Document Detail

Striped iron zoning of olivine induced by dislocation creep in deformed peridotites.
MedLine Citation:
PMID:  11780058     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Deformation of solid materials affects not only their microstructures, but also their microchemistries. Although chemical unmixing of initially homogeneous multicomponent solids is known to occur during deformation by diffusion creep, there has been no report on their chemical zoning due to deformation by dislocation creep, in either natural samples or laboratory experiments. Here we report striped iron zoning of olivine ((Mg,Fe)2SiO4) in deformed peridotites, where the iron concentration increases at subgrain boundaries composed of edge dislocations. We infer that this zoning is probably formed by alignment of edge dislocations dragging a so-called Cottrell 'atmosphere' of solute atoms (iron in this case) into subgrain boundaries during deformation of the olivine by dislocation creep. We have found that the iron zoning does not develop in laboratory experiments of high strain rates where dislocations move too fast to drag the Cottrell atmosphere. This phenomenon might have important implications for the generation of deep-focus earthquakes, as transformation of olivine to high-pressure phases preferentially occurs in high-iron regions, and therefore along subgrain boundaries which would be preferentially aligned in plastically deformed mantle peridotites.
J Ando; Y Shibata; Y Okajima; K Kanagawa; M Furusho; N Tomioka
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Nature     Volume:  414     ISSN:  0028-0836     ISO Abbreviation:  Nature     Publication Date:    2001 Dec 20-27
Date Detail:
Created Date:  2002-01-07     Completed Date:  2002-01-31     Revised Date:  2003-10-31    
Medline Journal Info:
Nlm Unique ID:  0410462     Medline TA:  Nature     Country:  England    
Other Details:
Languages:  eng     Pagination:  893-5     Citation Subset:  -    
Department of Earth and Planetary Systems Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan.
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