg,Fe)2SiO4 Spinel in the Tenham Meteorite

4. Olivine-Garnet Transformation in a Meteorite

5. Smith J. V., Mason B., ibid. 168, 832 (1970).

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