Document Detail


Iron partitioning and density changes of pyrolite in Earth's lower mantle.
MedLine Citation:
PMID:  19965719     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
Phase transitions and the chemical composition of minerals in Earth's interior influence geophysical interpretations of its deep structure and dynamics. A pressure-induced spin transition in olivine has been suggested to influence iron partitioning and depletion, resulting in a distinct layered structure in Earth's lower mantle. For a more realistic mantle composition (pyrolite), we observed a considerable change in the iron-magnesium partition coefficient at about 40 gigapascals that is explained by a spin transition at much lower pressures. However, only a small depletion of iron is observed in the major high-pressure phase (magnesium silicate perovskite), which may be explained by preferential retention of the iron ion Fe3+. Changes in mineral proportions or density are not associated with the change in partition coefficient. The observed density profile agrees well with seismological models, which suggests that pyrolite is a good model composition for the upper to middle parts of the lower mantle.
Authors:
Tetsuo Irifune; Toru Shinmei; Catherine A McCammon; Nobuyoshi Miyajima; David C Rubie; Daniel J Frost
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-12-03
Journal Detail:
Title:  Science (New York, N.Y.)     Volume:  327     ISSN:  1095-9203     ISO Abbreviation:  Science     Publication Date:  2010 Jan 
Date Detail:
Created Date:  2010-01-08     Completed Date:  2010-01-26     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0404511     Medline TA:  Science     Country:  United States    
Other Details:
Languages:  eng     Pagination:  193-5     Citation Subset:  -    
Affiliation:
Geodynamics Research Center, Ehime University, Matsuyama 790-8577, Japan. irifune@dpc.ehime-u.ac.jp
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Comment In:
Science. 2010 Jan 8;327(5962):151-2   [PMID:  20056878 ]

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