Abstract
We conducted a series of experiments on granitoid cataclasites under mid-crustal conditions (Pc∼500 MPa, T=300 °C) and slow displacement rates (10−8 ms−1<ḋ<10−7 ms−1) i.e. within an order of magnitude of plate tectonic velocities. The samples reach high peak strength (1250<τ<1375 MPa) then weaken slightly (by ∼40 MPa) and continue to
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