Abstract
A driving potential for metamorphic differentiation in the development of a crenulation cleavage arises from the difference in the mean stresses acting on the mobile solid phase in the hinge and limb regions of a crenulation. The rate of metamorphic differentiation is proportional to the resulting difference in the mean chemical potential of the solid in fluid-filled pores in the two regions. A comparison of the magnitude of the rate of dilation, representing the addition of the mobile phase (quartz) to the hinge region of a crenulation fold, with the total strain rate indicates when differentiation will be important in natural and experimental settings. Dilation rates comparable to tectonic strain rates of 10-1 to 10-14 sec-1 are achieved in pelitic rocks at stress differences of 10 to 40 b.
Original language | English (US) |
---|---|
Pages (from-to) | 185-187 |
Number of pages | 3 |
Journal | Geology |
Volume | 5 |
Issue number | 3 |
DOIs | |
State | Published - 1977 |
All Science Journal Classification (ASJC) codes
- Geology