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How and why does olivine transform to spinel?
Author(s) -
Green Harry W.
Publication year - 1984
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl011i009p00817
Subject(s) - olivine , spinel , nucleation , geology , shear (geology) , mineralogy , melting point , phase transition , chemical physics , thermodynamics , mechanism (biology) , ion , materials science , chemistry , petrology , metallurgy , composite material , physics , organic chemistry , quantum mechanics
Recent conflicting results on the mechanism of the olivine‐spinel phase transition suggest that the mechanism varies with experimental conditions. Evidence for a shear‐induced mechanism is strong in experiments performed at temperatures far from the melting point or under conditions where very large shear stresses may be inferred. Where temperatures are closer to the melting point and stress concentrations probably less severe, the evidence favors a nucleation and growth mechanism. In one study, volume reduction accompanied anion restacking and significantly preceded cation reordering, suggesting a change in bonding between the two polymorphs.