Physics
Scientific paper
Nov 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30usde3s&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 21, pp. SDE 3-1, CiteID 2088, DOI 10.1029/2003GL018444
Physics
23
Mineral Physics: Creep And Deformation, Physical Properties Of Rocks: Plasticity, Diffusion, And Creep, Structural Geology: Microstructures, Tectonophysics: Rheology-Crust And Lithosphere, Tectonophysics: Stresses-Crust And Lithosphere
Scientific paper
In order to determine a recrystallized grain size piezometer for quartz, we deformed Black Hills quartzite in a molten salt assembly in a Griggs apparatus at 1.5 GPa, 800 to 1100°C, and strain rates between 2*10-7 and 2*10-4 s-1, conditions which include dislocation creep regimes 2 and 3 of Hirth and Tullis [1992]. Flow stresses ranged from 34 +/- 16 to 268 +/- 38 MPa with corresponding recrystallized grain sizes from 46 +/- 15 to 3.2 +/- 0.7 μm. The data are well fit by a single piezometer relation, D = 103.56+/- 0.27 * σ-1.26 +/- 0.13, with no change in slope at the regime 2-3 transition and no effect of temperature or α/β stability field. Another experimental piezometer relation for regime 1 of Hirth and Tullis [1992] differs in slope, suggesting that different recrystallization mechanisms require different piezometer calibrations.
Stipp Michael
Tullis Jan
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