Journal
LITHOSPHERE
Volume 2, Issue 6, Pages 418-422Publisher
GEOLOGICAL SOC AMER, INC
DOI: 10.1130/L97.1
Keywords
-
Categories
Funding
- Packard Foundation
- National Science Foundation [EAR-0409522]
Ask authors/readers for more resources
We present direct finite strain and rheological estimates of naturally deformed mantle materials using field observations in the Twin Sisters ultramafic body of Washington State. Folded and elongated (boudinaged or ductilely thinned) orthopyroxenite dikes within the host dunite provide strain markers that allow us to characterize the finite strain over an similar to 15,000 m(2) area. Using dynamic instability analysis on the folded orthopyroxenite dikes, orthopyroxene is calculated to have similar to 25 times the effective viscosity of olivine-rich host rocks (based on a power-law exponent of 3.0 for this dislocation creep process). Detailed mapping also indicates that inclusion of up to 15% orthopyroxene in the olivine-rich host rocks does not affect their viscosity, constraining the rheological behavior of two-phase, mantle material.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available