High-strain creep of feldspar rocks: Implications for cavitation and ductile failure in the lower crust

Details High-strain creep of feldspar rocks: Implications for cavitation and ductile failure in the lower crust High-strain creep of feldspar rocks: Implications for cavitation and ductile failure in the lower crust

Feb 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3504304r&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 4, CiteID L04304

Physics

13

Physical Properties Of Rocks: Plasticity, Diffusion, And Creep, Mineral Physics: Creep And Deformation, Structural Geology: High Strain Deformation Zones, Structural Geology: Rheology: Crust And Lithosphere (8159)

Scientific paper

Cavitation damage and ductile fracturing is a common phenomenon observed in high-temperature, ambient pressure deformation of superplastic metals and ceramics, but hardly described for geological materials. We performed high-pressure, high-temperature (400 MPa, 950°C-1200°C) torsion experiments on fine-grained (size ~4 μm, aspect ratio ~2.5) synthetic feldspar aggregates containing <3 vol% residual glass. Samples deformed at constant strain rates (~2 × 10-5 - 2 × 10-4 s-1) to high strain (~2.8-5.6) reveal strain hardening at the lower strain rates. Microstructures show pronounced cavitation and formation of porosity bands containing redistributed glass, presumably associated with grain boundary sliding and shape-preferred orientation of high-aspect ratio feldspar grains. Sudden failure by strain-induced nucleation, growth and coalescence of the cavities occurred in one-third of the samples before deformation was terminated. In natural mylonites cavitation damage may produce increased porosity enhancing fluid flow in high-temperature shear zones.

Affiliated with

Also associated with

No associations

Rating

High-strain creep of feldspar rocks: Implications for cavitation and ductile failure in the lower crust does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with High-strain creep of feldspar rocks: Implications for cavitation and ductile failure in the lower crust, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High-strain creep of feldspar rocks: Implications for cavitation and ductile failure in the lower crust will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1321307