The orthoenstatite to clinoenstatite transformation by shearing and reversion by annealing: Mechanism and potential applications
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Abstract
Clinoenstatite (CE) was produced by deforming single-crystal specimens of ortho-enstatite (OE) in several different sorta of experiments. Examination with light and trans-mission electron microscopes shows that the transformation is coherent and involves a macroscopic shear on (100) [001] through an angle of 12.8±1.3 °, in good agreement with the theoretically expected value of 13.3 °, and that the transformation is accomplished by glide on (100) of partial dislocations with b= 0.83[001]. Structural analysis provides further insight into the transformation mechanism. Reversion occurs in specimens annealed under a variety of conditions, and thin lamellae of CE in unconstrained, low-strain specimens recover their original shape during transformation back to OE. Our experiments and thermodynamic estimates both suggest that the equilibrium transition temperature is raised roughly 300 ° C per kilobar of shear stress on (100) [001]. This provides the basis of a method by which it may be possible to determine the magnitude as well as the orientation of the principal stresses that produce CE in nature during deformation of enstatite-bearing rocks.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | The orthoenstatite to clinoenstatite transformation by shearing and reversion by annealing: Mechanism and potential applications |
| Series title | Contributions to Mineralogy and Petrology |
| DOI | 10.1007/BF00378000 |
| Volume | 52 |
| Issue | 1 |
| Year Published | 1975 |
| Language | English |
| Publisher | Springer |
| Contributing office(s) | Earthquake Science Center |
| Description | 27 p. |
| First page | 29 |
| Last page | 55 |
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