Document Detail

Enhancement of cation diffusion rates across the 410-kilometer discontinuity in Earth's mantle
MedLine Citation:
PMID:  9888846     Owner:  NLM     Status:  Publisher    
Rates of cation diffusion (magnesium, iron, and nickel) have been determined in olivine and its high-pressure polymorph, wadsleyite, at 9 to 15 gigapascals and 1100 degrees to 1400 degreesC for compositions that are relevant to Earth's mantle. Diffusion in olivine becomes strongly dependent on composition at high pressure. In wadsleyite, diffusion is one to two orders of magnitude faster than in olivine, depending on temperature. Homogenization of mantle heterogeneities (chemical mixing) and mineral transformations involving a magnesium-iron exchange will therefore occur considerably faster in the transition zone than at depths of less than 410 kilometers.
Chakraborty; Knoche; Schulze; Rubie; Dobson; Ross; Angel
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Publication Detail:
Journal Detail:
Title:  Science (New York, N.Y.)     Volume:  283     ISSN:  1095-9203     ISO Abbreviation:  Science     Publication Date:  1999 Jan 
Date Detail:
Created Date:  1999-01-21     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0404511     Medline TA:  Science     Country:  -    
Other Details:
Languages:  Eng     Pagination:  362-5     Citation Subset:  -    
S. Chakraborty, Institut fur Mineralogie und Geochemie, Universit at zu Koln, Zulpicher Strasse 49B, 50674 Koln, Germany. R. Knoche, Institut fur Mineralogie und Petrographie, Universitat Innsbruck, Innrain 52, A-6020, Innsbruck, Austria. H. Sch.
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