Abstract
Empirical flow laws have been determined for Simpson quartzite samples deformed to mechanical steady state in the α-quartz stability field using Griggs-Blacic solid-medium deformation apparatus. Experiments were conducted on samples both as received ("dry') and with water added via the dehydration of a talc confining medium ("wet'). Best fits of the power law type yield a stress exponent of 2.72 ± 0.19, an activation enthalpy of 134 ± 32 kJ mol-1, and a preexponential constant of 1.16 [+1.15, -0.58] × 10-7 MPa-2.72s-1 for the dry quartzite law; and are 2.61 ± 0.15, 145 ± 17 kJ mol-1, and 5.05 [±5.00] × 10-6 MPa-2.61s-1 for the wet quartzite. The enhanced hydrolytic weakening of the wet experiments appears to affect the flow laws mostly in the preexponential constants, possibly as a defect concentration term that is higher in the wet than in the dry law. Recrystallization is well developed in the wet but not the dry specimens. -from Authors
| Original language | English |
|---|---|
| Journal | Journal of Geophysical Research |
| Volume | 94 |
| Issue number | B10 |
| Publication status | Published - 1 Jan 1989 |
| Externally published | Yes |
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Effect of water on the rheology of experimentally deformed quartzite. / Koch, P. S.; Christie, J. M.; Ord, A.; George, R. P.
In: Journal of Geophysical Research, Vol. 94, No. B10, 01.01.1989.Research output: Contribution to journal › Article
TY - JOUR
T1 - Effect of water on the rheology of experimentally deformed quartzite
AU - Koch, P. S.
AU - Christie, J. M.
AU - Ord, A.
AU - George, R. P.
PY - 1989/1/1
Y1 - 1989/1/1
N2 - Empirical flow laws have been determined for Simpson quartzite samples deformed to mechanical steady state in the α-quartz stability field using Griggs-Blacic solid-medium deformation apparatus. Experiments were conducted on samples both as received ("dry') and with water added via the dehydration of a talc confining medium ("wet'). Best fits of the power law type yield a stress exponent of 2.72 ± 0.19, an activation enthalpy of 134 ± 32 kJ mol-1, and a preexponential constant of 1.16 [+1.15, -0.58] × 10-7 MPa-2.72s-1 for the dry quartzite law; and are 2.61 ± 0.15, 145 ± 17 kJ mol-1, and 5.05 [±5.00] × 10-6 MPa-2.61s-1 for the wet quartzite. The enhanced hydrolytic weakening of the wet experiments appears to affect the flow laws mostly in the preexponential constants, possibly as a defect concentration term that is higher in the wet than in the dry law. Recrystallization is well developed in the wet but not the dry specimens. -from Authors
AB - Empirical flow laws have been determined for Simpson quartzite samples deformed to mechanical steady state in the α-quartz stability field using Griggs-Blacic solid-medium deformation apparatus. Experiments were conducted on samples both as received ("dry') and with water added via the dehydration of a talc confining medium ("wet'). Best fits of the power law type yield a stress exponent of 2.72 ± 0.19, an activation enthalpy of 134 ± 32 kJ mol-1, and a preexponential constant of 1.16 [+1.15, -0.58] × 10-7 MPa-2.72s-1 for the dry quartzite law; and are 2.61 ± 0.15, 145 ± 17 kJ mol-1, and 5.05 [±5.00] × 10-6 MPa-2.61s-1 for the wet quartzite. The enhanced hydrolytic weakening of the wet experiments appears to affect the flow laws mostly in the preexponential constants, possibly as a defect concentration term that is higher in the wet than in the dry law. Recrystallization is well developed in the wet but not the dry specimens. -from Authors
UR - http://www.scopus.com/inward/record.url?scp=0024937156&partnerID=8YFLogxK
M3 - Article
VL - 94
JO - Journal of Geophysical Research - Oceans
JF - Journal of Geophysical Research - Oceans
SN - 0148-0227
IS - B10
ER -