Phase Transformation Under Stress and Volume Transfer Creep
- B.E. Hobbs and
- H.C. Heard
Published Online: 18 MAR 2013
Copyright 1986 by the American Geophysical Union.
Mineral and Rock Deformation: Laboratory Studies: The Paterson Volume
How to Cite
Green, H. W. (1986) Phase Transformation Under Stress and Volume Transfer Creep, in Mineral and Rock Deformation: Laboratory Studies: The Paterson Volume (eds B.E. Hobbs and H.C. Heard), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM036p0201
- Published Online: 18 MAR 2013
- Published Print: 1 JAN 1986
Print ISBN: 9780875900629
Online ISBN: 9781118664353
- Rocks—Testing—Addresses, essays, lectures;
- Rock deformation—Addresses, essays, lectures
Experiments in which Mg2GeO4 transformed from the olivine structure to the spinel structure under nonhydrostatic stress display microstructures that are consistent with Kamb's generalization of Gibbs' concept of chemical potential. The thermodynamic theory is extended here to treat phase transformations under stress. It is shown that the resulting anisotropy of Free Enthalpy is describable in terms of a second-rank tensor, the Free Enthalpy indicatrix. Application of the theory to the Mg2GeO4 experiments shows that it predicts very well the observed microstructures and that it predicts a new flow mechanism, volume-transfer creep. It is suggested that volume-transfer creep could be important in association with phase transitions in the earth's mantle.