Eutectoid phase transformation of olivine and spinel into perovskite and rock salt structures

Details Eutectoid phase transformation of olivine and spinel into perovskite and rock salt structures Eutectoid phase transformation of olivine and spinel into perovskite and rock salt structures

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.321..603p&link_type=abstract

Nature (ISSN 0028-0836), vol. 321, June 5, 1986, p. 603-605. CNRS-supported research.

Physics

20

Earth Mantle, Eutectics, Halites, Olivine, Perovskites, Phase Transformations, Spinel, Dislocations (Materials), Granular Materials, High Pressure, Microstructure, Mineralogy, Seismology

Scientific paper

Microstructural observations of the products of the transformation of (Mg, Fe)2SiO4 olivine and spinel and Ca2GeO4 olivine into magnesiowuesite, a transformation postulated to occur in the mantle. The transformation was achieved using a diamond anvil cell with a center pressure of about 400 kbar. The specimens were also heated with a YAG laser up to 2000 C to study the effects of various temperatures and pressures. The perovskite-structure materials obtained were examined by TEM techniques. The transformations to (Mg, Fe)O + (Mg, Fe)SiO3 obtained were identified as discontinuous, eutectoid processes typical of some metallic alloys, i.e., diffusion and a grain boundary reaction. A 10 percent volume decrease was obtained after transformation, and is believed associated with a high dislocation density in the magnesiowuesite. The Ca2GeO4 material exhibited a K2NiF2 structure which typified a transient local distortion in the specimens before (Mg, Fe)O + (Mg, Fe)SiO3 were obtained.

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