Electrical Conductivity Experimental Studies on the Dabie Ultrahigh‐Pressure Eclogites at High Pressures and High Temperatures

Abstract

AbstractElectrical conductivity is measured for dry and saturated with 1mol/L NaCl eclogites respectively 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 the lineation, however the activation energies along both directions are similar. The conductivity of dry eclogites at conditions relevant to the mid and lower crust is several orders of magnitude lower than that of average highly conductive layers (HCL). At room temperature, the conductivity of saturatede clogites is differently dependent on pressure 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. However, the electrical conductivity of eclogites, regardless of dry or saturated conditions, 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 genesis of this HCL. Thus eclogites are not the main rock type at such depths in Dabieshan area.