determine the influence of water and pressure. We analyse the data from low pressure (P=
0.1 MPa and 0.1–0.3 GPa) high-resolution experiments as well as the results from higher
pressures (2 to 6 GPa) containing larger uncertainties, using a flow law of the form ε ̇ i= ε ̇
i dry+ ε ̇ i wet with (i: slip system). The data are normalized to a common stress (150 MPa)
and temperature (1573 K) and we determine the parameters water content exponent (r) and …