Table 1.

Thermal and mechanical properties attributed to the GSZ amphibolite and the pseudotachylyte faults within them

ParameterDescriptionValueSource
ρdensity2809 kg m−3[a]
wpseudotachylyte width0.005 m
τshear stress on fault107–155 MPaSee Figure 7a
φratio of clasts to crystalline matrix0.11
Hlatent heat of melting135 213 J kg−1[a]
cPspecific heat1017 J kg−1 K−1[a]
Tmeltcoseismic melt temperature1023–1623 K[b]
Tambientambient host rock temperature518–618 K[c]
Gshear modulus49 GPa[d]

Obtained from [a] values for tremolite, anorthite and quartz in Robie et al. (1978); [b] melting temperatures for hornblende and oligoclase in Spray (2010); [c] geothermal gradient of 25°C km−1, modified from Droop et al. (1999); [d] values for hornblende, anorthite and quartz presented in Hacker et al. (2003) and originally sourced from Ohno (1995) and Holland & Powell (2004).