Document Detail


Striped iron zoning of olivine induced by dislocation creep in deformed peridotites.
MedLine Citation:
PMID:  11780058     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
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.
Authors:
J Ando; Y Shibata; Y Okajima; K Kanagawa; M Furusho; N Tomioka
Related Documents :
23710548 - Effective or just practical? an evaluation of an online postgraduate module on evidence...
24336438 - Demonstrating and assessing metered-dose inhaler-spacer technique: pediatric care provi...
24732098 - Collaborative virtual reality based advanced cardiac life support training simulator us...
23061188 - Developing reflective writing as effective pedagogy.
23163778 - The development of a family intervention competency assessment and reflection scale (fi...
8515918 - Comparison of problem-based and traditional education on student performance in the obs...
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:  -    
Affiliation:
Department of Earth and Planetary Systems Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan. ando@letitbe.geol.sci.hiroshima-u.ac.jp
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Folding-driven synthesis of oligomers.
Next Document:  Horses damp the spring in their step.