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Constraints from rocks in the Taiwan orogen on crustal stress levels and rheology

interval. We estimate a maximum strain rate of 7.0 � 10 � 14 s � 1 by distributing the geodetic convergence rate throughout a region homogeneously deformed under horizontal compression. These stress, strain rate and temperature estimates are consistent with the predictions of widely applied dislocation creep flow laws for quartzite. The samples record stress levels at the brittle-plastic transition, indicating a coefficient of friction (m) of 0.37 in the upper crust consistent with results based on critical taper. Integrated crustal strength of the Hsuehshan range amounts to 1.7 � 10 12 N/m based on our analysis, consistent with potential energy constraints based on topography. Other strength profiles are considered, however high crustal stresses (>300 MPa) conflict with our analysis. The study supports the use of the recrystallized grain size piezometer in quartz as a quick and inexpensive method for resolving stress histories in greenschist facies rocks. For consistency with the independent constraints presented here, we find it accurate to within +20%/� 40%, significantly better than previously recognized.