Exsolution of Ca-clinopyroxene from orthopyroxene aided by deformation
Physics and Chemistry of Minerals
By: S. H. Kirby and M.A. Etheridge
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Abstract
Monoclinic calcium-poor shear-transformation lamellae and calcium-rich exsolution lamellae occur parallel to (100) in orthopyroxene. The formation of both structures from an orthopyroxene host involves a shear on (100) parallel to [001], with additional cation exchange in the exsolution case. The shear transformation involves a macroscopic simple shear angle of 13.3?? (shear strain of 0.236) and produces a specific a-axis orientation with respect to the sense of shear; we have found that this orientation dominates in exsolution lamellae in kinked orthopyroxene, where the sense of shear is known. In undeformed orthopyroxene, there is generally no preferred sense of orientation of the monoclinic a axes. We advance a specific model for exsolution involving nucleation and growth by shear transformation combined with cation exchange, thus circumventing the classical nucleation barrier and permitting exsolution at lower solute supersaturations. ?? 1981 Springer-Verlag.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Exsolution of Ca-clinopyroxene from orthopyroxene aided by deformation |
| Series title | Physics and Chemistry of Minerals |
| DOI | 10.1007/BF00308225 |
| Volume | 7 |
| Issue | 3 |
| Year Published | 1981 |
| Language | English |
| Publisher location | Springer-Verlag |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Physics and Chemistry of Minerals |
| First page | 105 |
| Last page | 109 |
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