Layered Mantle Lithosphere in the Lac de Gras Area, Slave Craton: Composition, Structure and Origin

deeper layer contains 15-20% harzburgite and 80-85% lherzolite. garnet; trace elements; diamonds T estimates on eclogite xenoliths show that all were derived from the deeper layer. Xenolith data and garnet compositions indicate that the shallow layer is more magnesian ) than the deeper layer (Fo 91-92 ), and both layers are more olivine rich than South