Mx. Zhu et al., Experimental studies on electrical conductivity of the Dabie ultrahigh-pressure eclogites at high pressures and high temperatures, CH J GEO-CH, 44(1), 2001, pp. 93-102
Electrical conductivity is measured for dry and saturated with 1M NaCl eclo
gites at various pressures and temperatures, which are prevalent in the mid
and lower crust. The results show that the electrical conductivity of dry
eclogites parallel to the lineation is higher than that perpendicular to th
e lineation, however the activation energies are similar along both directi
ons. The conductivity of dry eclogites at conditions of the mid and lower c
rust is several orders of magnitude lower than that of average highly condu
ctive layers (HCL). At room temperature, the dependence of the conductivity
of saturated eclogites on pressure is different in directions parallel and
perpendicular to the lineation. The conductivity of saturated eclogites at
mid and lower crust conditions is in the range of values of average HCL. H
owever, the electrical conductivity of eclogites, regardless dry or satruat
ed, is even much lower than that of Dabieshan HCL at the depths between 20
and 50km beneath the surface, and therefore is not used to explain the gene
sis of this HCL. Thus eclogites are not the main rock type at such depths i
n Dabieshan area.