Effect of water on the rheology of experimentally deformed quartzite

P. S. Koch, J. M. Christie, A. Ord, R. P. George

Research output: Contribution to journalArticlepeer-review

121 Citations (Scopus)

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 languageEnglish
JournalJournal of Geophysical Research
Volume94
Issue numberB10
DOIs
Publication statusPublished - 1 Jan 1989
Externally publishedYes

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