Newtonian Dislocation Creep in Quartzites: Implications for the Rheology of the Lower Crust

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Science  26 Aug 1994:
Vol. 265, Issue 5176, pp. 1204-1206
DOI: 10.1126/science.265.5176.1204


Mechanical and microstructural evidence indicates that a natural and a synthetic quartzite deformed by Newtonian dislocation (Harper-Dorn) creep at temperatures higher than 1073 K and stresses lower than 300 megapascals. The observation of this creep in these materials suggests that the lower crust may flow like a Newtonian viscous fluid by a dislocation mechanism at stresses much smaller than those previously postulated.