Observations
- The mantle of the Slave is laterally heterogeneous in electrical conductivity
- 3-part E-W subdivision geophysically and geochemically
- Southern Slave is consistent with a deep asthenospheric boundary (200+ km)
- Beneath the Lac de Gras region the mantle is anomalously conductive, with a region of ណ W.m at a depth of 80-110 km. (Precludes definition of LAB in central Slave.)
- This anomalous region correlates spatially with an anomalous ultradepleted harzburgite layer